High-Resolution Parallax Measurements of Scorpius X-1

Details High-Resolution Parallax Measurements of Scorpius X-1 High-Resolution Parallax Measurements of Scorpius X-1

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...512l.121b&link_type=abstract

The Astrophysical Journal, Volume 512, Issue 2, pp. L121-L124.

Astronomy and Astrophysics

Astronomy

70

Astrometry, Radio Continuum: Stars, Stars: Individual: Constellation Name: Scorpius X-1, Techniques: Interferometric, X-Rays: Stars

Scientific paper

The results of eight VLBA observations at 5 GHz, spanning 3 yr, have yielded a measured trigonometric parallax for Sco X-1 of 0.00036"+/-0.00004" hence, its distance is 2.8+/-0.3 kpc. This is the most precise parallax measured to date. Although our measured distance is 40% farther away than previous estimates based on X-ray luminosity, our Rossi X-Ray Timing Explorer observations, with a measured luminosity of 2.3x10^38 ergs s^-1, and determined distance continue to support the hypothesis that Z-source low-mass X-ray binary systems, like Sco X-1, radiate at the Eddington luminosity at a particular point in their X-ray color-color diagram.

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