Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.355..703v&link_type=abstract
Nature (ISSN 0028-0836), vol. 355, Feb. 20, 1992, p. 703-705. Research supported by NWO, Leids Kerkhoven-Bosscha Fonds, and NSF.
Astronomy and Astrophysics
Astronomy
177
Emission Spectra, Helium, Infrared Sources (Astronomy), Radio Sources (Astronomy), Wolf-Rayet Stars, X Ray Binaries, Neutron Stars, Stellar Spectra, Stellar Winds
Scientific paper
Recent instrumental improvements have enabled spectral features in the near-IR I and K bands of Cygnus X-3 to be identified. These are found to be characteristic of Wolf-Rayet stars: strong, broad emission lines of He I and He II, but no strong hydrogen lines. These observations strongly suggest the presence of a dense wind in the Cyg X-3 system and may indicate that the companion is a fairly massive helium star, as had been predicted by a model in which the present system is a descendant of a massive X-ray binary.
Charles Phil A.
Geballe Thomas Ronald
King David L.
Miley George K.
Molnar Larry A.
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