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Measuring the basic parameters of neutron stars using model atmospheres
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. University of Turku, Finland.
2016 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 52, no 2, 20Article in journal (Refereed) PublishedText
Abstract [en]

Model spectra of neutron star atmospheres are nowadays widely used to fit the observed thermal X-ray spectra of neutron stars. This fitting is the key element in the method of the neutron star radius determination. Here, we present the basic assumptions used for the neutron star atmosphere modeling as well as the main qualitative features of the stellar atmospheres leading to the deviations of the emergent model spectrum from blackbody. We describe the properties of two of our model atmosphere grids: i) pure carbon atmospheres for relatively cool neutron stars (1-4MK) and ii) hot atmospheres with Compton scattering taken into account. The results obtained by applying these grids to model the X-ray spectra of the central compact object in supernova remnant HESS 1731-347, and two X-ray bursting neutron stars in low-mass X-ray binaries, 4U 1724-307 and 4U 1608-52, are presented. Possible systematic uncertainties associated with the obtained neutron star radii are discussed.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2016. Vol. 52, no 2, 20
Keyword [en]
Equation-Of-State, X-Ray-Bursts, Mass-Radius Relation, Central Compact Objects, Supernova Remnant, Stellar Atmospheres, Spectral Evolution, Compton-Scattering, Radiation Spectra, Globular-Clusters
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-187850DOI: 10.1140/epja/i2016-16020-7ISI: 000375217500002ScopusID: 2-s2.0-84957810668OAI: oai:DiVA.org:kth-187850DiVA: diva2:931756
Note

QC 20160530

Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2016-05-30Bibliographically approved

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Poutanen, Juri
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Nordic Institute for Theoretical Physics NORDITA
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