The pulsation of the outer layers of the beta Cephei-type variable BW VUL

Details The pulsation of the outer layers of the beta Cephei-type variable BW VUL The pulsation of the outer layers of the beta Cephei-type variable BW VUL

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107..320b&link_type=abstract

Astronomy and Astrophysics, vol. 107, no. 2, Mar. 1982, p. 320-325.

Astronomy and Astrophysics

Astrophysics

20

Cepheid Variables, Spectral Line Width, Stellar Oscillations, Stellar Spectra, Ultraviolet Spectra, Atmospheric Models, Iue, Photosphere, Resonance Lines, Stellar Mass Ejection, Stellar Winds

Scientific paper

Eleven high-resolution ultraviolet spectrograms of BW Vul were obtained by means of the IUE over 1.6 periods to compare the pulsation of this star as observed in the strong far-UV resonance lines with observations of the UV lines of photospheric origin. The radial velocity curve of the C IV lines is different from the photospheric one, showing that both the photosphere and the C IV layers are accelerated upwards impulsively. After about one hour, the acceleration decreases to zero, and then the atmosphere falls with a nearly constant downward acceleration of 2100 cm/sq s. The varying asymmetry indicates mass loss due to the pulsation of the atmosphere, superimposed on the continuous mass loss of the star.

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