Shock phenomena in Beta Cephei stars

Details Shock phenomena in Beta Cephei stars Shock phenomena in Beta Cephei stars

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...211..365c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 211, no. 2, March 1989, p. 365-382.

Astronomy and Astrophysics

Astrophysics

18

Cepheid Variables, Shock Waves, Stellar Oscillations, Carbon, H Alpha Line, Line Spectra, Radial Velocity, Spectral Line Width, Stellar Atmospheres, Velocity Distribution

Scientific paper

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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