Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..683s&link_type=abstract
Astrophysical Journal, Part 1, vol. 258, July 15, 1982, p. 683-695.
Astronomy and Astrophysics
Astrophysics
16
Neutron Stars, Stellar Envelopes, Stellar Evolution, Stellar Mass Accretion, Thermonuclear Reactions, X Ray Sources, Computer Techniques, Hydrodynamics, Hydrogen Clouds, Periodic Variations, Radii, Stellar Luminosity, Stellar Models, Stellar Temperature
Scientific paper
A Lagrangian, fully implicit, one-dimensional hydrodynamic computer code is used to investigate the evolution of thermonuclear runaways in the thick accreted hydrogen-rich envelopes of 1.0-solar-mass neutron stars having radii of 10 km and 20 km. The simulations produce outbursts that range in time scale from about 2000 seconds to more than a day. For the 10-km study, the peak effective temperature is 3.3 x 10 to the 7th K, and the peak luminosity is 2 x 10 to the 5th solar luminosities. The 20-km neutron star produces a peak effective temperature and luminosity of 5.3 x 10 to the 6th K and 5.9 x 10 to the 2nd solar luminosities. Also investigated are the effects of changes in the rates of the O-14(alpha, proton) and O-15(alpha, gamma) reactions on the evolution. Hydrodynamic expansion on the 10-km neutron star produces a precursor lasting about 10 to the -6th sec. The evolution of a gas cloud impacting the surface of a 20-km, 1-solar-mass neutron star is studied in an attempt to simulate the magnetospheric gate model of the X-ray burst sources.
Kenyon Scott
Sparks Warren M.
Starrfield Summer
Truran Jame. W.
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