AAS 205th Meeting, 9-13 January 2005
Session 13 Stellar Evolution
Poster, Monday, January 10, 2005, 9:20am-6:30pm, Exhibit Hall

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[13.06] A Study of Volume-Limited Hipparcos Sample within 100 pc: Preliminary Results

P. L. Lim, J. A. Holtzman (New Mexico State University), V. V. Smith (National Optical Astronomy Observatory)

Accurate parallax measurements of solar neighborhood stars from the Hipparcos catalog have enabled detailed studies of stellar properties. Subgiants are of particular interest because their ages could be determined with fair accuracy and they are found to be a decent trace of chemical evolution in our Galaxy. Hence we have initiated a project to obtain high-resolution Echelle spectra of evolved Hipparcos stars in a volume-limited sample within 100 parsec. We will perform detailed abundance analysis to constraint stellar properties and investigate the chemical evolution and the star formation history of the solar neighborhood. Here, we present some preliminary results of this project. In particular, we have obtained stellar properties for several subgiants in our sample, and we compare the surface gravities of these stars derived from both trigonometric and spectroscopic methods.

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© 2004. The American Astronomical Society.