SIMBAD references

1996A&A...315L.401H - Astronomy and Astrophysics, volume 315, L401-404 (1996/11-3)

New aspects of the variability of β Cep.


Abstract (from CDS):

A few years ago, β Cep - a prototype of hot rapid spectral and light variables which are generally believed to pulsate - was also confirmed to be a Be star and a magnetic Bp star. Our investigation of red Reticon spectra of β Cep obtained during the presence of the Hα emission revealed a new surprising aspect of the variability of this star: Radial velocity of the double Hα emission, measured on the wings of the emission line, varies in antiphase to absorption radial-velocity with the known period of 0.19048d. It also varies on a longer time scale: over the period from 1994 to 1996 the mean radial velocity of the Hα emission increased from 24 to 63km/s. Possible serious impact of these finding on the current interpretation of the β Cep phenomenon is briefly discussed. It is also found that β Cep is rapidly approaching the periastron of its 90-yr orbit, much sooner than predicted, and an intensive monitoring is called for.

Abstract Copyright:

Journal keyword(s): Stars: binaries: spectroscopic - Stars: binaries: visual - Stars: emission-line, Be - Stars: oscillations - Stars: rotation - Stars: individual: β Cep

Simbad objects: 1

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