Physical parameters of the high-mass X-ray binary 4U1700-37

  title={Physical parameters of the high-mass X-ray binary 4U1700-37},
  author={J. Simon Clark and S. P. Goodwin and Paul A. Crowther and Lex Kaper and Malcolm Fairbairn and Norbert Langer and C. Brocksopp Ucl and Cardiff and Amsterdam and Bruxelles and Utrecht and Ljmu},
  journal={Astronomy and Astrophysics},
We present the results of a detailed non-LTE analysis of the ultraviolet and optical spectrum of the O6.5 Iaf + star HD 153919 - the mass donor in the high-mass X-ray binary 4U1700-37. We find that the star has a luminosity log(L=L)= 5:82 0:07, Te = 35 000 1000 K, radius R = 21:9 +1:3 0:5 R, mass-loss rate ˙ M = 9:5 10 6 M yr 1 , and a significant overabundance of nitrogen (and possibly carbon) relative to solar values. Given the eclipsing nature of the system these results allow us to… 

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