A determination of the orbit of GX 301-2

Details A determination of the orbit of GX 301-2 A determination of the orbit of GX 301-2

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..699k&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 1, 1980, p. 699-709.

Astronomy and Astrophysics

Astronomy

35

Binary Stars, Orbital Elements, Pulsars, Stellar Motions, X Ray Sources, Data Processing, Doppler Effect, Least Squares Method, Sas-3, Spaceborne Astronomy, X Ray Binaries

Scientific paper

The pulse phase of GX 301-2(4U 1223-62) was tracked for 30 days with the SAS 3 satellite during 1979 January and February. It is suggested that most of the observed changes in pulse period are the result of Doppler shifts in a binary orbit, as opposed to changes in the intrinsic pulse period alone. The SAS 3 data allow orbital periods P(orb) equal to or greater than 23 days when a constant rate of change in the intrinsic pulse period is allowed as a free parameter in the orbital fits. For each trial orbital period the other orbital elements of the binary system are well determined. The SAS 3 data is combined with the Ariel 5 pulse arrival-time data to further restrict the allowed orbits. In both data sets a sharp minimum is observed in the Doppler delays of the pulse arrival times. Evidence is presented that the correct orbit is most likely the one with P(orb) = 35.0d, a projected semimajor axis for the neutron star of 304 light-seconds, and an eccentricity of 0.44. The relation of this system to the six X-ray binaries whose orbits have been determined previously is also discussed.

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