Optical Observations of the Orbital Period of the Black Hole Candidate XTE J1550-564 During Re-Flare and Quiescence

Details Optical Observations of the Orbital Period of the Black Hole Candidate XTE J1550-564 During Re-Flare and Quiescence Optical Observations of the Orbital Period of the Black Hole Candidate XTE J1550-564 During Re-Flare and Quiescence

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.3805j&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #38.05; Bulletin of the American Astronomical Society, Vol. 32, p.735

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the detection of periodic modulation from the black hole candidate XTE J1550-564 late in its outburst cycle and also during quiescence. Data were collected using the Yale 1-m telescope located in Chile as part of an extensive multi-wavelength monitoring campaign of XTE J1550-564. We have searched for periodicities in the optical light curve and find a clear signal at P=1.546+/-0.038 with peak-to-peak amplitude of roughly 0.15 magnitudes during the final stage of the outburst when the overall light curve was still decaying at a rate of 0.05 mags/day. >From the quiescence data, we find a double peaked ellipsoidal modulation with P=1.540+/-0.008 days with nearly double the peak-to-peak amplitude ~ 0.36 mags. The large amplitude suggests the system is at a high inclination. Consequently, if the compact object is indeed a black hole, the mass function is likely to exceed 3M&sun; , which is the maximum stable limit of the neutron star.

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