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

2006/03/28 by R. O. Gray, C. J. Corbally, R. F. Garrison +8 · 549 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Giant star #Homogeneous #Metallicity #Observatory #Physics #Spectral line #Stars #Stellar classification #Stellar, planetary, and galactic studies #Surface gravity #astro-ph

paper · pdf · doi:10.1086/504637

published in The Astronomical Journal 132(1), 161-170 (Institute of Physics) · 62 pages including a long table, 6 figures

arxiv created 2006/03/28 · openalex publication_date 2006/06/02 · arxiv updated 2009/12/01 · openalex created_date 2022/05/12 · openalex updated_date 2026/08/05

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 depends strongly on the metallicity, and we explore the nature of the "low-metallicity" chromospherically active K-type dwarfs.

Citations

• Statistical Constraints for Astrometric Binaries with Nonlinear Motion

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