Contents
Images
Upload your image
DSS Images Other Images
Related articles
Cygnus X-2 - Neutron star or degenerate dwarf? Some conflicting models have been proposed for Cyg X-2: a degeneratedwarf model which predicts a distance of 250 + or 50 pc; and a neutronstar model which implies a distance of about 8000 pc. Based on areddening study, it is found that the distance to Cyg X-2 is greaterthan 1100 pc, which rules strongly against the degenerate dwarf model.This conclusion is based on observations of the 2200 A feature in thespectrum of Cyg X-2 made with the International Ultraviolet Explorer(IUE), and UBV and spectroscopic observations of 38 field stars. For thereddening of Cyg X-2 values of E(B-V) = 0.40 + or - 0.07 (1 sigma) arefound and are consistent with the reddening to infinity in thatdirection inferred from radio data. Consequently, Cyg X-2 may be locatedin the halo at about 8 kpc as proposed in 1979 by Cowley, Crampton, andHutchings.
|
Submit a new article
Related links
Submit a new link
Member of following groups:
|
Observation and Astrometry data
Constellation: | Cygne |
Right ascension: | 21h46m59.84s |
Declination: | +37°58'24.7" |
Apparent magnitude: | 10.193 |
Proper motion RA: | -5.3 |
Proper motion Dec: | -5.1 |
B-T magnitude: | 10.377 |
V-T magnitude: | 10.209 |
Catalogs and designations:
|