Cygnus X-2 - Neutron star or degenerate dwarf?

Details Cygnus X-2 - Neutron star or degenerate dwarf? Cygnus X-2 - Neutron star or degenerate dwarf?

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..794m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 794-800.

Astronomy and Astrophysics

Astronomy

23

Binary Stars, Neutron Stars, Ultraviolet Astronomy, X Ray Stars, Astronomical Photometry, Cygnus Constellation, Dwarf Stars, Interstellar Extinction, Iue

Scientific paper

Some conflicting models have been proposed for Cyg X-2: a degenerate dwarf model which predicts a distance of 250 + or 50 pc; and a neutron star model which implies a distance of about 8000 pc. Based on a reddening study, it is found that the distance to Cyg X-2 is greater than 1100 pc, which rules strongly against the degenerate dwarf model. This conclusion is based on observations of the 2200 A feature in the spectrum of Cyg X-2 made with the International Ultraviolet Explorer (IUE), and UBV and spectroscopic observations of 38 field stars. For the reddening of Cyg X-2 values of E(B-V) = 0.40 + or - 0.07 (1 sigma) are found and are consistent with the reddening to infinity in that direction inferred from radio data. Consequently, Cyg X-2 may be located in the halo at about 8 kpc as proposed in 1979 by Cowley, Crampton, and Hutchings.

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