Evidence for the degenerate dwarf nature of Cygnus X-2

Details Evidence for the degenerate dwarf nature of Cygnus X-2 Evidence for the degenerate dwarf nature of Cygnus X-2

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l.153b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Feb. 1, 1980, p. L153-L157. Research supported by the John Simo

Astronomy and Astrophysics

Astronomy

44

Oao 3, Radiant Flux Density, Stellar Mass Accretion, White Dwarf Stars, X Ray Sources, Cygnus Constellation, Spaceborne Astronomy, Stellar Luminosity

Scientific paper

Observations of Cygnus X-2 using the Copernicus satellite have revealed a novel relationship between the spectral hardness and the intensity of this source in the 3-8 keV band. This behavior is very similar to that predicted for a spherically accreting nonmagnetic degenerate dwarf. The data, interpreted in terms of this model, determine solar mass, luminosity, and the distance for Cyg X-2; these parameters are at variance with the values derived from optical observations of the system. The implications of this discrepancy for the understanding of the source are examined.

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