Cygnus X-1 - an interpretation of the spectrum and its variability. Thorne, K. S. & Price, R. H. The Astrophysical Journal Letters, 195:L101–L105, February, 1975.
Cygnus X-1 - an interpretation of the spectrum and its variability [link]Paper  doi  abstract   bibtex   
X-ray observations of Cygnus X-1 are compared with the 'standard' model (accretion disk surrounding a rotating black hole). Attention focuses on the shape of the X-ray spectrum, the fluctuations in X-ray intensity, and the 1971 transition in the spectrum. There are several encouraging agreements of model and data, but a detailed comparison awaits further theoretical and observational studies. Several predictions of the standard model are listed as suggestive guides for future work.
@article{thorneCygnusX1Interpretation1975,
	title = {Cygnus {X}-1 - an interpretation of the spectrum and its variability},
	volume = {195},
	issn = {0004-637X},
	url = {http://adsabs.harvard.edu/abs/1975ApJ...195L.101T},
	doi = {10.1086/181720},
	abstract = {X-ray observations of Cygnus X-1 are compared with the 'standard' model (accretion disk surrounding a rotating black hole). Attention focuses on the shape of the X-ray spectrum, the fluctuations in X-ray intensity, and the 1971 transition in the spectrum. There are several encouraging agreements of model and data, but a detailed comparison awaits further theoretical and observational studies. Several predictions of the standard model are listed as suggestive guides for future work.},
	urldate = {2020-01-24},
	journal = {The Astrophysical Journal Letters},
	author = {Thorne, K. S. and Price, R. H.},
	month = feb,
	year = {1975},
	keywords = {Astronomical Models, Black Holes (Astronomy), Radiant Flux Density, Stellar Evolution, Stellar Rotation, Stellar Spectra, Variable Stars, X Ray Astronomy, X Ray Spectra, X Ray Stars},
	pages = {L101--L105},
}

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