Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.251..589c&link_type=abstract
Nature, vol. 251, Oct. 18, 1974, p. 589, 590.
Astronomy and Astrophysics
Astronomy
4
Binary Stars, Black Holes (Astronomy), Interstellar Extinction, O Stars, X Ray Sources, B Stars, Cosmic Dust, Distance, Distance Measuring Equipment, Milky Way Galaxy, Stellar Radiation
Scientific paper
An evaluation of the nature of the X-ray source Cygnus X-1 depends on distance relations. The validity of distance estimates provided by Margon et al. (1973) and Bregman et al. (1973) is considered. It is concluded that the possibility of a determination of the distance of HDE 226868 to the required accuracy on the basis of reddening measurements appears unlikely. It is, therefore, thought to be premature to suggest that the X-ray source is a black hole.
Cheng Chung-Chieh
Phillips Kenneth J. H.
Wilson Margaret A.
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