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WR137 bande CIII & CIV

Posted: Sun Jun 07, 2015 5:41 pm
by Olivier GARDE
Here's a spectrum of WR 137 taken 2 nights ago with eshel spectrograph (R=11000) : 1 hour total exposure (6 exposures of 10 minutes each)

I took two spectra with 3 hours interval to see if there were significant changes on CIII and CIV lines of the spectrum.

With 3 hours interval, I can not see main changes in CIII for example, there has some smalls differences, but this is noise or a real change ?

In the coming days I will try to achieve other spectra.

Voici un spectre de WR 137 réalisé dans la nuit de jeudi à vendredi avec le spectro eshel (R=11000) : 1 heure de pose totale (6 poses individuelles de 10 minutes chacune)
J'ai pris 2 spectres à 3 heures d'interval pour voir s'il y avait des changements significatifs sur les bande CIII et CIV du spectre.

Avec 3 heures d'interval on ne peut pas voir grand chose dans ce qui se passe dans CIII par exemple, il y a certe quelques différences, mais est ce du bruit ou une réelle évolution ?

Dans les prochains jour j'essayerai de réaliser d'autres spectres pour les comparer.

Image

Re: WR137 bande CIII & CIV

Posted: Sun Jun 07, 2015 8:09 pm
by Robin Leadbeater
Hello Olivier,

The changes are probably real. They are produced by variations in the stellar wind.
They have been studied in Pro Am projects in the Convento group.
http://www.stsci.de/convento/
http://www.stsci.de/wr134/index.htm
Here is an example of the effects in WR134 measured in 2013
http://www.astro.umontreal.ca/~emily/CA ... er2015.pdf
WR137 was also measured in the same campaign. I will post some of the spectra I measured for comparison.

Cheers
Robin

EDIT:-

My measurements of WR137 in 2013 are now attached

Robin

Re: WR137 bande CIII & CIV

Posted: Sun Jun 07, 2015 9:01 pm
by Robin Leadbeater
Some more measurements of WR137 from 2012
http://spektroskopieforum.vdsastro.de/v ... =32&t=3878

Robin

Re: WR137 bande CIII & CIV

Posted: Mon Jun 08, 2015 9:44 am
by Olivier GARDE
Hello Robin,

Thank you very much for this useful information.