Recurrent shell infall events in a B0.5e star: HD 58978 1979-1988

Details Recurrent shell infall events in a B0.5e star: HD 58978 1979-1988 Recurrent shell infall events in a B0.5e star: HD 58978 1979-1988

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.257g&link_type=abstract

In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 257-260 (SEE N89-10682 01-89)

Astronomy and Astrophysics

Astronomy

3

Iue, Mass Transfer, Spaceborne Astronomy, Stellar Envelopes, Ultraviolet Astronomy, Ultraviolet Spectra, Red Shift, Stellar Atmospheres, Stellar Mass Accretion, Stellar Winds

Scientific paper

Infall from the circumstellar envelope onto the bright B0.5 IVe star, HD 58978 was studied. The IUE data indicate that the star was surrounded by a low and moderately ionized circumstellar shell at least 12 times between 1979 and 1988. During 6 of these episodes, the signatures of cool circumstellar material were redshifted with respect to the photosphere by 20 to 80 km/sec. The data indicate that the transition from infall to minimal shell absorption can occur in under 10 days, and are consistent either with infall phases lasting up to 6 months, or with infall episodes shorter than 10 to 15 days. The long term behavior of the shell episodes is compared with variability in the stellar wind.

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