Astronomy and Astrophysics – Astronomy
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191..547p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 191, May 1980, p. 547-558. Research supported by the Science Research C
Astronomy and Astrophysics
Astronomy
49
Binary Stars, Optical Emission Spectroscopy, Pulsars, Stellar Spectra, X Ray Sources, Balmer Series, Emission Spectra, Hydrogen Clouds, Line Shape, Stellar Mass Ejection, X Ray Stars
Scientific paper
Optical spectra of Wray 977 at dispersions of 25 and 33 Å mm-1 have been obtained, and a spectral type of B2 Ia e derived, implying a stellar mass of 25 -3 SMsun. The P-Cygni type emission line profiles in the spectrum indicate that Wray 977 has an extended, expanding atmosphere, and velocity progressions in the Balmer and strong He I series indicate that the atmosphere is also accelerating. The mass loss rate is probably greater than ˜3 × 10-6 Msun yr-1. A distance of 1.8 ± 0.4 kpc is derived implying that the average X-ray luminosity of 4U 1223-62 is ˜1036 erg -1. The study has shown that the profiles of spectral features are constant from day to day, contrary to the report of Vidal. The models are discussed.
Culhane Leonard J.
Mason Keith O.
Murdin P. G.
Parkes G. E.
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