The Distance to X-Ray Sources Derived from HIPPARCOS Observations

Details The Distance to X-Ray Sources Derived from HIPPARCOS Observations The Distance to X-Ray Sources Derived from HIPPARCOS Observations

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5220c&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #52.20; Bulletin of the American Astronomical Society, Vol. 31, p.905

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Scientific paper

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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