Evolution of binaries with a low mass component immersed in a radiation field. I - Effect of irradiation by a millisecond pulsar companion

Details Evolution of binaries with a low mass component immersed in a radiation field. I - Effect of irradiation by a millisecond pulsar companion Evolution of binaries with a low mass component immersed in a radiation field. I - Effect of irradiation by a millisecond pulsar companion

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..219d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 219-230.

Astronomy and Astrophysics

Astrophysics

19

Binary Stars, Pulsars, Stellar Evolution, Stellar Radiation, Radiation Distribution, Stellar Mass, Stellar Temperature

Scientific paper

Results are presented of an investigation of the temporal evolution of low-mass stars when they are placed into a radiation bath of temperature sufficiently close to the stellar Teff to alter their structure. The model proposed by Tout et al. (1989) is adopted, and the structural changes of stars of masses 0.8, 0.5, 0.3, and 0.1 solar mass are followed. The stellar radius increases on a thermal timescale of the star under consideration, even if the radiation bath is not particularly extreme. Particular attention is given to the possible influence of irradiation on the evolution of the detached secondary of a millisecond pulsar (MSP), and the way in which the system will come into contact due to both canonical orbital angular momentum losses and due to the radius expansion induced by irradiation is described. It is concluded that binary MSPs spend most of their lifetime near orbital periods of about 4-6 hr, while the mass of the secondary is reduced to the very small values in a prolonged mass transfer phase at rates so low that accretion on the neutron star can probably be eliminated by a 'propeller' effect.

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