Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..150g&link_type=abstract
NOAO Proposal ID #1999A-0150
Computer Science
Scientific paper
We have completed a sensitive near IR photometric search for cool red dwarf companions to hot, EUV-detected white dwarfs (WDs). The high WD temperatures (24000< T_eff< 70000K) insure excellent IR flux contrast with cool dwarfs, enabling us to identify a dozen candidates. A few such composite systems have been found optically among WDs detected in recent EUV All-Sky Surveys, but our IR technique probes further down the main sequence (MS), and to wider separations, where we find a significantly larger fraction of companions. As planned, we now propose to follow up our successful imaging survey with IR spectroscopy to determine the mass and spectral type of the cool companions using CRSP at R~1500 in the K band atmospheric window. Our survey will lead to better estimates of the fraction of WDs with MS companions, and the mass ratio distribution in binaries. As the progenitors of novae, CVs, symbiotics, Feige 24-type systems, and the intriguing dwarf carbon stars, these WD+MS systems warrant the improved constraints on their masses and abundance enhancements that IR spectroscopy of our sample will provide.
Ali Babar
Green Paul J.
Joyce Richard R.
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