Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007uasb.conf...95b&link_type=abstract
UV Astronomy: Stars from Birth to Death. Proceedings of the Joint Discussion n.4 during the IAU general Assembly of 2006. Ana I.
Astronomy and Astrophysics
Astronomy
1
Uv Imaging, Uv Surveys, Hot Stars, Milky Way Structure, Optical Surveys
Scientific paper
We used Galaxy Evolution Explorer (GALEX) imaging survey data matched to the Sloan Digital Sky Survey (SDSS) in overlapping areas to explore the nature of the UV sources. We classify the sources by comparing their seven band photometry (GALEX far-UV, near-UV, SDSS u, g, r, i, z ) to model colors computed for different astrophysical objects, taking into account the effects of extinction. The initial sample covers mostly high galactic latitudes, and includes about 2 million sources. Based on our stellar models, we estimate that the GALEX surveys can detect hot White Dwarfs throughout the Milky Way halo (down to an estimated radius of 0.04Ro at the depth of the Medium Imaging Survey), providing an unprecedented improvement on the census of such objects in the Galaxy. Their observed surface density is consistently represented by the Milky Way models. Optical spectra available for a large subsample confirm the classification for the candidates selected from the GALEX photometry with about 97% purity for single hot stars and between 45-31% for binaries containing a hot WD and a cooler companion.
Bianchi Luciana
Efremova Boryana
GALEX Science Team
Herald James E.
Rodriguez Laget M. Viton L. M.
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