The X-Ray Spectral Changes of Scorpius X-1

Details The X-Ray Spectral Changes of Scorpius X-1 The X-Ray Spectral Changes of Scorpius X-1

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...592..486b&link_type=abstract

The Astrophysical Journal, Volume 592, Issue 1, pp. 486-497.

Astronomy and Astrophysics

Astronomy

19

Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Individual: Constellation Name: Scorpius X-1, Stars: Neutron, X-Rays: Binaries

Scientific paper

Rossi X-Ray Timing Explorer (RXTE) observations of Sco X-1 during 1997-1999 have been analyzed for spectral characteristics. All the X-ray branches of Sco X-1 were observed during these epochs. On the basis of our observations, we present a simple model for the behavior of Sco X-1 as a function of accretion rate and angle of the observer's line of sight that explains quantitatively the results of VLBA and RXTE observations. Our model presents a unified view of bright low-mass X-ray binaries as an accretion-driven system in which, at the Eddington accretion rate, material overflows the magnetosphere of the neutron star and quenches the jets of Sco X-1. We present supporting evidence of absorption as a function of X-ray branch. The model explains the two distinct color diagrams of observed Z source horizontal branches as variations in the observed line of sight to the accretion disk. The model also applies to the recently discovered Z traces in atoll sources.

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