Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7811r&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #78.11; Bulletin of the American Astronomical Society, Vol. 26, p.1443
Astronomy and Astrophysics
Astrophysics
Scientific paper
Astrophysical opacities incorporating more accurate treatments of M shell transitions in heavy elements at ~ 10(5.5) K have recently become available; these have made significant changes to models for a number of stellar astrophysics problems. Neutron stars, which have Teff in this range for ~ 10(6) y and may have surfaces dominated by heavy elements, represent a case where the new opacities should have a maximal effect. We present calculations of LTE neutron star atmospheres and emergent spectra for low B stars in the range 10(5) < Teff < 10(6.5) , using new Fe opacities produced by the OPAL group. The results are compared with earlier models based on Los Alamos Opacity Library data. We find that the photospheres are convective in certain regions for some Teff, and that this, as well as the surface composition, can have a significant effect on the atmospheric fluxes in the UV to soft X-ray range. We comment on the implications for soft X-ray observations of young cooling neutron stars.
Rajagopal Mohan
Romani Roger W.
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