Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..372..273d&link_type=abstract
15th European Workshop on White Dwarfs ASP Conference Series, Vol. 372, proceedings of the conference held 7-11 August, 2006 in
Astronomy and Astrophysics
Astronomy
Scientific paper
The blue object 1222+102 lies in the direction of the Virgo--Coma cluster and well inside the boundaries of the galaxy NGC 4380. While it was formerly proposed as a result of expulsion from the galactic nucleus, from a recent ESO--VLT spectroscopic survey of BL LAC objects, Sbarufatti et al. (2006) suggest a stellar nature, implying a galactic origin. Here we present a further investigation of the FORS1 spectrum which indicates that 1222+102 is a DQ white dwarf with one of the highest carbon abundance known so far. This object can hence be definitively ascribed as a high latitude galactic white dwarf at a distance of about 110--120pc. Its high temperature and carbon abundance suggest that it might be a member of the recently proposed (Dufour et al. 2005; Koester & Knist 2006) separate population of carbon-rich DQ stars with an abundance 1 dex higher at the same effective temperature of the primary sequence.
de Martino Domitilla
Falomo Renato
Koester Detlev
Sbarufatti Boris
Treves Aldo
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