Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-28
Astron.J.132:161-170,2006
Astronomy and Astrophysics
Astrophysics
62 pages including a long table, 6 figures
Scientific paper
10.1086/504637
We are obtaining spectra, spectral types and basic physical parameters for the nearly 3600 dwarf and giant stars earlier than M0 in the Hipparcos catalog within 40pc of the Sun. Here we report on results for 1676 stars in the southern hemisphere observed at Cerro Tololo Interamerican Observatory and Steward Observatory. These results include new, precise, homogeneous spectral types, basic physical parameters (including the effective temperature, surface gravity, and metallicity, [M/H]) and measures of the chromospheric activity of our program stars. We include notes on astrophysically interesting stars in this sample, the metallicity distribution of the solar neighborhood and a table of solar analogues. We also demonstrate that the bimodal nature of the distribution of the chromospheric activity parameter log R'HK depends strongly on the metallicity, and we explore the nature of the ``low-metallicity'' chromospherically active K-type dwarfs.
Bubar Eric J.
Corbally Christopher J.
Garrison Robert F.
Gray Richard O.
Knox E. R.
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