Change of Period in Cygnus X-1

Details Change of Period in Cygnus X-1 Change of Period in Cygnus X-1

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26r.173m&link_type=abstract

XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S

Astronomy and Astrophysics

Astronomy

Scientific paper

Cygnus X-1 is an X-ray binary system composed by a supergiant star (O9.7 Iab) and a presumed black hole with mass of 18 and 10 M_&sun; respectively. A period P of 5.599847+/-0.000018 days has been reported by La Sala et al. (1998, MNRAS, 301, 285). We used our recent observations and previously published data to try to detect variations in the orbital period. Variations in the period are related with changes in the orbital angular momentum caused by the mass loss of the supergiant star. Using our results for the rate of change of period we found a preliminary independent estimate for the mass loss rate of the primary star. We compared our results with those found by Herrero et al. (1995, A&A, 297, 556) using stellar-atmospheres models.

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