Optical State Changes in the X-Ray-quiescent Black Hole A0620-00

Details Optical State Changes in the X-Ray-quiescent Black Hole A0620-00 Optical State Changes in the X-Ray-quiescent Black Hole A0620-00

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...673l.159c&link_type=abstract

The Astrophysical Journal, Volume 673, Issue 2, pp. L159-L162.

Astronomy and Astrophysics

Astronomy

15

Accretion, Accretion Disks, Stars: Individual: Alphanumeric: A0620-00, X-Rays: 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 the period 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 existence of these states may explain the differences between phased light curves observed by previous authors. We suggest that in order to obtain the purest ellipsoidal light curves, passive-state data should be used in future studies of ellipsoidal variability.

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