Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260l...7d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 2, p. L7-L10.
Other
20
Binary Stars, Globular Clusters, Pulsars, Stellar Mass, Companion Stars, Eccentric Orbits, X Ray Binaries
Scientific paper
We report the discovery of the first binary radio pulsar to possess both a low-mass companion and a substantial orbital eccentricity. PSR B1802-07 is a 23-ms pulsar, located within the core of the globular cluster NGC 6539 and a member of a binary system with an orbital period of 2.6 day and eccentricity of 0.21. Timing observations reveal an advance in the longitude of periastron of 0.06 + 0.01 deg/yr. If the periastron advance is due solely to relativistic effects, the total mass of the system is 1.65 +/- 0.4 solar masses, consistent with a neutron star of mass 1.4 solar masses and a white dwarf companion of mass of 0.3 solar masses. Most pulsar binary systems with low-mass companions have orbits which are extremely circular, due to tidal forces which they experience during the giant phase of their companion's evolution. The eccentricity of the system may have been induced by interactions with other stars of the globular cluster, or may result from incomplete circularization of an initially more eccentric orbit.
Bailes Matthew
D'Amico Nichi
Fruchter Andrew S.
Goss William Miller
Johnston Scott
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