Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.1610s&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #16.10; Bulletin of the American Astronomical Society, Vol. 34, p.1126
Other
1
Scientific paper
SDSS spectroscopy of some 8000 high-latitude main-sequence-turnoff stars between magnitudes r* = 15-18.5 finds that 20 show the Swan bands of C2, as well as anomalously strong CH bands. Three further members of this class are found in other SDSS spectroscopy. The ``underlying'' spectra are dominated by strong Balmer and CaII absorption, corresponding to late F/G spectral type. The spectra resemble those of the giant and subgiant CH stars, but the proper motion information suggests that many are main-sequence stars. The effective temperatures (as estimated from SDSS and 2MASS photometry) fall in the range 5000 K to 6400 K, while the strengths of the CaII lines and the radial velocities suggest that most of these are metal-poor halo stars. The discovery of these objects shows that stars with C/O > 1 extend all the way along the old main sequence, and measures the fraction of the halo main sequence stars which are carbon stars to be 0.2%. Funding for the SDSS is provided by the Alfred P. Sloan Foundation, NASA, NSF, DoE, Monbukagakusho, the Max Planck Society and the member institutions. The SDSS web site is http://www.sdss.org/.
Anderson Scott
Downes Ron
Eisenstein Daniel
Gunn James E.
Harris Hugh
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