Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109..289b&link_type=abstract
Astronomy and Astrophysics, vol. 109, no. 2, May 1982, p. 289-293.
Astronomy and Astrophysics
Astrophysics
10
Cepheid Variables, Stellar Mass Ejection, Stellar Oscillations, Carbon, Iue, Photosphere, Silicon, Stellar Winds, Ultraviolet Spectra
Scientific paper
The pulsation of the outer layers of the Beta Cephei-type variable Alpha Sco is investigated using 17 ultraviolet spectrograms (1200-2000 A) obtained during seven hours of observations with the International Ultraviolet Explorer. A pulsational model established earlier for BW Vul is confirmed. According to this model, after a period of photospheric rest the outer layers expand suddenly. The acceleration for the outermost layers, investigated with the resonance lines of C IV and Si IV, is found to be larger than for the photosphere. During the phase of deceleration that follows, no falling down of the C IV absorbing layers is observed; their velocity component remains directed outward. A transient stellar wind component sets in just before the star has its minimum radius (phase, approximately 0.9); it is strongest at a phase of approximately 0.2. The observations are interpreted as suggesting the mechanism of pulsational driven mass loss.
Burger Marc
de Jager Cornelis
van den Oord H. J. G.
No associations
LandOfFree
The pulsation of the outer layers of the Beta Cephei star Alpha SCO does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The pulsation of the outer layers of the Beta Cephei star Alpha SCO, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The pulsation of the outer layers of the Beta Cephei star Alpha SCO will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1099911