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26 April 2024 |
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New Candidate EHB Stars in the Open Cluster NGC 6791: Looking Locally into the UV-upturn Phenomenon | | L.M. Buson
; E. Bertone
; A. Buzzoni
; G. Carraro
; | | Date: |
26 Sep 2005 | | Subject: | astro-ph | | Affiliation: | INAF - Osservatorio di Padova, Italy, INAOE, Puebla, Mexico, INAF - Osservatorio di Bologna, Italy, Dept. de Astron. Univ. de Chile, Santiago | | Abstract: | Relying on U,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-manque’ 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. | | Source: | arXiv, astro-ph/0509772 | | Services: | Forum | Review | PDF | Favorites | |
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