Computer Science
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop...88b&link_type=abstract
NOAO Proposal ID #2001A-0088
Computer Science
Scientific paper
Of all Galactic X-ray sources, the X-ray binaries (XRBs) located in the highly obscured region of the Galactic Bulge are amongst the most intriguing and elusive. The low-mass X-ray binaries GX17+2 and GX13+1 are two of the brightest sources in the X-ray sky. Although extensively studied at X-ray wavelengths, relatively little is known about the mass- donating stars, due to the heavy optical extinction in the direction of the Galactic center. However, the companions to these X-ray sources become visible in the IR; the counterparts in both systems have been identified, allowing us the opportunity to explore the characteristics of the mass donor stars in detail. Despite this, no orbital period has yet been established for either of these XRBs, leading to speculation that they may have long orbital periods (≳=5 d). We propose to obtain IR photometry across several months to search for short-term (~hours), intermediate (~days), and long-term (~1 month) periodicities. Identification of orbital modulations would place significant constraints on the masses of the companion stars and have substantial implications for the nature of these binaries.
Bandyopadhyay Reba M.
Wachter Stefanie
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