Spectral evolution of a burst from MXB 1728-34 and constraints on burster parameters

Details Spectral evolution of a burst from MXB 1728-34 and constraints on burster parameters Spectral evolution of a burst from MXB 1728-34 and constraints on burster parameters

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...220..117k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 220, no. 1-2, Aug. 1989, p. 117-127.

Astronomy and Astrophysics

Astrophysics

11

Neutron Stars, Stellar Spectra, X Ray Spectroscopy, Black Body Radiation, Bremsstrahlung, Photosphere, Wave Scattering

Scientific paper

The spectral evolution of a powerful burst from the X-ray burster MXB 1728-34 has been analyzed by fitting its spectra in consecutive time intervals with black-body (BB), isothermal scattering photosphere (SP), and thermal bremsstrahlung (TB) models. It is found that around the burst maximum (the first 4 seconds), the SP model fits the data best and the TB hypothesis is statistically inacceptable. In the burst tail, the BB hypothesis is generally worse than the two others. Analysis of the data around the burst maximum in terms of an isothermal SP yields constraints on the neutron star mass (1.4-2 solar masses), radius (6.5-12 km), and distance to the burster (6 kpc).

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