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| BRITE satellites to monitor Cygnus https://forum.vdsastro.de/viewtopic.php?t=4163 |
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| Autor: | Noel Richardson [ 23. Mai 2014, 05:53:31 AM ] | ||
| Betreff des Beitrags: | BRITE satellites to monitor Cygnus | ||
Hi all, The massive star folks in Montreal are happy to announce that the BRITE nanosatellites will be obtaining continuous, millimag-precision photometry for about 6 months starting in the next few weeks. We would like to suggest an informal campaign to obtain high-quality spectra of two of the most luminous supergiants in the Galaxy simultaneous to the high-precision photometry. The stars are Deneb and P Cygni. I've attached a little write-up of the project below. Thank you for your help and support! Noel Richardson
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| Autor: | Alexandros Filothodoros [ 23. Mai 2014, 08:26:24 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hello would radio observations at 21cm be useful? Regards Alex |
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| Autor: | Berthold Stober [ 23. Mai 2014, 09:05:50 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
High Noel, I would be proud if I could deliver some echellespectra of these stars in upcoming summertime. Especially these stars are rather bright. So I should be able to deliver you some echellespectra between 4750 and 7000 Angström with an R of about 10.000. An S/N of 200 should be possible. Please tell me if you would accept this and tell me also please where i should upload these incomming spectra. cheers Berthold From: fg-spek-convento@vds-astro.de Sent: Friday, May 23, 2014 5:53 AM To: fg-spek-admin@vdsastro.de Subject: [fg spektroskopie] BRITE satellites to monitor Cygnus Link zum neuen Beitrag: http://spektroskopieforum.vdsastro.de/v ... 163#p25470 Hi all, The massive star folks in Montreal are happy to announce that the BRITE nanosatellites will be obtaining continuous, millimag-precision photometry for about 6 months starting in the next few weeks. We would like to suggest an informal campaign to obtain high-quality spectra of two of the most luminous supergiants in the Galaxy simultaneous to the high-precision photometry. The stars are Deneb and P Cygni. I've attached a little write-up of the project below. Thank you for your help and support! Noel Richardson |
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| Autor: | Robin Leadbeater [ 23. Mai 2014, 12:53:23 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Noel, Is it OK to cross post this to the ARAS group or do you prefer to keep it within the Convento community ? Cheers Robin |
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| Autor: | Noel Richardson [ 23. Mai 2014, 17:35:28 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi all, In answers to questions raised: I have no problem with this being cross posted with ARAS. Unfortunately, 21cm emission will probably not be detected for these stars. The stellar flux at that wavelength is essentially zero for all intents and purposes. A few stars have had their winds measured with radio, but I will have to look into if anything is there for these, but my memory of P Cygni is that the flux is too low at 21 cm. Lastly, for data transfer, I will get some ftp accounts set up in the next week or two. Then, I can assign them to people. If you are planning on participating, let me know, and we can do data transfer similarly to last year's WR campaign. Cheers, Noel |
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| Autor: | Filipe Dias [ 25. Mai 2014, 12:46:59 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
For the guys with a Lhires III and short wavelength range, what are the spectral regions of interest? |
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| Autor: | Robin Leadbeater [ 25. Mai 2014, 13:52:12 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Fil, According to Noel's document "For observers with an LHIRES spectrograph, we ask that you concentrate on H-‐alpha for both targets, and then obtain a spectrum of the Si II 6347-‐6371 lines for Deneb." Measuring RV of the Si II 6347-‐6371 lines could be tough though without telluric or IS markers given the (in)stabilty of the LHIRES if the variation is only ~5km/s pp as shown in fig 1. I might try superimposing lamp lines on the actual spectra during the exposure from my Filly lamp mounted at the telescope aperture. The Si II lines are nicely bracketed by strong neon lines. Cheers Robin |
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| Autor: | Filipe Dias [ 25. Mai 2014, 15:21:46 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Document?.. Ahhh!! I missed it (document in the forum and not as attachment on my email), sorry!! Thank you, Robin, with the added calibration advice! |
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| Autor: | Noel Richardson [ 10. Juni 2014, 19:38:46 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi all, Please email me if you are observing Deneb and P Cygni. I have ftp accounts at UdeM to drop data into. Thanks, Noel |
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| Autor: | Lothar Schanne [ 11. Juni 2014, 13:59:37 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hello Noel, I have a lot of older spectra of both stars. If you want them tell me your server connection data by PN or Email. |
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| Autor: | Robin Leadbeater [ 12. Juni 2014, 00:17:34 AM ] | ||
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus | ||
Hello Noel, I have just started monitoring the RV of Deneb using the S II lines. To get the required (+-1km/s?) precision using the LHIRES III I am superimposing calibration lamp lines using a lamp mounted at the edge of the telescope aperture and run during the exposures (see attached example) If these are suitable for you I can upload them. Cheers Robin
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| Autor: | Berthold Stober [ 12. Juni 2014, 08:55:53 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Robin, nice, indeed! My english is not so good, to express what ein I want to say respectivly to ask, but I'll try this nevertheless: I look your image on my IPad ! There I see the spectrum and the calibrationlines. These calibrationlines are not verticaly..I can move the spectrum along these lines and so I cannot get I high precision calibration!? Ok , ISIS or IRIS they all can (and have to) compensite (?) those tilt angles! Probably this could be the solution of this question! cheers Berthold |
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| Autor: | Filipe Dias [ 12. Juni 2014, 11:31:25 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Berthold, In IRIS, I use the following commands: For inspecting: L_ORI - (select a zone before) this checks the tilt angle of the spectrum, "horizontality" L_SLANT - (select a zone before) this checks the "slant" angle of the lines (locally), "verticality" For correcting: TILT <x0> <angle> - corrects non-horizontal dispersion axis (not needed for Robin's image) SLANT <y0> <angle> - corrects the angle of the lines at Y value of <y0> when doing 2D spectra, I use SMILE for un-curving the lines into straight lines. Not needed for stellar spectroscopy So for Robin's data, it is enough to use SLANT command. <y0> should have the vertical Y position of the spectrum, and <angle> should be the angle that you get from executing L_SLANT on the line you want. We should not worry about this for the data sent to Noel, though! |
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| Autor: | Robin Leadbeater [ 12. Juni 2014, 11:39:43 AM ] | ||
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus | ||
Hello Berthold, The lamp lines are tilted/curved because of the spectrograph geometry. The star spectrum will also move in the X direction the same way if the spectrum is moved up or down. This means that where the lamp lines cross the star spectrum, the wavelengths will always be the same even if the star spectrum is moved up or down. You reduce them in exactly the same way with geometric corrections etc but you produce 2 spectra, one as normal with the background subtracted (which removes the lamp lines) and one without background subtraction which is used for calibration. (Actually in this case because we are only interested in the wavelength of the star absorption lines and the lamp lines do not interfere with them, we can just reduce the spectrum without background subtraction, calibrate it directly using the lamp emission lines and then measure the wavelength of the S II lines on the same profile. See attached example spectrum profile.) Cheers Robin
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| Autor: | Robin Leadbeater [ 12. Juni 2014, 11:49:01 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Note that it is important that the lamp is kept in the same position in front of the telescope and for best accuracy it should be in line with the slit. This is because the line will move slightly with the position of the lamp. See Lothar's study of this for example http://www.astrospectroscopy.eu/Einstei ... rung_e.htm Even so there will be small differences in absolute wavelength calibration between observers so an RV standard should also be measured occasionally by each observer to correct for any offsets. (Can you suggest one Noel?) Cheers Robin |
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| Autor: | Robin Leadbeater [ 01. Juli 2014, 15:08:29 PM ] | ||
| Betreff des Beitrags: | BRITE campaign - Deneb RV | ||
Attached are initial RV data for Deneb measured at THO. The RV variations in the SiII lines are clear. (4.5km/s range, mean -1km/s to date. The week gap is due to a holiday). An RV precision better than 1km/s has been achieved using the LHIRES III and simultaneous recording of a calibration lamp mounted at the telescope aperture. The precision is estimated from measurements of Vega as an RV standard. Does anyone have a reliable absolute RV figure for Vega? The figure of -20.6 km/s given in Simbad does not appear to be correct. My mean is -12.1 km/s, compared with -12.9 km/s measured by me on a spectrum taken from the ELODIE archive and -13.9 +-0.9 km/s from this reference http://adsabs.harvard.edu/abs/1967IAUS...30...57E Cheers Robin
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| Autor: | Berthold Stober [ 01. Juli 2014, 18:00:19 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Robin, I found a RV from alpha cygni at 18.940/06/214 -3.85km/sec using the Si line 6347.1 Angström and -4.36km/sec using Si 6371.36. These values seems to be realisitic to me. From vega I have no spectra, so I cannot messure the RV from this star. Which line one could use for this on a Vega spectrum? cheers berthold |
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| Autor: | Robin Leadbeater [ 01. Juli 2014, 19:00:44 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Berthold, I used the same Si II lines to measure Vega RV (They are not as strong as in Deneb but still very clear) I think it is is good idea to measure a standard star occasionally because there could be small wavelength calibration offsets between different instruments. Cheers Robin |
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| Autor: | Christian Netzel [ 01. Juli 2014, 19:07:26 PM ] |
| Betreff des Beitrags: | Re: BRITE campaign - Deneb RV |
Zitat:
Does anyone have a reliable absolute RV figure for Vega? The figure of -20.6 km/s given in Simbad does not appear to be correct. My mean is -12.1 km/s, compared with -12.9 km/s measured by me on a spectrum taken from the ELODIE archive and -13.9 +-0.9 km/s from this reference
Hello Robin,http://adsabs.harvard.edu/abs/1967IAUS...30...57E Cheers Robin vega has an extremely fast rotation velocity. This might be the reason why it difficult to get exact values for the radial velocities. May be you should choose a different star for calibration. http://en.wikipedia.org/wiki/Vega Cheers Christian |
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| Autor: | Berthold Stober [ 01. Juli 2014, 19:47:36 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hello Robin, yes, I'll try to get some spectra of vega. Perhaps the Si lines of Vega are not so enlarged caused by high rotation speed like the hydrogen or helium lines. I don't know if it is possible , that such differentes could exist. Cheers Berthold |
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| Autor: | Robin Leadbeater [ 01. Juli 2014, 20:28:29 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hello Christian, Berthold, Yes Vega is a fast rotator but we see it pole on so V sin (i) is very low. The Si II line profiles are very similar in width to those of Deneb so I do not think there is any fundamental problem making the RV measurement. (My results for Vega are very stable over the survey so far, with only 0.5 km/s standard deviation which is excellent for the LHIRES.) I have now found some more references for Vega RV which agree with the 13.9 km/s figure (and close to my figure of 12.1km/s) so I think the 20.6 km/s reference figure used by SIMBAD is probably in error. It is important though that we have an agreed RV standard for the Si II line measurements otherwise it will be more difficult to bring the results from different observers to the same baseline. (This is not a problem for H alpha because the telluric lines can be used to check the calibration) I requested an RV standard in a previous post but none was suggested which is why I decided to go ahead using Vega. Cheers Robin |
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| Autor: | Berthold Stober [ 01. Juli 2014, 21:20:18 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Noel, I am observing deneb and pcygni since june 2014 in every clear night. cheers berthold |
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| Autor: | Berthold Stober [ 01. Juli 2014, 22:09:48 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Robin, I found some spectra of vega from 18.838/06/2014 (JD2456827.3381). And I see the SI lines rather (unexspected!)small and sharp. But I have problems with computing the RV in this case. I found a heliocntric correction of 2.74 km/s for this date. I found a RV using the 6371.36 of 15.538 km/s; using 6347.1 I found 17.49km/s. But all values are positiv  My mesured differences ( delta lambda!)are for 6347.1 0.37 and for 6371.36 0.33....Could you please find out , what could be wrong here? I thought the RV should be negativ? cheers berthold |
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| Autor: | Robin Leadbeater [ 02. Juli 2014, 00:19:30 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
For the same date and time (20140618.9) I get for Vega: Uncorrected wavelengths 6346.755 6371.025 A uncorrected delta lambda -0.345 -0.335 A heliocentric correction 4.5 km/s corrected RV -11.81 -11.27 km/s mean RV -11.5 km/s Observatory location 3.24W 54.75N Robin |
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| Autor: | Berthold Stober [ 02. Juli 2014, 06:54:03 AM ] |
| Betreff des Beitrags: | Re: Re: BRITE satellites to monitor Cygnus |
How is the convention? When the values of delta lambda are positive and when there are negative? I computed the HC with Vspec. I am wondering about the differences..... Cheers Berthold Zitat: Am 02.07.2014 um 00:19 schrieb Robin Leadbeater :
Link zum neuen Beitrag: http://spektroskopieforum.vdsastro.de/v ... 163#p25661 For the same date and time (20140618.9) I get for Vega: Uncorrected wavelengths 6346.755 6371.025 A uncorrected delta lambda -0.345 -0.335 A heliocentric correction 4.5 km/s corrected RV -11.81 -11.27 km/s mean RV -11.5 km/s Observatory location 3.24W 54.75N Robin |
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| Autor: | Berthold Stober [ 02. Juli 2014, 08:44:25 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Robin, I mesured and calculated once more. Now , now I found the same HC as you......  And I guess that we have a negative RV if the lines are shifted to shorter wavelength. Is it correct? So I find out at 6347,10 a RV of -12.99km/s at Vega for the 18.838/06/14. But to determinate the line center with VSPEC ist rather tricky. I realize a big scattering. Perhaps I should use midas to mesure the line center. But this is rather laborious  cheers berthold (the next time I am here would be the 4.7.14) |
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| Autor: | Noel Richardson [ 02. Juli 2014, 22:53:48 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi all, It sounds as if people are making some real progress observing and making meaningful measurements. Thank you to everyone. I have some ftp accounts for you to send data to. Please email me (richardson_at_astro_dot_umontreal_dot_ca) and I will give you an account. Thanks again, glad everyone is having good luck thus far. Clear skies, Noel |
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| Autor: | Robin Leadbeater [ 13. Juli 2014, 15:53:51 PM ] | ||
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus | ||
Latest Deneb RV data attached. The quasi-periodic pulsations are clear (currently ~ 12.5 days period ~6 km/s pp). RV Precision is ~0.5km/s sigma based on measurements of Vega but there is probably a small +1-2 km/s systematic error based on an initial comparison of lamp and solar spectra (to be confirmed). Robin
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| Autor: | Berthold Stober [ 13. Juli 2014, 17:02:26 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Nice Robin, the sky here is always cloudy...... cheers Berthold |
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| Autor: | Robin Leadbeater [ 29. August 2014, 16:02:09 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Now 80 days into the observing run on Deneb here at THO. Mean cadence has been just under 2 days (mainly weather related). I am now monitoring H alpha as well as the Si lines for RV. The run of periodic RV variations has ceased and the trend now appears chaotic. Variations in the H alpha line are subtle but easily detectable day to day (mainly in the blue absorption edge so far) Repeatedly changing wavelengths on the LHIRES III between Ha and Si has not increased the RV scatter but a ~1.5km/s shift was seen after remounting the calibration lamp (easily detected in the Vega reference checks so can be compensated for) If measuring the RV from the Si lines, note there are some weak tellurics in this area which should probably be removed for best precision (to be done on a second pass calibration of the THO data). The longer wavelength line of the pair of Si lines also slightly overlaps a weak line on the blue side (at my R ~17000 resolution at least) which probably should be deblended properly before measurement (I have not attempted this yet). I have not identified the line but interestingly it does not appear in the Vega spectrum Cheers Robin edited 31-8-2014 to R value typo |
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| Autor: | Noel Richardson [ 29. August 2014, 20:18:33 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Robin, Great work! The weak blended absorption line is an Fe II line. It is pretty weak, but we should take it into account during the final measurements. Thanks, and again, great work! Noel |
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| Autor: | Jack Martin [ 14. September 2014, 13:16:17 PM ] | ||
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus | ||
[attachment=0]deneb-14-09-09-013i.jpg[/attachment]Noel, I took 2 spectra of the H alpha line approximately 24 hrs apart which has changed from an absorption line to a P Cygni profile. Unfortunately I cannot upload the images because I don't understand German perhaps somone can explain how to do this. I am gathering lots of data for Brite project. Regards, Jack Huggins Spectroscopic Observatory
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| Autor: | Jack Martin [ 14. September 2014, 13:28:52 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Trying to get the hang of this. Jack Huggins Spectroscopic Observatory |
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| Autor: | Jack Martin [ 14. September 2014, 13:33:13 PM ] | ||
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus | ||
Trying again with second image. Jack Huggins Spectroscopic Observatory
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| Autor: | Robin Leadbeater [ 14. September 2014, 14:11:28 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Jack, All my recent Deneb spectra are showing some emission though there is a strong water line in this area at the moment which makes it less obvious. Your second spectrum looks like Deneb but the first spectrum is of a different star (It looks more like Vega) Cheers Robin |
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| Autor: | John Strachan [ 14. September 2014, 15:28:02 PM ] |
| Betreff des Beitrags: | RE: Re: BRITE satellites to monitor Cygnus |
Hi jack, Am in france now till 28th. Have very limited internet due to mobile wifi problems will not be able to respond to emails in a likelihood till i get back. Good luck with the deneb spectra john > To: fg-spek-admin@vdsastro.de > Subject: [fg spektroskopie] Re: BRITE satellites to monitor Cygnus > Date: Sun, 14 Sep 2014 13:33:13 +0200 > From: fg-spek-convento@vds-astro.de > > Link zum neuen Beitrag: http://spektroskopieforum.vdsastro.de/v ... 163#p25803 > > Trying again with second image. > > Jack > > Huggins Spectroscopic Observatory > |
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| Autor: | Robin Leadbeater [ 14. September 2014, 16:48:42 PM ] | ||
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus | ||
Jack, Here is my Deneb H alpha for 20140909 (Tellurics removed, heliocentric) Robin
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| Autor: | Jack Martin [ 16. September 2014, 21:37:51 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Robin, Thanks for the guidance clearly that was the wrong star. Don't know what went wrong. I am using a Paramount MX that needs some fine tuning monitoring the H Alpha line as advised by John Having difficulty with understanding how to upload would like to post a picture avatar is there an English version of tabs available? Regards, Jack |
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| Autor: | Thomas Eversberg [ 17. September 2014, 09:07:30 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Jack! Zitat: Having difficulty with understanding how to upload would like to post a picture avatar is there an English version of tabs available?
With "tabs" you mean the categories, right? They are bilingual (German | English). The language preferences can be adjusted in the "User Control Panel" which you can find in the upper left corner after login.Your avatear can be implemented there, as well ("edit avatar"). Cheers, Thomas |
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| Autor: | Jack Martin [ 18. September 2014, 10:34:46 AM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Thomas, Thank you for your help. Jack Director Huggins Spectroscopic Observatory |
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| Autor: | Ulrich Waldschlaeger [ 23. Oktober 2014, 23:06:29 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Zitat: Hi all,
Hi Noel,The massive star folks in Montreal are happy to announce that the BRITE nanosatellites will be obtaining continuous, millimag-precision photometry for about 6 months starting in the next few weeks. We would like to suggest an informal campaign to obtain high-quality spectra of two of the most luminous supergiants in the Galaxy simultaneous to the high-precision photometry. The stars are Deneb and P Cygni. I've attached a little write-up of the project below. Thank you for your help and support! Noel Richardson there is an impressive collection of Halpha profiles in your project description BRITE_Cygnus.pdf, which is not part of the paper http://iopscience.iop.org/1538-3881/141/4/120/article you mentioned there. It would be interesting to compare these profiles with activities we observed here in the same region in the last weeks. Is there any related paper to these profiles or a higher resolution image from the same picture available? Thanks, Ulrich |
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| Autor: | Ulrich Waldschlaeger [ 24. Oktober 2014, 21:11:24 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
found: http://iopscience.iop.org/1538-3881/141 ... 1_1_17.pdf Regards Ulrich |
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| Autor: | Robin Leadbeater [ 08. November 2016, 19:24:25 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
These observations of Deneb were made over 2 years ago now. Did anything come of this work? Are there any publications planned? Thanks Robin |
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| Autor: | Jack Martin [ 15. November 2016, 22:30:40 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Robin, I am also wondering what has happened to all the data of Deneb 1885 spectra I contributed which amounts to many hours of telescope time. I e mailed Noel last week but no response so far. Lets hope we hear something positive soon. Regards, Jack UK |
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| Autor: | Christian Netzel [ 16. November 2016, 15:28:50 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Jack, we are a group of austrian and german amateurs who observe Deneb since three years. We intend to continue our program. Could you give us some information about spectral range and R value of your Deneb spectra? Regards Christian |
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| Autor: | Robin Leadbeater [ 16. November 2016, 17:38:02 PM ] |
| Betreff des Beitrags: | Re: Re: BRITE satellites to monitor Cygnus |
Hi Christian, I also have a number of Deneb spectra taken in support of the BRITE campaign 2014. (Spectra of Si lines for high precision RV measurement and also some covering H alpha) If there are no plans to publish the results of this specific campaign, I will be uploading them to the new BAA spectroscopy database https://www.britastro.org/node/8273 and you are welcome to combine them with your data subject to the rules of the database. Cheers Robin -----Original Message----- From: Christian Netzel Sent: Wednesday, November 16, 2016 1:28 PM To: fg-spek-admin@vdsastro.de Subject: [fg spektroskopie] Re: BRITE satellites to monitor Cygnus Link zum neuen Beitrag: http://forum.vdsastro.de/viewtopic.php?t=4163#p28375 Hi Jack, we are a group of austrian and german amateurs who observe Deneb since three years. We intend to continue our program. Could you give us some information about spectral range and R value of your Deneb spectra? Regards Christian --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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| Autor: | Christian Netzel [ 17. November 2016, 13:51:54 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Hi Robin, I appreciate your kind offer. However we prefer to leave the door open for a future paper. Cheers Christian |
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| Autor: | Jack Martin [ 17. November 2016, 23:24:41 PM ] |
| Betreff des Beitrags: | Re: BRITE satellites to monitor Cygnus |
Christian, Spectral range H alpha line. R around 17000 with a LHIRES III 2400 l / mm grating, C14, Atik 314 mono. Regards, Jack Huggins Spectroscopic Observatory UK |
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