Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..433z&link_type=abstract
Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Calculations carried out to model the evolution of HDE 226868, under different assumptions about the stellar wind mass loss rate, provide robust limits on the present mass of the star. It has to be in the range 35 ÷ 55 M if the distance to the system is in the range 1.8 to 2.35 kpc. Including into the analysis observational properties such as the profiles of the emission lines, rotational broadening of the absorption lines and the ellipsoidal light variations, one can further narrow the range of the permitted masses to ˜ 40 ÷ 55 M . The same analysis (using the evolutionary models and the observational prop- erties listed above) limits the mass of the compact component to the range of ˜ 16 ÷ 30 M and yields lower limit to the distance to the system of ˜ 2.0 kpc. This limit to the distance does not depend on any photometric or astrometric considerations. Key words: binaries: general X-ray sources evo- lution; stars: individual (Cyg X-1) masses of the components.
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