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Date and Time of the Query: 2019-04-24 T09:10:54 PDT
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For refcode 2002A&A...393..843D:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2002A&A...393..843D The far-ultraviolet emission of early-type galaxies J.-M. Deharveng, A. Boselli and J. Donas Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, Les Trois Lucs, BP 8, 13376 Marseille Cedex 12, France Received 20 March 2002/Accepted 12 July 2002 Abstract. We have assembled a UV-flux selected sample of 82 early-type galaxies and collected additional information at other wavelengths. These data confirm a large spread of the UV-V color in the range 2 to 5. The spread in UV-V is accompanied by a spread in B-V that is mainly attributed to the range of morphological types and luminosities. A large fraction of the objects have red colors, UV-V = 4 +/- 0.4, corresponding to a weak UV-upturn as observed with IUE. If the current interpretation for the UV emission from early-type galaxies is applicable to our sample, the PAGB (Post-Asymptotic Giant Branch) tracks are the most common evolution path for the low-mass stars responsible for the UV emission. A small number of very blue (UV-V < 1.4) objects have been found that can be reasonably interpreted as harbouring some low level of star formation. In contrast to a previous sample based on IUE observations, no correlation is found between the UV-V color and the Mg_2_ spectral line index; possible explanations are reviewed. The potential of a more extended UV survey like GALEX is briefly presented. Key words: stars: AGB and post-AGB - stars: horizontal-branch - galaxies: stellar content - galaxies: elliptical and lenticular, cD - ultraviolet: galaxies
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