Far-Ultraviolet Radiation from Elliptical Galaxies

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dc.creatorO'Connell, Robert W.
dc.date1999-06-03
dc.date.accessioned2026-07-07T11:34:11Z
dc.date.available2026-07-07T11:34:11Z
dc.descriptionFar-ultraviolet radiation is a ubiquitous, if unanticipated, phenomenon in elliptical galaxies and early-type spiral bulges. It is the most variable photometric feature associated with old stellar populations. Recent observational and theoretical evidence shows that it is produced mainly by low-mass, small-envelope, helium-burning stars in extreme horizontal branch and subsequent phases of evolution. These are probably descendents of the dominant, metal rich population of the galaxies. Their lifetime UV outputs are remarkably sensitive to their physical properties and hence to the age and the helium and metal abundances of their parents. UV spectra are therefore exceptionally promising diagnostics of old stellar populations, although their calibration requires a much improved understanding of giant branch mass loss, helium enrichment, and atmospheric diffusion.
dc.description46 pages; includes LaTeX text file, 9 PS figures, 1 JPG figure, 2 style files. Full resolution figures and PS version available at http://www.astro.virginia.edu/~rwo/araa99/. Article to appear in Annual Reviews of Astronomy & Astrophysics, 1999
dc.identifierhttps://arxiv.org/abs/astro-ph/9906068
dc.identifierhttp://arxiv.org/abs/astro-ph/9906068
dc.identifierAnn.Rev.Astron.Astrophys.37:603-648,1999
dc.identifierdoi:10.1146/annurev.astro.37.1.603
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/198159
dc.subjectAstrophysics
dc.titleFar-Ultraviolet Radiation from Elliptical Galaxies
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