Possible spurious eccentricity and distorted X-ray velocity curve in 3U0900-40

Details Possible spurious eccentricity and distorted X-ray velocity curve in 3U0900-40 Possible spurious eccentricity and distorted X-ray velocity curve in 3U0900-40

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....52..157m&link_type=abstract

Astronomy and Astrophysics, vol. 52, no. 1, Oct. 1976, p. 157-160. Research supported by the U.S.-Israel Binational Science Fou

Astronomy and Astrophysics

Astrophysics

11

Binary Stars, Eccentric Orbits, Pulsars, X Ray Sources, Doppler Effect, Error Analysis, Orbit Calculation, Stellar Motions, Velocity Distribution

Scientific paper

The X-rays reflected from the surface of the primary in 3U 0900-40 and other slow X-ray pulsars can shift the pulse arrival times significantly. This may lead to systematic errors in the derived orbital parameters and generate a large fraction of the observed eccentricity. Observational tests for this hypothesis are suggested. The eccentricity of 3U 0900-40 may be almost all spurious, in which case all X-ray binary orbits may be essentially circular.

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