Ultraviolet spectroscopy of V1341 Cygni /equals Cygnus X-2/

Details Ultraviolet spectroscopy of V1341 Cygni /equals Cygnus X-2/ Ultraviolet spectroscopy of V1341 Cygni /equals Cygnus X-2/

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..354c&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 354-362.

Astronomy and Astrophysics

Astronomy

8

Binary Stars, Stellar Spectra, Ultraviolet Astronomy, X Ray Stars, Absorption Spectra, Bremsstrahlung, High Temperature Plasmas, Iue, Stellar Mass Accretion

Scientific paper

Cyg X-2 is a low-mass X-ray binary of orbital period P = 9d.8. Several IUE spectra in the 1200-3000 Å range are examined. Variability up to a factor of 2 is apparent. A discussion of the emission-line spectrum yields estimates of the temperature (T ≈ 2×104K), density (n ≈ 2×1010 cm-3), and radius (r ≈ 5×1012 cm) of the line-emission region. Two processes may contribute to the UV emission. One is reprocessing of X-rays in the accretion disk. The other process is bremsstrahlung of a hot plasma producing the X-rays. A comparison with Sco X-1, whose similarity with Cyg X-2 has been noted, suggests that the two processes are likely to coexist.

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