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

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dc.creatorGray, R. O.
dc.creatorCorbally, C. J.
dc.creatorGarrison, R. F.
dc.creatorMcFadden, M. T.
dc.creatorBubar, E. J.
dc.creatorMcGahee, C. E.
dc.creatorO'Donoghue, A. A.
dc.creatorKnox, E. R.
dc.date2006-03-28
dc.date.accessioned2026-07-07T11:25:25Z
dc.date.available2026-07-07T11:25:25Z
dc.descriptionWe 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.
dc.description62 pages including a long table, 6 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0603770
dc.identifierhttp://arxiv.org/abs/astro-ph/0603770
dc.identifierAstron.J.132:161-170,2006
dc.identifierdoi:10.1086/504637
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195504
dc.subjectAstrophysics
dc.titleContributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
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