Determining the stellar masses in the binary system containing the pulsar PSR 1913 + 16 - Is the companion a helium main-sequence star

Astronomy and Astrophysics – Astronomy

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Binary Stars, Companion Stars, Pulsars, Relativistic Effects, Stellar Mass, Stellar Rotation, Apsides, Black Holes (Astronomy), Dwarf Stars, Main Sequence Stars, Neutron Stars, Precession, Red Shift, Stellar Gravitation

Scientific paper

The stellar masses and the angle of inclination are determined for the system containing PSR 1913 + 16 in terms of the observable periastron advance and second-order relativistic effects, for the cases (a) in which classical contributions to the apsidal motion are negligible and (b) in which the companion is a helium main-sequence star. In case (b), the apsidal-motion constant is calculated from models of such stars. It is found that, depending on the values obtained for the observable parameters, it may be possible to distinguish between cases (a) and (b). Comment is also made on the further uncertainty in the mass determination which arises if the companion is a rapidly rotating degenerate dwarf or helium main-sequence star. Black holes, neutron stars, degenerate dwarfs, and helium main-sequence stars remain viable candidates for the companion at present.

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