Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203..196r&link_type=abstract
Astrophysical Journal, vol. 203, Jan. 1, 1976, pt. 1, p. 196-201.
Astronomy and Astrophysics
Astronomy
22
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.
Arnett David. W.
Masters A. R.
Roberts David H.
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