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Title:
Shock Phenomena in β Cephei Stars
Authors:
Crowe, R.; Gillet, D.
Publication:
The Impact of Very High S/N Spectroscopy on Stellar Physics: Proceedings of the 132nd Symposium of the International Astronomical Union held in Paris, France, June 29-July 3, 1987. Edited by G. Cayrel de Strobel and Monique Spite. International Astronomical Union. Symposium no. 132, Kluwer Academic Publishers, Dordrecht., p.169
Publication Date:
00/1988
Origin:
ADS
Bibliographic Code:
1988IAUS..132..169C

Abstract

The authors present new observations of β Cephei stars made with the CFHT coudé Reticon. Spectral sequences of the extreme star BW Vulpeculae show large velocity and line profile changes in Hα and in the C II doublet (λλ6578, 6582) over 0.04 of a cycle, during three different cycles on three different nights. In fact, there are two such phases of line doubling where the velocities are nearly discontinuous before and after the so-called velocity "stillstand" (near maximum light). The most straightforward interpretation of these observations is that there are two shock waves, separated by about 50 minutes, which generate double absorption components. For ν Eridani and γ Pegasi, there are no discernible changes in the Hα profiles, despite rather regular velocity variations. This argues against the shock-wave interpretation for "classical" β Cephei stars.

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