The Spectrum of HDE 226868 (=CYGNUS X-1)
Abstract
A refined spectral classification of 09.7 lab (p-var) has been derived for the supergiant star associated with the X-ray source Cyg X-1. The blue-violet absorption-line spectrum is entirely normal; however, a peculiar, variable emission line is present at He ii x4686. Two spectrograms of the star are illustrated. Subject headings: stars, individual - X-ray sources
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1973
- DOI:
- 10.1086/181131
- Bibcode:
- 1973ApJ...179L.123W