AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 52. White Dwarfs, Neutron Stars and Pulsars
Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southeast Exhibit Hall

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[52.20] The Distance to X-Ray Sources Derived from Hipparcos Observations

L. L. Clark (San Diego State Univ), J. F. Dolan (NASA Goddard SFC)

The parallaxes of eight galactic X-ray sources measured by Hipparcos are significantly different from zero in only two cases, 4U1145-619 (= Cen X-5) and HZ43. The proper motion measured for each of the others, including the Be/neutron star binaries X Per and A0535+26 and the massive X-ray binaries 4U0900-40, 4U1700-37, and Cyg XR-1, is consistent with their spectroscopic parallaxes. There is no evidence from the Hipparcos observations that these X-ray sources are significantly closer than their previously accepted distances.

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