Forum der Vereinigung der Sternfreunde :: reading fits files from the STELLA spectrograph

Forum der Vereinigung der Sternfreunde https://forum.vdsastro.de/

reading fits files from the STELLA spectrograph https://forum.vdsastro.de/viewtopic.php?t=3469	Seite 1 von 1

Autor:	Robin Leadbeater [ 19. Januar 2011, 13:48:10 PM ]
Betreff des Beitrags:	reading fits files from the STELLA spectrograph
I have some fits files from the STELLA echelle spectrograph http://www.aip.de/stella/index.php?id=summary but I cannot read them with any of the software I have. (fv,SPLAT,specview,Vspec,Rlhires) Is there anyone who can help? Thanks Robin

Autor:	Lothar Schanne [ 19. Januar 2011, 14:08:34 PM ]
Betreff des Beitrags:
Hello Robin, can yo mail me such a file? l.schanne....ät...arcor.de

Autor:	Otmar Stahl [ 19. Januar 2011, 14:40:06 PM ]
Betreff des Beitrags:	reading fits files from the STELLA spectrograph
Hi Robin, On 01/19/2011 12:48 PM, Robin Leadbeater wrote: Zitat: I have some fits files from the STELLA echelle spectrograph http://www.aip.de/stella/index.php?id=summary but I cannot read them with any of the software I have. (fv,SPLAT,specview,Vspec,Rlhires) Is there anyone who can help? This is difficult, since you did not supply much information Is there an error message, when you open the file in fv? You could try to use the fits verify program available from: http://fits.gsfc.nasa.gov/fits_verify.html If this does not help, could you make one of the files available? Since the files are probably large, you could e.g. use yousendit or a similar service. Zitat: Thanks Robin Best regards, Otmar

Autor:	TorstenHansen [ 19. Januar 2011, 17:25:36 PM ]
Betreff des Beitrags:	Re: reading fits files from the STELLA spectrograph
Hi Robin, Zitat: I have some fits files from the STELLA echelle spectrograph http://www.aip.de/stella/index.php?id=summary but I cannot read them with any of the software I have. (fv,SPLAT,specview,Vspec,Rlhires) Is there anyone who can help? Thanks Robin Maybe fitswork can open it: http://www.fitswork.de/software/softw_en.php Cheers, Torsten

Autor:	Robin Leadbeater [ 19. Januar 2011, 17:46:50 PM ]
Betreff des Beitrags:
Hi Torsten, I had not seen that program before so I tried it but it expects the fits file to be an image, not data so it tries to convert the 82 wavelength calibrated echelle order spectra into an image. A very interesting effect but no quite what I need I have sent Lothar an example of the file. Perhaps he can work out how to view the data Cheers Robin

Autor:	Otmar Stahl [ 19. Januar 2011, 17:52:23 PM ]
Betreff des Beitrags:	reading fits files from the STELLA spectrograph
Hello Robin, On 01/19/2011 04:46 PM, Robin Leadbeater wrote: Zitat: Hi Torsten, I had not seen that program before so I tried it but it expects the fits file to be an image, not data so it tries to convert the 82 wavelength calibrated echelle order spectra into an image. A very interesting effect but no quite what I need. Ok. I think I understand. These are reduced data? So it is likely that these are FITS-tables, not images. which many FITS-readers cannot handle. Zitat: I have sent Lothar an example of the file. Perhaps he can work out how to view the data. Lothar, if you cannot handle the data, I can try Zitat: Cheers Robin Best regards, Otmar

Autor:	Lothar Schanne [ 19. Januar 2011, 17:59:35 PM ]
Betreff des Beitrags:
Zitat: I have sent Lothar an example of the file. Perhaps he can work out how to view the data Thank You Robin, some time later, in the evening, when I will be at home, I will try.

Autor:

Lothar Schanne [ 19. Januar 2011, 20:10:57 PM ]

Betreff des Beitrags:

Hello Robin,

with MIDAS there is no problem to read and to work with that file.
It's the spectrum of eps Aur.
See annex.

It's a echelle spectrum, no calibration. 2043 Pixels and 83 orders. All details in the header.

You can also open the file with
fv: FITS Viewer and Editor (version 5.2.1)
and see the file, its header and the 83 orders.

Dateianhänge:

RobinsFile.gif [ 33.45 KiB | 4407 mal betrachtet ]

Autor:

Lothar Schanne [ 19. Januar 2011, 23:36:52 PM ]

Betreff des Beitrags:

Hallo,
muß mich korrigieren.
Im header des files steht für jede Ordnung die Anfangswellenlänge drin und die Dispersion (A/pix). Also lassen sich die Spektren auch in kalibrierter Form darstellen.
spec23 = "23 8' WAT2_103= '7 2 6500.7926287096 0.041059415680497 2043 0. 725.91 730.59 0.966365'........

Das Spektrum ist unten zu sehen (Halpha-Linie), in nicht kalibrierter Form. Aber die Kalibrierung ist aus den Angaben rekonstruierbar (und mit dem richtigen MIDAS-Befehl wahrscheinlich auch direkt darstellbar).

Dateianhänge:

order23.gif [ 29.41 KiB | 4383 mal betrachtet ]

Autor:	Robin Leadbeater [ 20. Januar 2011, 01:16:11 AM ]
Betreff des Beitrags:
Ah, now we are making progress. But what are the other numbers for each order in the header? Also the file has three layers, not just the flux What are the other layers? Also why is the blaze still in the spectrum and how can I remove it without a flat? I think I need to go back to the STELLA team for more help and get a definition for the file. Thanks for your help Robin

Autor:	Lothar Schanne [ 20. Januar 2011, 15:29:39 PM ]
Betreff des Beitrags:
Zitat: But what are the other numbers for each order in the header? Also the file has three layers, not just the flux What are the other layers? Also why is the blaze still in the spectrum and how can I remove it without a flat? I think I need to go back to the STELLA team for more help and get a definition for the file. Hello Robin, Otmar has made a script for the reading and extraktion of the normalized spectra of all orders. Flats and so on, the complete data reduction procedure is made in the data. Also the normalized spectra are written in. The Midas procedure of otmar is running on my laptop and gives the orders spectra (calibrated and calibrated + normalized) as fits. Very fine script. Are you able to run MIDAS? If not, then I can reduce the spectra for you. The 83 spectra, extracted of your file, I will send you by E-mail.

Autor:	Robin Leadbeater [ 20. Januar 2011, 15:56:06 PM ]
Betreff des Beitrags:
Zitat: Hello Robin, Otmar has made a script for the reading and extraktion of the normalized spectra of all orders. Flats and so on, the complete data reduction procedure is made in the data. Also the normalized spectra are written in. The Midas procedure of otmar is running on my laptop and gives the orders spectra (calibrated and calibrated + normalized) as fits. Very fine script. Are you able to run MIDAS? If not, then I can reduce the spectra for you. The 83 spectra, extracted of your file, I will send you by E-mail. Wow!! that is fantastic. Thank you so much Lothar and Otmar. I do have MIDAS (on the astrolinux disc) but I have not used it. Now will be a good time for to learn. Best Wishes Robin

Autor:	Lothar Schanne [ 20. Januar 2011, 16:42:36 PM ]
Betreff des Beitrags:
Zitat: I do have MIDAS (on the astrolinux disc) but I have not used it. Now will be a good time for to learn. Hello Robin, I contact You by E-mail because the bilateral character of that story.

Seite 1 von 1	Alle Zeiten sind UTC+02:00
Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/