Computer Science
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..286s&link_type=abstract
NOAO Proposal ID #2000A-0286
Computer Science
Scientific paper
The study of luminous X-ray binaries is important in our understanding of the late stages of stellar evolution. To this end, simultaneous photometry and spectroscopy are needed to probe a system's geometrical and dynamical conditions. Minimum light should occur 0.25 cycle after maximum radial velocity for a simple geometry, but data for the supersoft X-ray binary RX J0925.7-4758 from a recent 0.9-m/4-m CTIO observing run show a 0.15-cycle shift, implying the emission-line region is not coincident with the compact object. However, this interpretation is sensitive to large gaps in phase coverage because the 3.8-day orbital period exceeds a single night's observing and the duration of a typical (4--8 night) observing run covers only 1--2 orbits. Thus, the measured phasing may be strongly influenced by cycle-to-cycle variations that cannot be assessed from existing data. We request synoptic observations with the YALO telescope during the coming semester to study the long- term photometric behavior of RX J0925.7-4758, allowing us to refine the system's period and reliably determine the orbital phasing. The request is for 20 hours of telescope time (equivalent to two 10-hour nights).
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