Computer Science
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..318s&link_type=abstract
NOAO Proposal ID #2002A-0318
Computer Science
Scientific paper
Hot subdwarf (sdB) stars are believed to be the field equivalent of the extended horizontal branch stars seen in some globular clusters. We have identified a large sample of sdB stars that exhibit infrared excesses, which can be attributed to the presence of an unresolved late- type companions of G-K spectral type. The presence of companions is expected if the post-main sequence mass loss of these stars is due to binary interactions. We propose to obtain moderate resolution spectra of a subset of these stars in the regions of 4500-7000A and 6500- 9000A in order to study features from the cool companion of the sdB stars. We will use the Ca II IR triplet (8498, 8542, 8662A) and the Na I D doublet (5889, 5895A) from the cool companion, along with existing photometry, to decompose the composite sdB+late type spectrum to determine the spectral type, luminosity class, and fraction of the total light contributed by the cooler component. Using this information about the cool component, we can independently constrain the luminosity of sdB stars independent of any uncertainties in the modeling of the subdwarfs' spectrum.
Stark Michele
Wade Richard
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