Optical State Changes in A0620-00 and the Interpretation of Ellipsoidal Light Curves

Details Optical State Changes in A0620-00 and the Interpretation of Ellipsoidal Light Curves Optical State Changes in A0620-00 and the Interpretation of Ellipsoidal Light Curves

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010...69c&link_type=abstract

A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10

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Photometric, Polarimetric, And Spectroscopic Instrumentation, Galactic Nuclei, Circumnuclear Matter, And Bulges, X-Ray Binaries

Scientific paper

We present optical and infrared photometry of the soft X-ray transient A0620-00, obtained by the SMARTS and YALO consortia, spanning from 1999-2007. Although A0620-00 was X-ray quiescent throughout this period, our data show three distinct optical states, characterized by magnitude, color, and aperiodic variability. In particular, we find that in what we call the ``passive'' state, A0620-00 exhibits no observable aperiodic variability on any timescale longer than our exposure length. The shape of the passive state light curve is consistent throughout our dataset. The other states are brighter than the passive state, and show enhanced aperiodic variability. These characteristics appear in NIR as well as optical data, suggesting that even NIR light curves may be contaminated if they were not obtained during the passive state. We suggest a reanalysis of historical data, using passive state data to determine the inclination and isolate additional sources of variability.

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