Candidate subdwarfs and white dwarfs (Gontcharov+, 2011)

Details Candidate subdwarfs and white dwarfs (Gontcharov+, 2011) Candidate subdwarfs and white dwarfs (Gontcharov+, 2011)

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ycat..74131581g&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/413/1581. Originally published in: 2011MNRAS.413.1581G

Astronomy and Astrophysics

Astronomy

Surveys, Stars: White Dwarf, Stars: Subdwarf, Proper Motions, Photometry, Stars: Distances

Scientific paper

Photometry from the Two-Micron All-Sky Survey (2MASS), United States Naval Observatory CCD Astrograph Catalog (UCAC3) and SuperCosmos catalogues, together with proper motions from the Tycho-2, Kharkiv Proper Motions (XPM) and UCAC3 catalogues, is used to select all-sky samples of 28 candidate white dwarfs, 1826 evolved and 7641 unevolved subdwarfs for R from 9-17mag. The samples are separated from main-sequence stars with an admixture of less than 10 per cent, owing to an analysis of the distribution of the stars in colour index versus reduced proper-motion diagrams for various latitudes using related Monte Carlo simulations. It is shown that the XPM and UCAC3 catalogues have the same level of proper-motion accuracy. Most of the selected stars have at least six-band photometry. This allows us to eliminate some admixtures and reveal some binaries. Empirical calibrations of absolute magnitude versus colour index and reduced proper motion for Hipparcos stars give us distances and a three-dimensional (3D) distribution for all the selected stars. It is shown that the subdwarf samples are almost complete for the Tycho-2 stars, i.e. to 11mag or 150pc from the Sun. For fainter stars from the XPM and UCAC3 catalogues, the subdwarf samples are complete only to 20-60 per cent because of the selection method and incompleteness of the catalogues.
(1 data file).

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