Cygnus X-1-a Spectroscopic Binary with a Heavy Companion ?

Details Cygnus X-1-a Spectroscopic Binary with a Heavy Companion ? Cygnus X-1-a Spectroscopic Binary with a Heavy Companion ?

Jan 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972natur.235...37w&link_type=abstract

Nature, Volume 235, Issue 5332, pp. 37-38 (1972).

Physics

165

Scientific paper

WE have reported1 that the spectrum, colours and interstellar features in the star HD 226868, which is coincident with the X-ray star Cygnus X-1 and a radio star2,3, were those of a normal BOIb supergiant. We made measurements of the radial velocity of the star from August 1971 to October 1971 and find it to be a velocity variable, whose changes of velocity correlate with changes in the X-ray flux.

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