Isochrone Ages and Moving Groups of Nearby Stars
Abstract
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 150 A, F, G, and K main sequence stars within 20 pc of the Sun, and limits for 30 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.
- Publication:
-
American Astronomical Society Meeting Abstracts
- Pub Date:
- December 1999
- Bibcode:
- 1999AAS...195.4402M