Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121..259h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 2, May 1983, p. 259-264.
Astronomy and Astrophysics
Astrophysics
25
Gamma Ray Bursts, Neutron Stars, Stellar Gravitation, Stellar Mass Accretion, Stellar Models, Abundance, Helium, Hydrogen, Mathematical Models, Stellar Temperature
Scientific paper
The use of Hansen's (1978) diffusion coefficient has reduced metallicities by two to three orders of magnitude in the present study of the possibility of the occurrence of hydrogen-helium flashes at the surface of accreting neutron stars, which takes into account heavy element depletion due to sedimentation. The abundance profile is found to be Rayleigh-Taylor unstable under the influence of a mean molecular weight gradient when there is no magnetic field, in which case metallicity is reduced. The minimum hydrogen flash-associated accretion rate is of the order of 10 to the -15th solar masses/year per sq km, rendering these neutron stars only marginally detectable in the X-ray emission range by the Einstein satellite.
Bonazzola Silvano
Hameury Jean-Marie
Heyvaerts Jean
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