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arXiv:0708.0193 (astro-ph)
[Submitted on 1 Aug 2007]

Title:UV excess and AGB evolution in elliptical-galaxy stellar populations

Authors:Rosa A. Gonzalez-Lopezlira (CRyA-UNAM, Morelia, Mexico), A. Buzzoni (INAF - Osservatorio Astronomico di Bologna, Bologna, Italy)
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Abstract: The puzzling origin of the ``UV-upturn'' phenomenon, observed in some elliptical galaxies, has recently been settled by identifying hot HB stars as main contributors to galaxy ultraviolet luminosity excess. While a blue HB morphology seems a natural characteristic of metal-poor stellar populations, its appearence in metal-rich systems, often coupled with a poorer rate of planetary nebulae per unit galaxy luminosity, might be calling for an intimate connection between UV excess and AGB properties in early-type galaxies. In this work, we want to briefly assess this issue, relying on infrared surface brightness fluctuations as a powerful tool to trace AGB properties in external galaxies with unresolved stellar populations.
Comments: 6 pages, LaTeX, 4 figures, uses this http URL. To appear in``Ultraviolet properties of evolved stellar populations", ed. M. Chavez, E. Bertone, D. Rosa-Gonzalez, and L.H. Rodriguez-Merino, Astrophysics and Space Science Proceedings (Dordrecht:Springer), in press
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0708.0193 [astro-ph]
  (or arXiv:0708.0193v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0708.0193

Submission history

From: Rosa A. Gonzalez [view email]
[v1] Wed, 1 Aug 2007 16:39:34 UTC (86 KB)
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