Geminga's Parallax Revisited

Details Geminga's Parallax Revisited Geminga's Parallax Revisited

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8744p&link_type=abstract

HST Proposal ID #8744

Physics

Hst Proposal Id #8744 Hot Stars

Scientific paper

Measuring distances to neutron stars is extremely important to estimate their radii, with the aid of temperature determined from X-ray/UV observations. The first measurement of the distance to a neutron star, based on HST observations, has been recently reported by Caraveo et al. {1996}, who measured the annual parallax of Geminga, a young, isolated pulsar, active from the radio to gamma-ray wavelengths. However, that result is based on only three WFPC2 observations of four now available, and it does not take into account additional information on the proper motion obtained in recent NICMOS observations. Moreover, the accuracy of the astrometric analysis can be improved significantly, making use of more reliable algorithms for centering point objects in the field and more recent procedures to correct the WFPC2 images for geometric distortion. We propose to use four WFPC2 archival observations and one NICMOS observation to re-analyze both the proper motion and parallax of Geminga. The results will have important consequences for the physics of neutron star interiors, X-ray observations of atmospheres, the history of Geminga, and the origin of the Local Bubble.

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