12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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Pulsating B stars in the LMC

Presented by Dr. Christian ENGELBRECHT on 13 Jul 2011 from 15:00 to 15:15
Type: Oral Presentation
Session: APSS
Track: Track D1 - Astrophysics

Content

<p>Pigulski and Kolaczkowski (2002, A&A 388, 88) announced the first discovery of Beta Cephei (BCep) pulsators in the LMC. This was a remarkable discovery, since theoretical analyses of pulsational stability had previously predicted that early B main-sequence stars with metallicities lower than Z = 0.01 should not pulsate at all (e.g. Pamyatnykh 1999, Acta Astron 49, 199). Following this announcement, and announcements of 92 BCep candidates in the LMC by Kolaczkowski and Pigulski (2006, MemSAIt. 77, 336), more detailed studies adopting a variety of opacity calculations and metal mixtures indicated that BCep pulsations could be explained in low-metallicity environments after all (Miglio et al. 2007, MNRAS 375, L21; Miglio et al. 2007, Com.Ast. 151, 48; Zdravkov and Pamyatnykh 2008, J.Phys.Conf.Ser. 118, 012079). In order to ascertain the nature of these pulsations, multi-colour photometry of sufficient precision is required. We have obtained 4 weeks of UBVI photometry on two fields in the LMC that surround stars which have been identified as strong Beta Cephei candidates from OGLE data. We report on the results of this photometric campaign.

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Short Paper

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Room: Acro2


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