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⇱ Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc—The Southern Sample - IOPscience

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Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc—The Southern Sample

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Published 2006 June 2 • © 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astronomical Journal, Volume 132, Number 1Citation R. O. Gray et al 2006 AJ 132 161DOI 10.1086/504637

R. O. Gray

AFFILIATIONS

Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608

C. J. Corbally

AFFILIATIONS

Vatican Observatory Research Group, Steward Observatory, Tucson, AZ 85721-0065

R. F. Garrison

AFFILIATIONS

David Dunlap Observatory, P.O. Box 360, Station A, Richmond Hill, ON L4C 4Y6, Canada

M. T. McFadden

AFFILIATIONS

Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608

E. J. Bubar

AFFILIATIONS

Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608

Department of Physics and Astronomy, Clemson University, Clemson. SC 29634

C. E. McGahee

AFFILIATIONS

Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608

A. A. O’Donoghue

AFFILIATIONS

Department of Physics, St. Lawrence University, Canton, NY 13617

E. R. Knox

AFFILIATIONS

Department of Physics, St. Lawrence University, Canton, NY 13617

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Dates

  1. Received 2006 February 1
  2. Accepted 2006 March 27
  3. Published 2006 June 2
1538-3881/132/1/161

Abstract

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 40 pc of the Sun. Here we report on results for 1676 stars in the southern hemisphere observed at Cerro Tololo Inter-American 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 analogs. We also demonstrate that the bimodal nature of the distribution of the chromospheric activity parameter log R👁 Equation or symbol description not available
depends strongly on the metallicity, and we explore the nature of the "low-metallicity" chromospherically active K-type dwarfs.

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10.1086/504637