HST Astrometry to Gauge the Distance of PSR0833-45 {VELA} and PSR0656+14

Details HST Astrometry to Gauge the Distance of PSR0833-45 {VELA} and PSR0656+14 HST Astrometry to Gauge the Distance of PSR0833-45 {VELA} and PSR0656+14

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8328c&link_type=abstract

HST Proposal ID #8328

Physics

Hst Proposal Id #8328 Hot Stars

Scientific paper

High angular resolution, coupled with sensitivity, makes HST the ideal instrument to measure tiny displacements of faint objects, such as those due to proper motions and annual parallaxes of Isolated Neutron Stars. In this proposal, we first include three exposures of the Vela pulsar aimed at the measure of its parallactic displacement {see GO 6526}. Then we ask for one more exposure of PSR 0656+14, for which one PC observation is already in hand {GO 6136}, to measure its proper motion. The distance values the Vela pulsar is highly disputed and a model-free measurement {or a reliable lower limit} would be very important, e.g., to assess the luminosity of this object at different wavelengths and measure how efficienctly it converts its rotational energy loss in optical, X and gamma radiation.

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