Orbital Parameters for the Soft X-Ray Transient 4U 1543–47: Evidence for a Black Hole

  title={Orbital Parameters for the Soft X-Ray Transient 4U 1543–47: Evidence for a Black Hole},
  author={Jerome A. Orosz and Rajendra Kumar Jain and Charles D. Bailyn and Jeffrey E. McClintock and Ronald A. Remillard The Pennsylvania State University and Yale University and Harvard--Smithsonian Center for Astrophysics and Massachusetts Institute of Technology},
  journal={The Astrophysical Journal},
Spectroscopic observations of the soft X-ray transient 4U 1543-47 reveal a radial velocity curve with a period of P = 1.123 ± 0.008 days and a semiamplitude of K2 = 124 ± 4 km s-1. The resulting mass function is f(M) = 0.22 ± 0.02 M☉. We classify the secondary star as A2 V, in agreement with previous work, and measure Teff = 9000 ± 500 K and E(B-V) = 0.50 ± 0.05 from fits to synthetic spectra. We derive a distance of d = 9.1 ± 1.1 kpc if the secondary is on the main sequence. We see no emission… 

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