X-ray spectrum and iron line emission from Cygnus X-1

Details X-ray spectrum and iron line emission from Cygnus X-1 X-ray spectrum and iron line emission from Cygnus X-1

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42...85k&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 1, 1990, p. 85-97.

Astronomy and Astrophysics

Astronomy

21

Black Holes (Astronomy), Cygnus Constellation, Emission Spectra, Iron, X Ray Sources, X Ray Spectra, Spectral Line Width, Stellar Orbits, Stellar Winds, Supergiant Stars

Scientific paper

X-ray spectra from Cygnus X-1 were observed with Tenna in September 1983. An emission line around 6.5 keV with an equivalent width of about 60-80 eV was found during the observations, except for the phase near the superior conjunction of the X-ray star, where a weak (equivalent width less than 38 eV) or broad iron line was suggested. The absorption column density determined from the low-energy cut off shows significant change with a 5.6-day orbital period. This feature is explained by the stellar wind of the primary star.

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