Distance Measurements and the X-Ray Luminosity of SCO X-1

Details Distance Measurements and the X-Ray Luminosity of SCO X-1 Distance Measurements and the X-Ray Luminosity of SCO X-1

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.1510b&link_type=abstract

American Astronomical Society, HEAD meeting #4, #15.10; Bulletin of the American Astronomical Society, Vol. 31, p.713

Astronomy and Astrophysics

Astronomy

Scientific paper

We have measured the trigonometric parallax of Sco X-1 as 0.00036'' +/- 0.00004'' which corresponds to a distance of 2.8 +/- 0.3 kpc. This distance is 40% farther away than previous estimates based on X-ray luminosity. We have observed this z-source with the RXTE in the horizontal, normal, and flaring branches and at the normal-flaring branch vertex. Our measured luminosity of 2.3 x 10(38) : ergs : s(-1) at the normal-flaring branch vertex and determined distance supports the hypothesis that Sco X-1 radiates at the Eddington luminosity at this point in its X-ray color-color diagram.

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