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Title:
Shock phenomena in Beta Cephei stars
Authors:
Crowe, R.; Gillet, D.
Affiliation:
AA(Hawaii, University, Hilo), AB(Haute-Provence, Observatoire, Saint-Michel-l'Observatoire, France)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 211, no. 2, March 1989, p. 365-382. (A&A Homepage)
Publication Date:
03/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CEPHEID VARIABLES, SHOCK WAVES, STELLAR OSCILLATIONS, CARBON, H ALPHA LINE, LINE SPECTRA, RADIAL VELOCITY, SPECTRAL LINE WIDTH, STELLAR ATMOSPHERES, VELOCITY DISTRIBUTION
Bibliographic Code:
1989A&A...211..365C

Abstract

High resolution observations of Beta Cephei stars were made throughout the stars' pulsation cycles. Evidence for two shock waves are found in the spectral sequences of BW Vulpeculae. Because shock waves are absent in the H-alpha profiles of Nu Eridani and Gamma Pegasi, it is suggested that the shock wave interpretation for classical Beta Cephei stars is inaccurate. A transition between Beta Cephei stars with small velocity amplitude and those with large velocity amplitude is proposed. Stars with large velocity amplitude, such as BW Vulpeculae, 12 Lacertae, and Delta Scorpii, display two shocks per period and a velocity stillstand, while classical Beta Cephei stars have only one shock wave per period.

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