Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..101l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 101-109.
Astronomy and Astrophysics
Astronomy
45
Ginga Satellite, Magellanic Clouds, Pulsars, X Ray Binaries, Astronomical Satellites, Orbital Elements, Spaceborne Astronomy
Scientific paper
The results of a 2.4-day observations of the binary X-ray pulsar LMC X-4 with the Ginga satellite are reported. A high-quality X-ray spectrum which includes an Fe emission line with an equivalent width of 0.18 keV is presented. Timing analyses of the 13.5 s X-ray pulsations yield a Doppler delay curve, which, in turn, provides the most accurate determination of the LMC X-4 orbital parameters available to date. The phase of the 1.4 day orbit is determined with an accuracy of about 60 s. This phase is combined with four previous determinations of the orbital phase to yield an estimate of the rate of change in the orbital period. An interpretation of this measurement and the known decay rate for the orbit of Cen X-3 is made in the context of tidal evolution. During the observation two very large flares were observed with a duration of about 30 minutes; the source luminosity, at times, exceeded about 5 Eddington luminosities. The flares are described and discussed in some detail.
Corbet Robin
Levine Alan
Nagase Fumiaki
Putney Angela
Rappaport Saul
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