Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..327t&link_type=abstract
Astrophysical Journal, Part 1, vol. 233, Oct. 1, 1979, p. 327-333. NSF-NASA-supported research.
Astronomy and Astrophysics
Astrophysics
63
Neutron Stars, Stellar Evolution, Thermonuclear Reactions, Astrophysics, Bursts, Helium, Hydrogen, Stellar Envelopes, Stellar Temperature, Time Dependence
Scientific paper
Thermonuclear runaways which develop when neutron stars of 0.476 solar masses accrete hydrogen-rich material at 10 to the -10th and 2 x 10 to the -9th solar masses/year have been followed using a numerical model. It is found that a thermal instability occurs at densities in excess of 10 to the 5th g/cu cm and that the maximum accumulated mass required to initiate the runaway is 0.7 x 10 to the -12th and 2.1 x 10 to the -12th solar masses for the mass accretion rates of 10 to the -10th and 2 x 10 to the -9th solar masses/year, respectively. Heating the of the neutron star envelope by hydrogen burning leads to the ignition of helium. The nonequilibrium burning of helium by a combination of (alpha, p), (p, gamma), and (alpha, gamma) reactions involving O-14, O-15, and other heavy nuclei provides the energy for an X-ray burst. The gross properties of these models bear suggestive resemblance to those observed for some X-ray burst sources.
Picklum R. E.
Taam Ronald E.
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