Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6642f&link_type=abstract
HST Proposal ID #6642
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #6642 Hot Stars
Scientific paper
We propose WFPC2 imaging of four white dwarf companions to binary neutron stars for use in radio/optical frame tie measurements. Multiple exposures spaced by several minutes will permit detection of variability due to rotation or pulsation of the white dwarf. Most critically, the astrometry will enable us to measure the rotation of the optical reference frame relative to the radio and dynamical reference frames made from independent pulsar observations. These observations will have direct ties with on going radio pulsar timing experiments and planned very long baseline interferometry observations using the VLBA. As an added benefit the astrometric observations can be used with a second set of observations two Cycles later to measure proper motion of the white dwarfs. Proper motion observations can be used to distinguish between supernova and accretion induced collapse models for the two white-dwarf millisecond pulsars, and provide improved astrometry for all four white dwarf pulsar systems.
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