An Orbital Light-Curve Model for GX 301-2

Details An Orbital Light-Curve Model for GX 301-2 An Orbital Light-Curve Model for GX 301-2

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...554..383p&link_type=abstract

The Astrophysical Journal, Volume 554, Issue 1, pp. 383-390.

Astronomy and Astrophysics

Astronomy

27

Stars: Pulsars: Individual: Alphanumeric: Gx 301-2, Stars: Individual: Alphanumeric: Gx 301-2, Stars: Neutron, X-Rays: Stars

Scientific paper

We present the results of X-ray observations of GX 301-2 with instruments aboard the ASCA and RXTE spacecraft, as well as analysis of archival data from BATSE/CGRO and the All-Sky Monitor on RXTE. We discuss evidence that (1) GX 301-2 has changed its spin state, perhaps entering a stochastic spin state similar to 1974-1984 (2) epochal changes occur in the constant and flaring components of the orbital light curve-a 25% increase in the overall luminosity is coincident with the changed spin state and is due to an increase in the constant component accompanied by a decrease in the near-apastron flare; and (3) the orbital light curve, in general, and timing of the preperiastron flare, in particular, can be understood as a latency effect in the GX 301-2 accretion disk.

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