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9 stars looks new Be, to be confirm in High resolution

PostPosted: Sat Sep 27, 2014 10:20 am
by Thierry Lemoult
Hello

These past week i observe a few hundred of B star tnaks to a automated script. I do a first visual scan of the raw image and find évident emission in Ha for 9 stars:

BD+60 133
BD+28 4177
BD+57 2581
BD+59 2675
BD+60 2523
BD+63 1964 ??? look strange...
BD+64 106
HD 237126
HR 8107

All these stars need rapid confirmation in High resolution.
Regards
Thierry

Re: 9 stars looks new Be, to be confirm in High resolution

PostPosted: Sat Sep 27, 2014 11:19 am
by Andrew Smith
Thierry, a significant hall well done. I think BD+64 106 has been seen before as per my email but the others do not show as Be in the Catalogue of Stellar Spectral Classifications (Skiff, 2009-2014).

I doubt I will have any left to find if you proceed at this rate!

Regards Andrew

Re: 9 stars looks new Be, to be confirm in High resolution

PostPosted: Sat Sep 27, 2014 11:59 am
by Jacques Montier
Impressionnant travail Thierry !
Peux-tu détailler ta méthode d'enregistrement des spectres en automatique ?
Quel script et logiciel utilises-tu et surtout comment fais-tu pour arriver à positionner automatiquement une étoile sur la fente du spectro ?
Merci des infos et encore bravo !

Re: 9 stars looks new Be, to be confirm in High resolution

PostPosted: Sat Sep 27, 2014 1:13 pm
by Christian Buil
Many stars can look as Be. From my personnal data base and a long and patient bibliography research (at a time there was no Internet!), some example, nether entered in the "official" Be data base:

HD4881 (Simbad type: B9.5V):
Image

HD5839 (Simbad type B9 (?))
Image

HD191639 (Simbad B1V, noted Be in Simbad... but can be also a beta Cep star, ... )
Image

...

I hope you have better luck. The role of Coralie Neiner is important for analysis and confirmation.
But already, an essential first step is accomplished: the detection of suspected cases (and compilation of
a public list for reseach and more observations). Perfect.

(PS: it's clear the aspect of BD+69 1969 spectrum seem very different of a A or B type star).

Christian

Re: 9 stars looks new Be, to be confirm in High resolution

PostPosted: Sat Sep 27, 2014 1:57 pm
by Francois Teyssier
Super travail Thierry !
A la demande de Andrew, j'ai ouvert une sous-forum dédié à votre recherche afn de regrouper toutes les observations
http://www.spectro-aras.com/forum/viewforum.php?f=32
Bonne continuation
François

Re: 9 stars looks new Be, to be confirm in High resolution

PostPosted: Sun Sep 28, 2014 4:03 am
by Christian Buil
High resolution Halpha spectrum of some of Thierry suspected Be stars. Not so easy with a resolution of R = 50000 (nearly 100 time the Thierry original survey resolution), a relatively small telescope (C11) and a fiber link to the telescope (VHIRES-MO). Thierry, your stars are not so bright ;)

BD+28 4177 (evident double peak emission):
Image

BD+60 133 (very similar to an edge on disk):
Image

BD+60 2523 (most intense peak of the sequence):
Image

BD+64 106 (V = 10.2 and relatively short exposure - nearly the limit magnitude of this setup (but bad seeing and some wind)):
Image

HD237126 (most faintest Halpha emission of the sequence - sound like a Be stars..)
Image

Christian

Re: 9 stars looks new Be, to be confirm in High resolution

PostPosted: Sun Sep 28, 2014 7:19 am
by Thierry Lemoult
Many thanks Christian for these spectrum. Your high resolution spectrum are so impressive. Your setup work so well with emission star. I will continue the survey in low res, the setup work well, the script was lunch three day ago.. i hope some more new emission star finding. The average, is one finding per night.
Regards
Thierry

Re: 9 stars looks new Be, to be confirm in High resolution

PostPosted: Mon Nov 10, 2014 11:03 pm
by Robin Leadbeater
BD+57 2581 emission confirmed at high resolution (short observation during gap in clouds so poor SNR)

_bd+57_2581_20141110_018_Leadbeater.png
_bd+57_2581_20141110_018_Leadbeater.png (6.32 KiB) Viewed 4777 times


Cheers
Robin

Re: 9 stars looks new Be, to be confirm in High resolution

PostPosted: Tue Nov 25, 2014 9:28 pm
by Paolo Berardi
Hi Thierry, I observed BD+59 2675 with Lhires III 2400 (R~15000) and can confirm an emission line "bottle" shaped.

Image



Concerning requirements for Be stars I read in your page:

http://www.astrosurf.com/aras/be_candid ... idate.html

and the criterion: "3.High resolution spectra of Balmer lines does not show P Cygni or inverse P Cygni profiles", I wonder if such a characteristic is present in V594 Cas (in BeSS database) spectrum :

Image

It seems a P-cygni but I'm not expert and I do not know if it's an "extreme" Be star case.

Congratulations for your fantastic work!

Paolo