The outer atmospheres of late-type giant stars

Details The outer atmospheres of late-type giant stars The outer atmospheres of late-type giant stars

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..189j&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 189-19

Astronomy and Astrophysics

Astrophysics

1

Chromosphere, Giant Stars, Stellar Structure, Ultraviolet Spectroscopy, Iue, Stellar Models, Stellar Spectra

Scientific paper

Results of recent work with IUE on the structure of the outer atmospheres of late-type giant stars are summarized, based on empirical constraints derived from emission lines in α Boo (K2 III), α Tau (K5 III) and β Gru (M5 III), observed with deep exposures in the high resolution mode of IUE. These stars have IUE spectra typical of giant stars on the "wind" side of the "corona-wind division" in the HR diagram. Particular attention is paid to the structure of the emitting regions, including densities, temperatures, inhomogeneities, geometric extents and velocity fields. Comparisons are made with earlier chromospheric models and with other spectroscopic work, and trends with stellar parameters are examined. Finally, the implications of this work for modelling the winds of red giants are discussed.

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