Non-LTE Models for Neutron Star Atmospheres and Supernova-Fallback Disks

Simple item page
dc.creatorWerner, K.
dc.creatorNagel, T.
dc.creatorRauch, T.
dc.creatorSuleimanov, V.
dc.date2006-12-15
dc.date.accessioned2026-07-07T11:00:28Z
dc.date.available2026-07-07T11:00:28Z
dc.descriptionWe describe our recent progress in modeling supernova-fallback disks and neutron star (NS) atmospheres. We present a first detailed spectrum synthesis calculation of a SN-fallback disk composed of iron. We assume a thin disk with a radial structure described by the alpha-disk model. The vertical structure and emission spectrum are computed self-consistently by solving the structure equations simultaneously with the radiation transfer equations under non-LTE conditions. We describe the properties of a specific disk model and discuss various effects on the emergent UV/optical spectrum. We investigate Compton scattering effects on the thermal spectrum of NSs. In addition, we constructed a new generation of metal line-blanketed non-LTE model atmospheres for NSs. It is compared to X-ray burst spectra of EXO0748-676. It is possible that the gravitational redshift, deduced from absorption lines, is lower (z=0.24) than hitherto assumed (z=0.35). Accordingly, this would result in NS mass and radius lower limits of M>1.63Msun and R>13.8 km.
dc.descriptionAccepted for publication in Advances in Space Research
dc.identifierhttps://arxiv.org/abs/astro-ph/0612425
dc.identifierhttp://arxiv.org/abs/astro-ph/0612425
dc.identifierAdv.SpaceRes.40:1512-1516,2007
dc.identifierdoi:10.1016/j.asr.2006.12.023
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187686
dc.subjectAstrophysics
dc.titleNon-LTE Models for Neutron Star Atmospheres and Supernova-Fallback Disks
dc.typetext

Files

Collections

arXiv