Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277l..57l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. L57-L60.
Astronomy and Astrophysics
Astrophysics
67
Neutron Stars, Photosphere, Stellar Activity, Stellar Radiation, X Ray Sources, Red Shift, Stellar Temperature
Scientific paper
The authors reported earlier two "fast transient" events with "precursors" of a few seconds duration separated from the "main" events by a few seconds. The origin of the precursors is unexplained to date. It is proposed that these events are due to a strong type I X-ray burst and that the observed burst profiles result from an expansion and subsequent contraction of the neutron star's photosphere. During the 1977 February 7 event, the photosphere expanded in about 4 s to a radius at least an order of magnitude larger than the neutron star's original radius. The subsequent contraction of the photosphere occurred on an approximately 50 s time scale. The gravitational redshift should change continuously during expansion and contraction.
Basinska Ewa M.
Lewin Walter H. G.
Vacca William D.
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