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

Author
Henrichs, H. F.
Published
Jun 1, 1988.
Physical Description
1 electronic document
Additional Creators
Bjorkman, K. S., Grady, C. A., and Peters, G. J.
Online Version

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Summary
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.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19890001361.
Accession ID: 89N10732.
ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1; p 257-260.
Terms of Use and Reproduction
No Copyright.
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