Binary Pulsar PSR:1718-19 Contains a Stripped Main-Sequence Turn-Off Star

Details Binary Pulsar PSR:1718-19 Contains a Stripped Main-Sequence Turn-Off Star Binary Pulsar PSR:1718-19 Contains a Stripped Main-Sequence Turn-Off Star

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264l...3z&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 264, NO. 1/SEP1, P. L3, 1993

Astronomy and Astrophysics

Astronomy

9

Binaries: Close - Binaries: Eclipsing - Pulsars: Individual: Psr 1718-19

Scientific paper

Lyne et al. have recently announced the discovery of a 1-s globular cluster pulsar, 1718- 19, in a 6.2-h binary system which is embedded in a cloud of material originating from the companion star. The incident flux of the pulsar radiation on the companion, however, is too low to ablate it, and a main-sequence companion would be too small to fill its Roche lobe. Here I argue that the companion is a stripped turnoff star of mass 0.2-0.4 Msun, with a helium core of ≍0.1 Msun, and a radius a factor of 1.8 larger than that of a main-sequence star of equal mass. Its position in the Hertzsprung-Russell diagram overlaps that of a ˜0.65-Msun main-sequence star. The evolutionary state of the companion and the highly magnetized slowly rotating neutron star place the system on the verge of the low-mass X-ray binary phase.

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