Forum der Vereinigung der Sternfreunde

Hi all, attached is a new announcement for WR 140 from Tony Moffat.
Cheers, Thomas

Hello Thomas,
what are the the minimum requirements concerning R and S/N?
Regards Christian

Indeed, Christian, this is missing. S/N > 100 at R > 5000 are fine. I quote Tony Moffat: This time we don’t need quite as intense phase coverage, since we only want to see if the behaviour of CIII 5696 and HeI 5876 repeat from one cycle to the next. However, it’s always good to get as good coverage as the weather permits.
Cheers, Thomas

Hi Thomas,

As you have probably seen I have posted this new project to the SASER ring but realistically I think Paulo Cacella in Brasilia (-15 lat) is our only likely contributor.

Cheers,
Bernard

_________________
Quicquid Nitet Notandum

Yes, Bernard, I've seen it. But Paulo will probably be clouded out in winter, as he described it. Maybe our French colleagues will jump in.
Cheers, Thomas

Hi,

in the adnex you can see in a newly taken spectra of WR 140 an unusual small emssionline at ~5675,7 Angström.At least I have not seen yet this small line. I think this is not an artefact, but I cannot improve this. Further speks have to bee taken....

I cannot say what could be the reason of such phenomenon

berthold

Hi Berthold,

That's "just" a big clump in the wind. We see them frequently on this line.

Best regards,

Tony

-----Original Message-----
From: Berthold Stober
Sent: Thursday, August 18, 2016 9:00 AM
To: fg-spek-admin@vdsastro.de
Subject: [fg spektroskopie] Re: New campaign announcement

Link zum neuen Beitrag:
http://spektroskopieforum.vdsastro.de/v ... 451#p27993

Hi,

in the adnex you can see in a newly taken spectra of WR 140 an unusual
small emssionline at ~5675,7 Angström.At least I have not seen yet
this small line. I think this is not an artefact, but I cannot improve
this. Further speks have to bee taken....

I cannot say what could be the reason of such phenomenon

berthold


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_________________
Tony Moffat

Thank you Tony for quickly response.....I thought I had done a great detection

greetings also to your wife from me and Barbara

berthold

Hello Berthold,

Here is my result from the day before I do not see that particular bump but
I see other similar features (always moving from day to day)

Cheers
Robin

-----Original Message-----
From: Berthold Stober
Sent: Thursday, August 18, 2016 3:35 PM
To: fg-spek-admin@vdsastro.de
Subject: [fg spektroskopie] Re: New campaign announcement

Link zum neuen Beitrag:
http://spektroskopieforum.vdsastro.de/v ... 451#p27995

Thank you Tony for quickly response.....I thought I had done a great
detection

greetings also to your wife from me and Barbara

berthold

Hi Robin,

Nice to hear from you. Your S/N seems rather better than the demonstrated part of my spectrum. But the emission near the center of that CIV line is constantly to see. At least I see it on all spectra, I have looked.
How long was the exposure time in your case?
Cheers
Berthold

Hi Berthold,

The central emission line is from the O star. You can see it move relative
to the WR star line in this plot I made during the last periastron
http://www.threehillsobservatory.co.uk/ ... n_fast.gif

This is a first test of my current setup for the WR140 campaign (LHIRES 1200
35um slit C11). Yes it was a very long exposure. (10x600s), longer than I
will need in future. The SNR is very high, probably >500 per resolution
element measured in the pseudo continuum. Resolution is R~4500

Cheers
Robin

-----Original Message-----
From: Berthold Stober
Sent: Thursday, August 18, 2016 5:20 PM
To: fg-spek-admin@vdsastro.de
Subject: [fg spektroskopie] Re: New campaign announcement

Link zum neuen Beitrag:
http://spektroskopieforum.vdsastro.de/v ... 451#p27997

Hi Robin,

Nice to hear from you. Your S/N seems rather better than the
demonstrated part of my spectrum. But the emission near the center of
that CIV line is constantly to see. At least I see it on all spectra,
I have looked.
How long was the exposure time in your case?
Cheers
Berthold

Well, Berthold, it was still a great detection! It shows that everything is
working well.

Greetings also to Barbara from us both,

Tony

-----Original Message-----
From: Berthold Stober
Sent: Thursday, August 18, 2016 10:35 AM
To: fg-spek-admin@vdsastro.de
Subject: [fg spektroskopie] Re: New campaign announcement

Link zum neuen Beitrag:
http://spektroskopieforum.vdsastro.de/v ... 451#p27995

Thank you Tony for quickly response.....I thought I had done a great
detection

greetings also to your wife from me and Barbara

berthold


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_________________
Tony Moffat

Hi all,

I am a research associate at Ankara University, the Department of Astronomy and Space Sciences in Turkey. Our department has an observatory (http://rasathane.en.ankara.edu.tr/) outside of the city and we have conducted several scientific researches there. My supervisor Dr. Ian Stevens from the University of Birmingham informed me about your new campaign on WR140. In the observatory, we have a shelyak echelle spectrograph with a resolution between 12000 and 15000. It uses thorium-argon lamb for the calibrations. Me and my colleagues made a test observation for WR140 in the end of the August and derived three good spectra covering 4000-7000 A. If there is no obstacle, we would like to contribute your campaign. So, I would be grateful if you could tell what is needed.

Cheers,

Dr. Dogus Ozuyar

This is what we observed on 25.08.2018 in Ankara.

Hi,

ok this part of an echelle(?)- spektrum is ok. What instrument you used for taking this spectrum? How long was the exposure time, what the S/N?

What was the software you used for datareduction?

What was the date of the exposure?

Did you realize, that the "new compaigne" ask for spectra of WR140 in january or february 2017? At this time we cannot reach this star.

cheers
berthold

Hi,

last Friday I took the attached spectrum of WR140. It was a test for my objective grating setup (5cm*5cm 300L/mm Thorlabs grating, in front of a 60/330mm ED refractor). Due to the small aperture, I had to choose quite a long exposure time (in total, 67 * 2 minutes). I'm wondering if spectra of this quality could be of any use for your campain.
Resolution is about 4500 with a S/N of 140 (@5700Å, CIII-plateau, according to SpectroTools). Since the sky was a little bit hazy, I guess the S/N could be improved to some extent when observing at better conditions. In addition, a yellow filter should also help to further reduce the background.
Stacking was done using Astroart (together with hot pixel filtering and defect map correction), the linear wavelength calibration was made with RSpec. Because of the slitless mode operation, wavelength calibration first was performed on nearby star Sadr (Gamma Cygni). This calibration then was used to "fix" the Na-D line at 5890Å in the WR140 spectrum. In addition, an instrumental response correction had been applied (to get rid of the ripples introduced by the ICX694 camera chip - since I can't use flats in contrast to slit spectrographs...).

Cheers
Uwe

Hi,

We used a shelyak echelle spectrograph connected to a 40-cm telescope. The resolution was around 12000 with a S/N of 100. The exposure time was 2700 seconds. The data reduction was made by using the Audela software.


Cheers.

Dear Uwe,

Such a spectrum is quite useful for our campaign. However, if you can get
slightly higher S/N (c. 200 in the continuum), that would be better. In any
case, we might be able to bin a bit to enhance the S/N.

Please recall that the best time to get lots of spectra well distributed in
orbital phase is around periastron from about mid Nov through late January -
the worst time possible for a Cygnus object. This requires unusual effort,
but well worth it!

Cheers, Tony

-----Original Message-----
From: UweZurmühl
Sent: Sunday, October 2, 2016 5:21 PM
To: fg-spek-admin@vdsastro.de
Subject: [fg spektroskopie] Re: New campaign announcement

Link zum neuen Beitrag: http://forum.vdsastro.de/viewtopic.php?t=4451#p28142

Hi,

last Friday I took the attached spectrum of WR140. It was a test for my
objective grating setup (5cm*5cm 300L/mm Thorlabs grating, in front of
a 60/330mm ED refractor). Due to the small aperture, I had to choose
quite a long exposure time (in total, 67 * 2 minutes). I'm wondering if
spectra of this quality could be of any use for your campain.
Resolution is about 4500 with a S/N of 140 (@5700Å, CIII-plateau,
according to SpectroTools). Since the sky was a little bit hazy, I
guess the S/N could be improved to some extent when observing at better
conditions. In addition, a yellow filter should also help to further
reduce the background.
Stacking was done using Astroart (together with hot pixel filtering and
defect map correction), the linear wavelength calibration was made with
RSpec. Because of the slitless mode operation, wavelength calibration
first was performed on nearby star Sadr (Gamma Cygni). This calibration
then was used to "fix" the Na-D line at 5890Å in the WR140 spectrum.
In addition, an instrumental response correction had been applied (to
get rid of the ripples introduced by the ICX694 camera chip - since I
can't use flats in contrast to slit spectrographs...).

Cheers
Uwe


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_________________
Tony Moffat

Hello to all :

Martin Dubs has encouraged me to sign up to this conference, I was able to launch a Echelle, the MMUUd, and I participated in the campaign of observations of the WR140.

Enclosed is a graphic observations of days ago, are reduced to the IISS. Where should I send FITS?

I do not know if it is permissible to transfer a soft filter graphs for eleminar the noise, looked examples.
Friendly, Joan

Sorry, MMUUd is Mussol and IISS is ISIS.

Tanks, Joan.

Hello:

In the two photos, present the Mussol, placed in the telescope SC16, Eshel as the first module guide, which also contains the lights oh RELCO and tungsten, and a second part is the spectrograph, are united a multimode optical fiber, with a core of 50 microns.

Greetings, Joan.

Hello,

I don't know if this is the best place to introduce myself, but I write here encouraged by Thomas Eversberg in order to follow and share the results of the ongoing WR140 campaign.

Here is a spectrum taken the last night with a newtonian 8" and a DADOS slit-spectrograph, using a 1200 l/mm gratting and 25 um slit. Five exposures of 10 minutes averaged, calibrated with a RELCO lamp (6 lines) and the instrumental response corrected using HIP 99870 (A2 V) as comparison star.

I am sorry but I don't know how to calculate the S/N relationship I could increase the exposure (20 minutes/image) and I could use a Meade 12" in the future (now is on repair).

Also I am doing BVR photometry (Johnson-Cousins) of this star with a KAF 1603ME, but I still haven't reduced these observations because I'm undecided which comparison star should I choose. For my set-up the best candidate is HD 193632.
Greetings
Fran

P.S.: Salutacions, Joan. What an impressive set-up this Mussol!

Bon dia, Fran:

As always, a good spectrum. For the S / N can help you, http://www.astrosurf.com/buil/us/compute/compute.htm.

I also observed the WR140 in the same night. One cloud and I could only do four integrations 400 seconds.

Friendly, Joan.

Hello :

This is the aspect the WR140, in the night 2016 10 26.

Joan.

Hello to all :

A new graphics of WR140.

Regards, Joan.

A comparison between August and now. I estimate about 10-15 days before we
start to see any effect from the colliding winds.

Robin

-----Original Message-----
From: Joan Guarro Flo
Sent: Wednesday, November 02, 2016 10:09 PM
To: fg-spek-admin@vdsastro.de
Subject: [fg spektroskopie] Re: New campaign announcement

Link zum neuen Beitrag: http://forum.vdsastro.de/viewtopic.php?t=4451#p28319

Hello to all :

A new graphics of WR140.

Regards, Joan.


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A comparison between August and now. I estimate about 10-15 days before we
start to see any effect from the colliding winds.

Robin

Hallo:

Is the WR140 in de last night.

Regards, Joan.

Signs of excess emission on the blue edge of the CIII 5696 line tonight
Robin

Hi Robin,

Not too obvious, but could you compare your spectrum with an earlier one to
prove this? What about the HeI line?

Thanks, Tony

-----Original Message-----
From: Robin Leadbeater
Sent: Sunday, November 20, 2016 7:13 PM
To: fg-spek-admin@vdsastro.de
Subject: [fg spektroskopie] Re: New campaign announcement

Link zum neuen Beitrag: http://forum.vdsastro.de/viewtopic.php?t=4451#p28402

Signs of excess emission on the blue edge of the CIII 5696 line tonight



Robin

_________________
Tony Moffat

Hi Tony,

Yes a small change and probably marginally significant but outside the envelope of recent variability on that edge. (plotted in the WR frame)

I'll have a look at HeI too

Cheers
Robin

Nothing obvious on the HeI line
but the excess on the CIII line relative to pre periastron mean looks to be consistent with what we saw last time round at this phase
Cheers
Robin

It's probably hard to see any excess on the HeI line, due to its busy shape
from the WR component.
But it must be there, too, as seen before, although weaker than for CIII
5696.

Best

Tony

-----Original Message-----
From: Robin Leadbeater
Sent: Monday, November 21, 2016 12:40 PM
To: fg-spek-admin@vdsastro.de
Subject: [fg spektroskopie] Re: New campaign announcement

Link zum neuen Beitrag: http://forum.vdsastro.de/viewtopic.php?t=4451#p28406

Nothing obvious on the HeI line



but the excess on the CIII line relative to pre periastron mean looks
to be consistent with what we saw last time round at this phase



Cheers
Robin

_________________
Tony Moffat

Hi everybody,

I 'm new on this forum and I would like to participate to the WR140 campagne.

here's some spectra of my last observation with an eshel spectrograph (R=11000) and RC400 Telescope equip with an ATIK 460Ex CCD.

Hello,

this is a test I performed on last monday (JD 2457728.2707 - 2457728.3900) with a self-constructed assembly of a 600l/mm transmission grating, sandwiched by two 1o° prisms. This grating/prism array was operated in slitless mode in the converging beam of a 10" SCT (focal length with reducer: 1135mm).
The resolution is only moderate (about 3300 at Na-D), S/N about 300 in the continuum @5750Å (calculated from counting statistics per 0,72Å binning interval). Wavelength calibration was achieved by using ISM lines in this region. Total exposures: 80*2min.

Cheers, Uwe

Olivier, Uwe, that is great stuff.

To all!
For the ongoing campaigns with Tony Moffat and Noel Richardson (WR 140 in the North and gamma Vel in the South) we all agree that even a single spectrum contributed to these investigations will end in co-authorships!

In addition, in an email exchange with them Tony explicitely acknowledged the way how SASER (quote) „performs close cooperation whith pros for given targets data management, rather than making the data immediately public, so the pro’s idea can be easily stolen“.
Cheers, Thomas

Olivier,

Nice spectra.

Good to have you onboard.

Jack UK

Dear WR 140 aficionados!

Mike Corcoran (Goddard Space Flight Center - http://science.gsfc.nasa.gov/sed/bio/michael.f.corcoran) has started a WR 140 wiki (http://wr140.wikidot.com). He and Tony Moffat invite all the observing amateurs to contact them to ask to join the wiki. This invitation request joining the WR140 wiki is in a person-to-person basis. Every active WR 140 observer can send his or her name and email to Tony Moffat (moffat – (att) – umontreal.ca).

Cheers, Thomas

Hi,all,
after solving some problems reducing my spectra, here you are the results. I try to obtain the highest S/N possible,but even exposing 1200", due to the limited diametre of my scope (8") and especially the bad seeing, the S/N is not very high.

I'm going to send these results to Tony Moffat, if you believe they are OK.

Anyway, I have some photometric images waiting to be reduced but the AAVSO charts doesn't have good comparison stars. I have been considering HD 193888, HD 193926 or (better) HD 193632 as comparison stars, but I don't have enough information about their magnitudes in B, V and specially, Rc. That's the reason I stopped doing photometry but if necessary, I could resume these observations. Do you know where can I find all these magnitudes? I have been looking at SIMBAD database and there's information about B and V magnitudes, but nothing about Rc.

Greetings
Fran

WR140 CIII 5696A last night compared with pre periastron and near perisastron (plotted in WR star RV frame)

Cheers
Robin

Fran,

What is Rc ?

Regards,

Jack UK

Hi, Jack,

Rc means Cousins Rc filter. The complete Johnson-Cousins photometric system are U, B, V, Rc and Ic.

Greetings
Fran

Fran,

Thank you for clarifying that, have you tried contacting the AAVSO ?

Regards,

Jack

Huggins Spectroscopic Observatory UK

Hi, all

some days ago I tried to take a spectrum of WR 140. Clouds were nasty and they, together with the (still) short window of observation, only allowed me to take one single shot of 1200", but I have compared it with the first spectrum I took in October. I don't see differences, it seems that the "party" has finished.

Well, I could try to take another spectrum from some days now, when WR 140 will be a bit better placed!

Greetings
Fran

Yes, Fran, Periastron is obviously over. Thank you for your excellent work! Cherio, Thomas

Hi all! I want to take the opportunity to thank all contributing colleagues for their excellent work. Well done! Cheers, Thomas