On the origin of shock waves in the beta Cephei star BW Vulpeculae

Details On the origin of shock waves in the beta Cephei star BW Vulpeculae On the origin of shock waves in the beta Cephei star BW Vulpeculae

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...339..525m&link_type=abstract

Astronomy and Astrophysics, v.339, p.525-530 (1998)

Astronomy and Astrophysics

Astrophysics

10

Line: Profiles, Shock Waves, Stars: Individual: Bw Vulpeculae, Stars: Oscillations

Scientific paper

New high temporal and spectral resolution observations of BW Vul are presented. The line doubling phases, occurring twice per pulsation cycle during the velocity discontinuities, are interpreted in terms of shock waves. The first and largest doubling is seemingly due to the formation of a shock wave during the supersonic infalling motion of the atmosphere. The famous observed stillstand would be only the last phase of the ballistic motion which seems marked by a small bounce of the atmospheric layers on the photosphere. Then, a new shock wave, probably initiated by the iron kappa -mechanism, sweeps the layers upward. There is some indications that the amplitude of the motion of atmospheric layers changes from one pulsation cycle to another one. Based on observations obtained at the Observatoire de Haute Provence (France)

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