Optical spectroscopy and system parameters for 4U 1538-52

Details Optical spectroscopy and system parameters for 4U 1538-52 Optical spectroscopy and system parameters for 4U 1538-52

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225l..63c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Oct. 15, 1978, p. L63-L66.

Astronomy and Astrophysics

Astrophysics

35

Binary Stars, Neutron Stars, Optical Emission Spectroscopy, Supergiant Stars, X Ray Sources, Emission Spectra, Helium Ions, Supernovae

Scientific paper

Candidate star 12 of Cowley et al. (1977) is confirmed as the optical counterpart of 4U 1358-52. The star is a heavily reddened (B-V color excess about 2.2 mag) B0 supergiant, with absorption velocities antiphased with the X-ray source and He II 4686-A emission cophased with the X-ray source. Masses of 20 + or - 4 and 2.0 + or - 0.4 solar masses are derived for the components, with an inclination of approximately 70 deg. The He II emission originates near the X-ray source. The system is very similar to SMC X-1. It has a very high systemic velocity which may result from the presumed supernova event that formed the neutron star.

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