SIMBAD references

2006BaltA..15...49B - Baltic Astronomy, 15, 49-52 (2006/February-0)

New candidate EHB stars in the open cluster NGC 6791: looking locally into the UV-upturn phenomenon.

BUSON L.M., BERTONE E., BUZZONI A. and CARRARO G.

Abstract (from CDS):

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-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.

Abstract Copyright:

Journal keyword(s): stars: sudwarfs - stars: horizontal-branch - ultraviolet: stars

Simbad objects: 3

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2006BaltA..15...49B and select 'bookmark this link' or equivalent in the popup menu