VV Cephei

Ask your questions, show your results
Post Reply
Jack Martin
Posts: 54
Joined: Fri Sep 11, 2015 10:31 am

VV Cephei

Post by Jack Martin »

I am trying to get a profile in ISIS when I press go error message-The vertical co-ordinate of the spectrum (y-value) is not valid- pops up what have I missed ?

Regards,

Jack UK
Olivier GARDE
Posts: 1243
Joined: Thu Sep 29, 2011 6:35 am
Location: Rhône Alpes FRANCE
Contact:

Re: VV Cephei

Post by Olivier GARDE »

Hi Jack,

It's difficult to answer your question without screen copy of ISIS screens ;-)
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Olivier Thizy
Posts: 370
Joined: Sat Sep 24, 2011 10:52 am
Location: in the french Alps...
Contact:

Re: VV Cephei

Post by Olivier Thizy »

Jack,


when you display your image of the spectrum of VV Cep in ISIS, check the "graticule" (ie: reticule) and verify you have the right Y position of your spectrum, the proper binning area (your spectrum must be all in this area and should not flow over but the area shouldn't be too large, and the background areas which should be correct as well.

Here is an exemple on ISIS screen:
Capture.JPG
Capture.JPG (89.66 KiB) Viewed 3937 times

Check out ISIS tutorial for your spectrograph:
http://www.astrosurf.com/buil/isis/guid ... to1_en.htm

See in particular the section that contains "Check "Graticuke", then press the "Binning zone adjusting"...


Cordialement,
Olivier Thizy
Jack Martin
Posts: 54
Joined: Fri Sep 11, 2015 10:31 am

Re: VV Cephei

Post by Jack Martin »

I followed your instructions but still having the same problem 2 pictures attached.
Regaards,
Jack UK
Attachments
Picture 002.png
Picture 002.png (427.44 KiB) Viewed 3921 times
Picture 001.png
Picture 001.png (263.65 KiB) Viewed 3921 times
Post Reply