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FGS Observations of Two High-Velocity Stars

Osborn, Wayne; MacConnell, D. J.

The Hubble Space Telescope 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 R 50 of 4.0 mas, which implies a space velocity in the galactocentric rest frame of 467 km/sec. The derived p…

The Outer Atmospheres of Cool, Low Gravity Stars as Revealed by HST

Carpenter, Kenneth G.

We have used the Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) to measure the macroturbulent and flow velocities, the acceleration of winds, and the amount of hot (transition-region) plasma in the outer atmospheres of Carbon and K - M Giant/Supergiant stars. We see the acceleration of the stellar winds in the chro…