Bonjour,je informe que le H-alpha de cette étoile, de l'absorption est devenue émission.
Je joins une comparaison.Quelqu'un peut confirmer?
Cordialement Umberto
HD 203024 H-alpha émission
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Re: HD 203024 H-alpha émission
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
Mike Potter
Beverly Hills Observatory
Mike Potter
http://www.beverlyhillsastronomer.org
http://www.beverlyhillsastronomer.org
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Re: HD 203024 H-alpha émission
Merci beaucoup Mike pour votre observation.
Dès que je peux, encore observer cette étoile
Cordialement Umberto
Dès que je peux, encore observer cette étoile
Cordialement Umberto
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Re: HD 203024 H-alpha émission
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.
Cordialemente Umberto
Confermo H-alpha absorption.
Il y a eu un échange de fichiers dans le processus de réduction de données.
Placez la comparaison exacte.
Cordialemente Umberto
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Re: HD 203024 H-alpha émission
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!
Paolo
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!
Paolo
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Re: HD 203024 H-alpha émission
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
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
Mike Potter
http://www.beverlyhillsastronomer.org
http://www.beverlyhillsastronomer.org