On spectra of X-ray bursters in the expansion phase

Details On spectra of X-ray bursters in the expansion phase On spectra of X-ray bursters in the expansion phase

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377l..93l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. L93-L96. Research supported by Scuola Inte

Astronomy and Astrophysics

Astrophysics

6

Globular Clusters, Neutron Stars, Radiative Transfer, Stellar Atmospheres, Stellar Spectra, X Ray Binaries, Exosat Satellite, Satellite Observation, Spectrum Analysis, Stellar Mass Ejection, Transfer Functions

Scientific paper

Two alternative approaches to the theoretical description of spectra of X-ray bursters showing radial expansion near the light curve maximum are presented. The first one, using the LTE assumption, can be used to explain the noticeable soft excess which is present in corresponding Exosat observations. The second one is based on numerical calculations of radiation transfer and provides not only the qualitative scenario of the drastic softening of spectra as the expansion occurs, but also the ratio of maximum values of Planckian fitting temperatures which seems to be quite a good estimate for the value observed in 4U/MXB 1820-30. The double-peaked structure of bursts with expansion is also a natural consequence of the scenario presented.

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