Temperature dependent variation of pulsar periods

Details Temperature dependent variation of pulsar periods Temperature dependent variation of pulsar periods

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985japa....6..165p&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 6, Sept. 1985, p. 165-169. Sponsorship: Department of Atomic Energy

Astronomy and Astrophysics

Astrophysics

1

Neutron Stars, Periodic Variations, Pulsars, Stellar Temperature, Temperature Dependence, Cooling, Radii, Stellar Models

Scientific paper

A qualitative estimate of the random fluctuations in the radii of neutron stars caused by variations in the temperature were made by means of a mathematical model. It was calculated that possible temperature variations of the order of 10 to the 5th K/yr in the interior of a neutron star could produce daily random frequency variations of the order of 10 to the -10th/s in young pulsars and 10 to the -12th/s in the older long period pulsars, compared to the observed values of 5 x 10 to the -9th/s and 4 x 10 to the -12th/s, respectively. For the millisecond pulsar PSR 1937 + 214, the expected value of random changes in period due to temperature variations was estimated to be 10 to the -12th s/yr, which is two orders of magnitude less than the steady variation due to loss of energy by radiation.

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