Other
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..153w&link_type=abstract
NOAO Proposal ID #2001A-0153
Other
Scientific paper
Low mass X-ray binaries (LMXBs), in which a neutron star (NS) or black hole accretes matter from a late type star, are important systems for the determination of NS masses. Since the majority of LMXBs are located in the highly obscured regions of the Galactic plane and bulge, IR observations are particularly suited for the study of their counterparts. Up to now, very few LMXBs have been observed in the IR: out of 124 sources, IR colors are only known for about 10--15. This is due to their faintness and location in crowded fields, which requires the sensitivity and spatial resolution of IR arrays. Very little is known about the relative contributions of the mass donor and the disk at IR wavelengths. If the IR flux from the disk is negligible, then estimates of the donor star mass can be made through spectral typing. On the other hand, if the IR radiation mainly arises from the disk, IR colors can be used to infer disk parameters such as the maximum radius, temperature gradient, and central temperature. We propose to determine accurate IR colors for all LMXBs with known counterparts in order to obtain a complete, uniform census of their IR emission characteristics.
Bandyopadhyay Reba M.
Wachter Stefanie
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