Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302....1p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 1, 1986, p. 1-10.
Astronomy and Astrophysics
Astrophysics
31
Neutron Stars, Relativistic Effects, Stellar Envelopes, Stellar Models, Stellar Structure, Electron Scattering, Stellar Luminosity, Temperature Dependence, X Ray Sources
Scientific paper
Models of static, extended, neutron star envelopes are calculated numerically, and a simple analytical approximation of their structure is given. Such envelopes may exist over a range of neutron star luminosities with (L-infinity/L-E) in the range from 0.7 to 1 if the effects of general relativity and temperature dependence of electron scattering are taken into account. Both effects are shown to be essential for the structure of extended envelopes. Most of the envelope mass is confined to a layer only a few meters thick, while there is very little mass in the extended part, which may be over 100 km thick. The whole envelope is in a radiative equilibrium. In the extended part the luminosity is smaller than the local critical luminosity by only one part in 10,000, and the ratio of gas pressure to the total pressure is only 0.0001. These models may be applicable to some X-ray bursts which show evidence for radius expansion. Observations of such bursts may be used, in principle to estimate masses and radii of neutron stars independent of their distances.
Anderson Neesha
Paczyński Bohdan
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