Other
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..332..416h&link_type=abstract
The Fate of the Most Massive Stars, ASP Conference Series, Vol. 332, Proceedings of the conference held 23-28 May, 2004 in Grand
Other
2
Scientific paper
We have been using the Keck Observatory to obtain phase-resolved spectroscopy of black hole X-ray binaries since 1995. The latest bright X-ray nova, XTE J1118+48, has been observed extensively in November 1999, May 2000 and February 2004. A compilation of all our measured mass functions fM_x and mass ratios q=Mc/Mx are presented in Table 1 which give the mass of the black hole after determination of the binary inclination. The mass is the most important parameter for the black hole and can also be used to constrain the physics of the supernova explosion as well the mass of the progenitor star.
Abnormally-high lithium abundances have only been detected in GS2000+25 (Harlaftis et al. 1996) from our sample of targets though there are detections in three other sources (Cen X-3, A0620- 00, V404 Cyg). The large aperture of the Keck telescopes has also enabled imaging of the accretion disk around the black hole (Harlaftis et al. 1996) and the short period of XTE J1118+48 will perhaps provide the best such diagnostic of the physics around the black hole in the optical band as well as the chemical abundances of the companion star.
Filippenko Alexei
Harlaftis Emilios
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