Windows on Galaxies pp 63-68 | Cite as
Hot Stars in Elliptical Galaxies
Abstract
The presence of a sizable UV radiation in the spectra of elliptical galaxies is observationally well established, but which kind of hot stars are responsible for the observed emission remains matter of speculation and debate (cf. Buson, Bertola, and Burstein, this volume). Ongoing massive star formation has on occasion been invoked (especially to account for the most powerful emitters), but several types of sufficiently hot stars are potentially present in old stellar populations (cf. Renzini 1981; Faber 1983; Renzini and Buzzoni 1986). In this connection, we are about to conclude a thorough investigation of the various (single and binary) hot star components which may be found in old stellar populations, and where we explore under which conditions these stars could account for the observed UV properties of ellipticals (Greggio and Renzini 1990). In this brief paper we anticipate some of our main conclusions regarding the single star candidates.
Keywords
Mass Loss Rate Globular Cluster Stellar Population Elliptical Galaxy Horizontal BranchPreview
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