Evidence that the compact object in SS433 is a neutron star and not a black hole

Details Evidence that the compact object in SS433 is a neutron star and not a black hole Evidence that the compact object in SS433 is a neutron star and not a black hole

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.353..329d&link_type=abstract

Nature (ISSN 0028-0836), vol. 353, Sept. 26, 1991, p. 329-331.

Astronomy and Astrophysics

Astronomy

46

Accretion Disks, Binary Stars, H Lines, Neutron Stars, Stellar Orbits, Black Holes (Astronomy), Radio Jets (Astronomy), Stellar Envelopes

Scientific paper

The unusual galactic object SS433 is believed to be a binary system that emits two oppositely directed precessing jets moving at 0.26c. The jets are produced and controlled by an accretion disk around a compact objects whose nature is still controversial. Spectroscopic observations of the He II line at 4686 A from SS433 are reported and used to deduce a new estimate of the orbital speed of the compact object. Together with the mass ratio of the binary components, derived from X-ray observations, it is found that the compact object is a neutron star, not a black hole. Analysis of the double-peaked profile of the He II line suggests that it is emitted by the accretion disk or its corona, which is partly obscured by an opaque wind from the hot-spot region.

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