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Testing Metal Poor Stellar Models and Isochrones with HST Parallaxes of Metal Poor Stars
B. Chaboyer, B. E. McArthur, E. O'Malley +7
Hubble Space Telescope (HST) fine guidance sensor observations were used to obtain parallaxes of eight metal-poor ([Fe/H] < -1.4) stars. The parallaxes of these stars determined by…
The Frequency of Rapid Rotation Among K Giant Stars
Joleen K. Carlberg, Steven R. Majewski, Richard J. Patterson +3
We present the results of a search for unusually rapidly rotating giant stars in a large sample of K giants (~1300 stars) that had been spectroscopically monitored as potential tar…
Astrometry with the Hubble Space Telescope: Trigonometric Parallaxes of Planetary Nebula Nuclei: NGC 6853, NGC 7293, Abell 31, and DeHt 5
G. Fritz Benedict, Barbara E. McArthur, Ralf Napiwotzki +6
We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This…