Computer Science
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1771b&link_type=abstract
IUE Proposal ID #IBGBB
Computer Science
Scientific paper
Several binary star systems containing an F giant or bright giant and a Be component, all showing strong H-alpha emission, are to be examined at middle or far ultraviolet wavelengths at several orbital phases each. Previous IUE observations of some of these systems show strong MgII emission which varies in intensity and profile on a timescale of at least a few days. In one case the UV spectrum of an F + Be star showed a change in flux by a factor of two and a change in nature from a complex absorption line spectrum similar to the interacting binary SX Cas to a more conventional hot star plus mild wind. We wish to learn to what extent those binaries are related to or differ from the "W Serpentis" binary systems containing hot plasma. High-resolution UV spectroscopy will be feasible and will give insight into the probable location of the plasma (envelope or accretion disc around the hot star, gas streams, and/or extended atmosphere of the cool star) and evolutionary status of these systems and related objects.
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