Contingut
Imatges
Carregar la teva Imatge
DSS Images Other Images
Articles Relacionats
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.
| Stars with large Proper Motions in the Hyderabab Astrographic zones + 36° to + 39° (Final list)
Not Available
|
Enviar un nou article
Enllaços Relacionats
- - No s'ha trobat enllaços -
Enviar un nou enllaç
Membre dels grups següents:
|
Dades d'Observació i Astrometria
| Constel·lació: | Cygnus |
| Ascensió Recta: | 21h42m56.11s |
| Declinació: | +37°54'17.7" |
| Magnitud Aparent: | 7.433 |
| Distancia: | 178.571 parsecs |
| Moviment propi RA: | 42.3 |
| Moviment propi Dec: | 16 |
| B-T magnitude: | 7.729 |
| V-T magnitude: | 7.458 |
Catàlegs i designacions:
|
