Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/34068
Title: | New Candidate EHB Stars in the Open Cluster NGC 6791: Looking Locally Into the UV-Upturn Phenomenon | Authors: | Buson, L. M. Bertone, E. BUZZONI, Alberto Carraro, G. |
Issue Date: | 2006 | Journal: | BALTIC ASTRONOMY | Number: | 15 | First Page: | 49 | Abstract: | Relying on U and B imagery at the Italian Telescopio Nazionale Galileo (TNG), we report here the discovery of a sample of 13 new UV-bright post-HB candidate stars in the field of the Galactic open cluster NGC 6791. Owing to its super-solar metal content ([Fe/H] ≳ 0.2 dex) and estimated age (t ≳ 8 Gyr), this cluster represents the nearest and ideal stellar aggregate to match the distinctive properties of the evolved stellar populations possibly ruling the UV-upturn phenomenon in elliptical galaxies and bulges of spirals. Our ongoing spectroscopic follow-up of this unique UV-bright sample will allow us to assess -- once cluster membership of the candidates is properly checked -- the real nature (e.g., sdB, sdO, AGB-manqué or EHB stars) of these hot sources and their link with the ultraviolet excess emerging from low-mass, metal-rich evolutionary environments of external galaxies. | URI: | http://hdl.handle.net/20.500.12386/34068 | ISSN: | 1392-0049 | Bibcode ADS: | 2006BaltA..15...49B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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2006BaltA..15...49B.pdf | 53.68 kB | Adobe PDF | View/Open |
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