Abstract
view Abstract Citations (82) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the Distance to Cygnus X-1 (hd 226868) Bregman, Jesse ; Butler, Dennis ; Kemper, Edward ; Koski, Alan ; Kraft, R. P. ; Stone, R. P. P. Abstract From U, B, V photometry of 104 stars in a field of radius 30' centered on the X-ray binary star Cyg X-1 (HDE 226868), we have studied the color excess E(B - V) as a function of distance. Spectral types were observed de novo for 42 of these stars. We conclude that HDE 226868 cannot be nearer than 1 kpc, and is probably at a distance of 2.5 kpc or more. The primary component is therefore a luminous OB star of mass 30 , and the X-ray component has a minimum mass Subject headings:binaries - black holes - X-ray sources Publication: The Astrophysical Journal Pub Date: November 1973 DOI: 10.1086/181334 Bibcode: 1973ApJ...185L.117B full text sources ADS | data products SIMBAD (2)
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