HD 203024 H-alpha émission

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umberto sollecchia
Posts: 242
Joined: Tue Dec 30, 2014 3:25 pm

HD 203024 H-alpha émission

Post by umberto sollecchia »

Bonjour,je informe que le H-alpha de cette étoile, de l'absorption est devenue émission.
Je joins une comparaison.Quelqu'un peut confirmer?
Comparazione hd203024.png
Comparazione hd203024.png (9.57 KiB) Viewed 6376 times
Cordialement Umberto
Mike Potter
Posts: 32
Joined: Sat Jan 05, 2013 9:39 am
Location: Baltimore, MD
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Re: HD 203024 H-alpha émission

Post by Mike Potter »

This is not an ideal setup for a star so faint - but I had the time and did not want to change the configuration - LHiRes 1800 - 23u - 5400 seconds. Unless I got the wrong star, it appears there is no emission.

Mike Potter
Beverly Hills Observatory
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umberto sollecchia
Posts: 242
Joined: Tue Dec 30, 2014 3:25 pm

Re: HD 203024 H-alpha émission

Post by umberto sollecchia »

Merci beaucoup Mike pour votre observation.
Dès que je peux, encore observer cette étoile
Cordialement Umberto
umberto sollecchia
Posts: 242
Joined: Tue Dec 30, 2014 3:25 pm

Re: HD 203024 H-alpha émission

Post by umberto sollecchia »

Mike Salut, merci pour votre coopération. Je regardai de nouveau l'étoile.
Confermo H-alpha absorption.
Il y a eu un échange de fichiers dans le processus de réduction de données.
Placez la comparaison exacte.
Comparazione hd203024.png
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Cordialemente Umberto
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: HD 203024 H-alpha émission

Post by Paolo Berardi »

Hi Umberto, Mike,

there is a faint emission component in the large photospheric absorption also in my spectrum of 6 december (Lhires III 1200), a feature similar to what we can see on the recent Mike's profile. No hint of emission component is visible in previous mid-res spectra on BeSS. This could indicate that an activity phase has began. So, the Umberto early reporting, even if not appropriate, was useful anyway! ;)

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Paolo
Mike Potter
Posts: 32
Joined: Sat Jan 05, 2013 9:39 am
Location: Baltimore, MD
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Re: HD 203024 H-alpha émission

Post by Mike Potter »

Hi Umberto:

Ha! In fact, I had noticed that possible emission feature but was uncertain due to the somewhat ratty S/N, so the following night I went back to the star and tried another - ironically enough exposing almost the exact same time as yours. Indeed the feature is real.

Mike
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