[vsnet-campaign-be 274] Catalog of Galactic Beta Cephei Stars

[Taichi Kato]

Catalog of Galactic Beta Cephei Stars

   Perhaps Be-star folks might be also interested.  Imada-san would be
able to explain a bit further about the relation/distinction between Be stars
and beta Cep stars...

Paper: astro-ph/0506495
Date: Tue, 21 Jun 2005 14:20:15 GMT   (228kb)

Title: Catalog of Galactic Beta Cephei Stars
Authors: Anamarija Stankov and Gerald Handler
Journal-ref: ApJS 158:193-216, 2005 June
\\
  We present an extensive and up-to-date catalog of Galactic Beta Cephei stars.
This catalog is intended to give a comprehensive overview of observational
characteristics of all known Beta Cephei stars. 93 stars could be confirmed to
be Beta Cephei stars. For some stars we re-analyzed published data or conducted
our own analyses. 61 stars were rejected from the final Beta Cephei list, and
77 stars are suspected to be Beta Cephei stars. A list of critically selected
pulsation frequencies for confirmed Beta Cephei stars is also presented. We
analyze the Beta Cephei stars as a group, such as the distributions of their
spectral types, projected rotational velocities, radial velocities, pulsation
periods, and Galactic coordinates. We confirm that the majority of these stars
are multiperiodic pulsators. We show that, besides two exceptions, the Beta
Cephei stars with high pulsation amplitudes are slow rotators. We construct a
theoretical HR diagram that suggests that almost all 93 Beta Cephei stars are
MS objects. We discuss the observational boundaries of Beta Cephei pulsation
and their physical parameters. We corroborate that the excited pulsation modes
are near to the radial fundamental mode in frequency and we show that the mass
distribution of the stars peaks at 12 solar masses. We point out that the
theoretical instability strip of the Beta Cephei stars is filled neither at the
cool nor at the hot end and attempt to explain this observation.
\\ ( http://arXiv.org/abs/astro-ph/0506495 ,  228kb)