Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..339v&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 15, 1986, p. 339-349. Research supported by th
Astronomy and Astrophysics
Astronomy
45
Luminosity, Photosphere, X Ray Sources, X Ray Stars, Eddington Approximation, Globular Clusters, Radii
Scientific paper
The analysis of six X-ray bursts from 4U/MXB 1820-30 (one observed in May 1975, and five in March 1976) is presented. In all cases, photospheric contraction during burst decay was observed. The contraction manifests itself as a distinct hardening of the burst spectra, a phenomenon which was previously noted but misinterpreted. The photospheric expansion which must have preceded the contraction takes place in less than one second. The bolometric burst peak luminosities are all near the Eddington limit. This burst source has the best-known distance of all burst sources. These results are therefore of particular interest because of the many reports of super-Eddington burst peak luminosities from sources whose distances are not so well known.
Lewin Walter H. G.
Paradijs Jan van
Vacca William D.
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