Astron. J., 127, 2838-2849 (2004/May-0)
Faint high-latitude carbon stars discovered by the Sloan Digital Sky Survey: an initial catalog.
DOWNES R.A., MARGON B., ANDERSON S.F., HARRIS H.C., KNAPP G.R., SCHROEDER J., SCHNEIDER D.P., YORK D.G., PIER J.R. and BRINKMANN J.
Abstract (from CDS):
A search of more than 3000 deg2 of high-latitude sky by the Sloan Digital Sky Survey has yielded 251 faint high-latitude carbon stars (FHLCs), the large majority previously uncataloged. We present homogeneous spectroscopy, photometry, and astrometry for the sample. The objects lie in the 15.6<r<20.8 range and exhibit a wide variety of apparent photospheric temperatures, ranging from spectral types near M to as early as F. Proper-motion measurements for 222 of the objects show that at least 50%, and quite probably more than 60%, of these objects are actually low-luminosity dwarf carbon (dC) stars, in agreement with a variety of recent, more limited investigations that show that such objects are the numerically dominant type of star with C2in the spectrum. This SDSS homogeneous sample of ∼110 dC stars now constitutes 90% of all known carbon dwarfs and will grow by another factor of 2-3 by the completion of the survey. As the spectra of the dC and the faint halo giant C stars are very similar (at least at spectral resolution of 103), despite a difference of 10 mag in luminosity, it is imperative that simple luminosity discriminants other than proper motion be developed. We use our enlarged sample of FHLCs to examine a variety of possible luminosity criteria, including many previously suggested, and find that, with certain important caveats, JHK photometry may segregate dwarfs and giants.
Astrometry - Stars: Carbon - Stars: Statistics - Surveys
VizieR on-line data:
<Available at CDS (J/AJ/127/2838): table1.dat>
BASV 461 and 578 are [BS61] 461 and [BS61] 578.
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