Thermal emission from low-field neutron stars
Universitäts-Sternwarte Göttingen, Geismarlandstr. 11, 37083 Göttingen, Germany
2 Physics Department, Stanford University, Stanford, CA 94305-4060, USA
Corresponding author: B. T. Gänsicke, firstname.lastname@example.org
Accepted: 25 February 2002
We present a new grid of LTE model atmospheres for weakly magnetic ( G) neutron stars, using opacity and equation of state data from the OPAL project and employing a fully frequency- and angle-dependent radiation transfer. We discuss the differences from earlier models, including a comparison with a detailed NLTE calculation. We suggest heating of the outer layers of the neutron star atmosphere as an explanation for the featureless X-ray spectra of RX J1856.5–3754 and RX J0720.4–3125 recently observed with Chandra and XMM.
Key words: stars: neutron / stars: atmospheres / radiative transfer / radiation mechanisms: thermal
© ESO, 2002