X0614+091:A Search for the Orbital Period

Details X0614+091:A Search for the Orbital Period X0614+091:A Search for the Orbital Period

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.3801j&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #38.01; Bulletin of the American Astronomical Society, Vol. 32, p.734

Astronomy and Astrophysics

Astronomy

Scientific paper

We present extensive new photometry of the low mass X-ray binary (LMXB) X0614+091. Discovered in 1974, its X-ray properties have only recently identified it as a member of the so-called Atoll sources. Atoll sources are thought to have main sequence mass donors and relatively short (< 8 hours) orbital periods. Early observations of the faint (V=18.5) optical counterpart revealed an unusual spectrum that only showed the NIII/CIII 4640/50 emission complex. LMXB spectra usually also exhibit HeII 4686 emission. Previous variability searches detected a 5.2 day modulation in X-rays and a 10 day periodicity in the optical. If either one of these modulations reflects the orbital period, mass transfer via Roche lobe overflow would require a giant secondary, inconsistent with the observed optical properties of the source. An alternative cause for the variations is precession of the accretion disk in the system. We obtained V band observations of X0614 with the queue scheduled YALO telescope at CTIO between UT 1999 Dec 10 and 2000 Jan 31 in order to confirm the reported 10 day variability and search for an orbital period. Comparison with RXTE ASM data reveals that some of the optical observations occurred during a rare state of decreased X-ray variability of the source. We will report on the results of the period analysis and the correlation between optical and X-ray data for X0614+091. This research was carried out as part of the 2000 Research Experiences for Undergraduates Program at CTIO, funded by the National Science Foundation.

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