Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..210t&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 210-216.
Astronomy and Astrophysics
Astrophysics
77
Carbon, Neutron Stars, Nuclear Fusion, Stellar Envelopes, Stellar Evolution, Stellar Mass Accretion, Abundance, Nuclear Astrophysics, Stellar Models, Stellar Structure
Scientific paper
This paper reports on detailed calculations of the thermal evolution of the carbon-burning shells in the envelopes of accreting neutron stars for mass-accretion rates of 1 hundred-billionth to 2 billionths of a solar mass per yr and neutron-star masses of 0.56 and 1.41 solar masses. The work of Hansen and Van Horn (1975) is extended to higher densities, and a more detailed treatment of nuclear processing in the hydrogen- and helium-burning regions is included. Results of steady-state calculations are presented, and results of time-dependent computations are examined for accretion rates of 3 ten-billionths and 1 billionth of solar mass per yr. It is found that two evolutionary sequences lead to carbon flashes and that the carbon abundance at the base of the helium shell is a strong function of accretion rate. Upper limits are placed on the accretion rates at which carbon flashes will be important.
Picklum R. E.
Taam Ronald E.
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