Alpha Camelopardalis

Show your spectra, your results ...

Alpha Camelopardalis

Postby jsandse » Wed Oct 05, 2011 11:30 am

Hi all,
I am going to try and monitor activity on Alpha Camelopardalis over next couple of weeks.
The scientific papers state that this star is very active and I should be able to see profile changes every day
Just wandered if anyone out there has ever studied/observed this star.

My first spectra from last night is attached.

cheers

John
Attachments
alpha_camelopardalis_20111004_884.png
Alpha Camelopardalis at H alpha
alpha_camelopardalis_20111004_884.png (5.82 KiB) Viewed 5115 times
jsandse
 
Posts: 10
Joined: Wed Oct 05, 2011 11:10 am

Re: Alpha Camelopardalis

Postby Olivier Thizy » Wed Oct 05, 2011 12:03 pm

John,

this seems an interesting project. De the papers mention which resolving power would be required to see such short-time changes ?

Cordialement,
Olivier Thizy
Vous ne verrez plus des étoiles comme avant !
http://www.shelyak.com/en/
Olivier Thizy
 
Posts: 370
Joined: Sat Sep 24, 2011 10:52 am
Location: in the french Alps...

Re: Alpha Camelopardalis

Postby jsandse » Wed Oct 05, 2011 12:40 pm

Paper I was reading was Markova 2002.
The resolution of the spectra taken was 15000 for one set of spectra and 22000 for the other. SNR varied from 50 to 275 for the spectra.

cheers

John
jsandse
 
Posts: 10
Joined: Wed Oct 05, 2011 11:10 am

Re: Alpha Camelopardalis

Postby jsandse » Thu Oct 06, 2011 2:00 pm

Ok first comparison of Alpha Cam from two nights ago in blue and last night in pink.

Quite a few noticeable differences...
Attachments
AlphaCamComparison.GIF
AlphaCamComparison.GIF (8.51 KiB) Viewed 5093 times
jsandse
 
Posts: 10
Joined: Wed Oct 05, 2011 11:10 am

Re: Alpha Camelopardalis

Postby Thierry Garrel » Thu Oct 06, 2011 4:56 pm

Hi John,
i'm happy that your guest has leaved. So now you're on the right time for gathering spectra during bad weather ;)
Alp Cam seems not to move between your two spectra. What are the narrow peaks you have above the continuum ? Cosmic or Real ?
Amitiés
thierry
Ps:planning a rendez vous one of these night ?
Thierry Garrel
 
Posts: 189
Joined: Mon Sep 26, 2011 2:52 pm
Location: Montpellier

Re: Alpha Camelopardalis

Postby jsandse » Thu Oct 13, 2011 5:02 pm

Preliminary results of my study of Alpha Cam over the last week.
Diagram shows changes in the broad Halpha emission line over 5 nights. The line shape changes from being symmetric to being asymmetric.

I now want to learn how to remove cosmics and tellurics as there are a few of these in the spectra - anyone got any comments on best way of doing this.

cheers

John
Attachments
alphacamcomparison5.GIF
jsandse
 
Posts: 10
Joined: Wed Oct 05, 2011 11:10 am

Re: Alpha Camelopardalis

Postby Valerie Desnoux » Sun Oct 16, 2011 8:43 am

Hi
To remove cosmic, it has first to be done during image processing. But if one or two "outliers" remains and if you're using Vspec, you can:
- menu: edit>pixel... see the manual for how to edit the pixel you want
or
- select the region where you have the pixel, try to make it small to not "erase" too much profile, go menu: operations>interpole zone. A new profile is created, if it is ok, then move it as your intensity profile with the use of the button: replace

Valerie
Valerie Desnoux
 
Posts: 96
Joined: Wed Sep 28, 2011 4:52 am

Re: Alpha Camelopardalis

Postby jsandse » Sun Oct 16, 2011 3:30 pm

Thanks for the advice Valerie.

I'll try both suggestions to see which works best.

I have also been experimenting with removing the telluric lines using VSpec

Will post results up once I finally get all the processing done on the spectra

cheers

John
jsandse
 
Posts: 10
Joined: Wed Oct 05, 2011 11:10 am

Re: Alpha Camelopardalis

Postby jsandse » Tue Oct 18, 2011 1:40 am

Another picture this time showing two spectra from 4th Oct in blue and 17th Oct in red of the pretty dramatic changes in the Halpha line of Alpha Cam.

Cheers

John
Attachments
alphacamcomparison4thand17thOct.GIF
alphacamcomparison4thand17thOct.GIF (25.78 KiB) Viewed 5050 times
jsandse
 
Posts: 10
Joined: Wed Oct 05, 2011 11:10 am


Return to Spectra, results, information on activity ...

Who is online

Users browsing this forum: No registered users and 1 guest

x