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En comparant 2 spectres de HD 57682 à moins d'un mois d'interval, j'ai constaté que la position de la raie H alpha était décalée entre les 2 spectres alors que la raie de l'HeI 6678 figurant sur le même spectre resté inchangé.

J'ai essayé de trouver des informations sur cette étoile sur le web mais sans succés à part sur le magnétisme de cette étoile.Ce décalage semble n'impacter que le nuage en rotation ?

Quelqu'un aurait il des informations sur ce que l'on observe sur cette étoile qui figure dans le calatogue BESS apparenté Be ou Herbig mais classé dans SIMBAD comme étoile O9 ?

By comparing 2 spectra of HD 57682 within one month interval, I found that the position of the H alpha line was shifted between the 2 spectra. And HeI 6678 appearing on the same spectrum remained unchanged.

I tried to find information about this star on the web but I only find some informations about the magnetism of this star.

Is there someone who have information on what is observed on this star ? HD 57682 is in BESS calatogue but classified in SIMBAD as O9 star.

Oliver, I assume you found this https://arxiv.org/pdf/0910.0214.pdf

Regards Andrew

Hi Olivier, very fast h-Alpha line changes, thank you for sharing the observation.

But... a good "magnetic" target for Christian?

Another paper found by Vizier (https://arxiv.org/abs/1101.4002) reports a note:

HD 57 682. A magnetic field has been discovered in this star (Grunhut et al. 2009). The spectral lines are extremely sharp and there are Balmer profile variations at high resolution very similar to those in the Of?p stars at earlier types.

Paolo

Hi Andrew and Paolo,
Thank you for the papers...

I found also a link with some observations made by Benjamin Mauclaire, Thierry Garrel and Christian Buil :
http://www.astrosurf.com/aras/surveys/bestars/hd57682/

Bonjour Oliver,

You're doing a good job, is a star very interesting.

We have passed step one observation night.

Amicalement, Joan.