AAS 195th Meeting, January 2000
Session 44. Late Stages of Stellar Evolution
Display, Thursday, January 13, 2000, 9:20am-6:30pm, Grand Hall

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[44.02] Isochrone Ages and Moving Groups of Nearby Stars

A. M. Mandell (Yale U.), M. S. Connelley (Santa Clara U.), D. E. Backman (F&M College)

HIPPARCOS parallaxes, proper motions, and apparent magnitudes for nearby field stars allow newly precise estimates of their ages, as well as comparison of space motions with other field stars and known moving groups. We present ages and uncertainties for ~50 A, F, G, and K main sequence stars within 20 pc of the Sun, and limits for ~0 others, based on interpolation of absolute magnitudes and colors in theoretical isochrones and evolutionary tracks from Bertelli et al. (1994). We also searched for space motions in common between the luminous nearby stars and M main sequence stars in the same 20 pc volume, and for nearby stars with motions parallel to known moving groups and clusters. Comparison is made between isochrone ages and possible moving group assignments. We thank NASA for support.

The author(s) of this abstract have provided an email address for comments about the abstract: d_backman@acad.fandm.edu

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