GX 339-4 - Black hole or neutron star X-ray binary?

Details GX 339-4 - Black hole or neutron star X-ray binary? GX 339-4 - Black hole or neutron star X-ray binary?

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..195c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, Jan. 1987, p. 195-199. NSF-supported research.

Astronomy and Astrophysics

Astronomy

33

Black Holes (Astronomy), Emission Spectra, Line Spectra, Neutron Stars, Stellar Mass Accretion, X Ray Binaries, Cross Correlation, Stellar Luminosity, Stellar Mass, Stellar Motions, Stellar Orbits

Scientific paper

Optical spectra of the highly variable X-ray source GX 339-4 show an emission-line spectrum characteristic of an accretion disk. Velocity variations suggest the orbital period lies between 0.2 and 2 days. Periods in this range limit the mass of the compact star to <2.5 M_sun;. The distance estimated from the interstellar lines and the color is ≡4 kpc. At this distance the velocity expected from galactic rotation differs by over 100 km s-1 from the observed systemic velocity.

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