Pulsation of the outer atmosphere of BW VUL

Details Pulsation of the outer atmosphere of BW VUL Pulsation of the outer atmosphere of BW VUL

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157...47b&link_type=abstract

The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited

Astronomy and Astrophysics

Astronomy

1

Cepheid Variables, Iue, Stellar Atmospheres, Ultraviolet Astronomy, Carbon, Photometry, Photosphere, Pulse Duration, Radial Velocity, Silicon, Stellar Winds

Scientific paper

Observations of the far UV spectrum of the beta Cephei variable BW Vul show that the pulsation consists of three phases: a phase of photospheric rest; a sudden upward acceleration of the photosphere and outer atmosphere (the maximum acceleration being approximately equal to the gravitational value); descent of the whole atmosphere with downward acceleration 1/4 of the gravitational value. At the end of the second phase a temporal stellar wind occurs with maximum velocity of 500 km s(-1).

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