Optical Observations of the Black Hole LMXB J1118+480

Details Optical Observations of the Black Hole LMXB J1118+480 Optical Observations of the Black Hole LMXB J1118+480

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915305m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.05

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We present optical observations of the black hole X-ray binary J1118+480 obtained, on 12 nights during 2010 and a single night in June 2011, using the McDonald Observatory 2.1-m Otto Struve Telescope and Argos photometer using a BVR filter. J1118+480 is an X-ray transient currently in quiescence. A period study yields a period of P = 0.08496672 +/- 0.00000024 days. We derive a zero point crossing (negative to positive) of T(zero) = 2455324.60280 +/- 0.00025 HJD The light curves clearly show large amplitude sinsoidal variation at 1/2 of the orbital period. There is a hint that one of the ellipsoidal variation minima may be deeper, at times, than the other. Additional, planned, observations are expected to yield a precise long-term ephemeris and more fully characterize the ellipsoidal variations. This work is part of the NSF/PAARE program for Education and Research.

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