An eclipsing millisecond pulsar in the globular cluster Terzan 5

Details An eclipsing millisecond pulsar in the globular cluster Terzan 5 An eclipsing millisecond pulsar in the globular cluster Terzan 5

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.347..650l&link_type=abstract

Nature (ISSN 0028-0836), vol. 347, Oct. 18, 1990, p. 650-652. Research supported by CNR and MPI.

Computer Science

116

Eclipsing Binary Stars, Globular Clusters, Pulsars, Stellar Orbits, Companion Stars, Electromagnetic Scattering, Millimeter Waves, Stellar Winds, Temporal Distribution

Scientific paper

An eclipsing binary millisecond pulsar has been discovered in the globular cluster Terzan 5. This, the second known eclipsing binary pulsar after PSR1957 + 20, has a pulse period of 11.56 ms and a very short orbital period of 1.8 hr. In contrast to PSR1957 + 20, the eclipse duration is very variable and never less than one third of the orbital period. The pulsar is in a circular orbit of radius 0.11 light seconds, which implies a minimum companion mass of 0.089 solar, about four times the companion mass of PSR1957 + 20. Timing observations suggest an identification of the pulsar with a variable continuum source located about 30 arcsec west of the cluster center. The eclipse is due to absorption or scattering in a tenuous wind flowing from the companion star.

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