The Light Curve of the Companion to PSR J2051-0827

Details The Light Curve of the Companion to PSR J2051-0827 The Light Curve of the Companion to PSR J2051-0827

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510l..45s&link_type=abstract

The Astrophysical Journal, Volume 510, Issue 1, pp. L45-L48.

Astronomy and Astrophysics

Astronomy

14

Stars: Binaries: Eclipsing, Stars: Pulsars: Individual: Alphanumeric: Psr J2051-0827, Stars: Neutron

Scientific paper

We have obtained new photometry of the companion to the eclipsing binary millisecond pulsar PSR J2051-0827. The data are modeled by a gravitationally distorted, low-mass secondary star that is irradiated by the impinging pulsar wind. The best-fit models require that greater than 30% of the incident energy is absorbed by the secondary star and reradiated as optical emission. Unless the companion is significantly farther away than its dispersion measure distance, it underfills its Roche lobe by at least 30%. A small companion makes it difficult to drive a wind from its surface and thus explain the mass loss in the system. Our models show that the system is inclined by more than 30 deg, and thus the companion mass is in the range of 0.025-0.055 M_solar (for a 1.4 M_solar pulsar). The unilluminated side of the companion is cool, with a best-fit temperature of 3000 K.

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