Other
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pazh...14...37k&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 14, Jan. 1988, p. 37-48. In Russian. In Russian. In Russian.
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1
Neutron Stars, Spectrum Analysis, Thomson Scattering, X Ray Spectra, Bursts, Photosphere, Stellar Flares
Scientific paper
Spectral evolution is investigated and interpretations of the spectra are considered for a burst from the X-ray burster MXB 1728-34 detected by ASTRON. Interpretation of the spectra around the burst maximum (first ≅4s) in terms of radiation from an isothermal neutron star (NS) photosphere with dominating role of Thomson scattering leads to the conclusion that the photosphere expands up to several tens of kilometers in the burst maximum. The luminosity remains close to the Eddington limit during expansion and contraction; maxima of the observed flux corresponding to minima of the luminosity due to general relativity effects. The burst tail spectra are close to those of thermal bremsstrahlung. Such spectra might originate in a corona around NS with mass ≡10-16M_sun;, radius ≡100 km and electron density ≡1019cm-3, or in a hot layer with thickness ≡1 - 10 g cm-2 on the photosphere surface.
Kaminker A. D.
Kopaeve I. F.
Kurt Victoria G.
Pavlov George G.
Shamolin V. M.
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