HST-FGS parallaxes of two high-velocity stars.

Details HST-FGS parallaxes of two high-velocity stars. HST-FGS parallaxes of two high-velocity stars.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1268m&link_type=abstract

Astronomical Journal v.114, p. 1268-1275 (1997)

Astronomy and Astrophysics

Astronomy

2

Astrometry

Scientific paper

Astrometric position measurements with the Hubble Space Telescope's Fine Guidance System have been used to measure the trigonometric parallaxes of two high-velocity stars, R50 = G166-37 and W624 = G16-25. In both cases, the parallaxes are small and confirm large velocities in the galactocentric rest frame. We derive pi_ {abs} = 5.2 +/- 0.7 mas and vrf = 467 kms for R50. The results for W624 are pi_ {abs} = 3.8 +/- 1.0 and vrf = 326 kms with an uncertainty of about 30%. Our results support a value for the galactic escape velocity at the solar distance of about 475 kms.

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