Discovery of orbital decay in SMC X-1

Details Discovery of orbital decay in SMC X-1 Discovery of orbital decay in SMC X-1

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9223531l&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Binary Stars, Neutron Stars, Orbit Decay, Pulsars, Unsteady Flow, X Ray Stars, Daytime, Decay Rates, Flight Mechanics, Orbital Mechanics, Stellar Evolution, Tides, X Ray Astronomy

Scientific paper

The results are reported of three observations of the binary X ray pulsar SMC X-1 with the Ginga satellite. Timing analyses of the 0.71 s X ray pulsations yield Doppler delay curves which, in turn, provide the most accurate determination of the SMC X-1 orbital parameters available to date. The orbital phase of the 3.9 day orbit is determined in May 1987, Aug. 1988, and Aug. 1988 with accuracies of 11, 1, and 3.5 s, respectively. These phases are combined with two previous determinations of the orbital phase to yield the rate of change in the orbital period: P sub orb/P sub orb = (-3.34 + or - 0.023) x 10(exp -6)/yr. 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. Finally, a discussion is presented of the relation among the stellar evolution, orbital decay, and neutron star spinup time scales for the SMC X-1 system.

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