FGS observations of two high-velocity stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stellar Motions, Hubble Space Telescope, Star Distribution, Stellar Parallax, Trigonometric Functions, Astrometry, Spatial Distribution, Galaxies

Scientific paper

The HST Fine Guidance System has been used to obtain precise astrometry in the fields of two stars of large space velocity: R 50 = G 166-37 and W 624 - G 16-25. The measures indicate a relative trigonometric parallax for R50 of 4.0 mas, which implies a space velocity in the galactocentric rest frame of 467 km/s. The derived parallax for W 624 is probably about 3.0 mas, but there is a large uncertainty.

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