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TYC 3184-1891-1


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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.

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Osservazione e dati astrometrici

Costellazione:Cigno
Ascensione retta:21h42m57.05s
Declinazione:+38°11'04.2"
Magnitudine apparente:8.172
Distanza:98.522 parsec
Moto proprio RA:-71.4
Moto proprio Dec:-58.3
B-T magnitude:8.906
V-T magnitude:8.233

Cataloghi e designazioni:
Nomi esatti   (Edit)
TYCHO-2 2000TYC 3184-1891-1
USNO-A2.0USNO-A2 1275-16341731
HIPHIP 107218

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