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Title:
The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters
Authors:
Lee, Young Sun; Beers, Timothy C.; Sivarani, Thirupathi; Johnson, Jennifer A.; An, Deokkeun; Wilhelm, Ronald; Allende Prieto, Carlos; Koesterke, Lars; Re Fiorentin, Paola; Bailer-Jones, Coryn A. L.; Norris, John E.; Yanny, Brian; Rockosi, Constance; Newberg, Heidi J.; Cudworth, Kyle M.; Pan, Kaike
Affiliation:
AA(Department of Physics & Astronomy, Center for the Study of Cosmic Evolution, and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA ), AB(Department of Physics & Astronomy, Center for the Study of Cosmic Evolution, and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA ), AC(Department of Physics & Astronomy, Center for the Study of Cosmic Evolution, and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA ), AD(Department of Astronomy, Ohio State University, Columbus, OH 43210, USA ), AE(Department of Astronomy, Ohio State University, Columbus, OH 43210, USA ), AF(Department of Physics, Texas Tech University, Lubbock, TX 79409, USA ), AG(Department of Astronomy, University of Texas, Austin, TX 78712, USA ), AH(Department of Astronomy, University of Texas, Austin, TX 78712, USA ; Current address: Texas Advanced Computer Center, The University of Texas, Austin, TX 78758, USA. ; ), AI(Max-Planck-Institute für Astronomy, Königstuhl 17, D-69117, Heidelberg, Germany ; Current address: Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia.; ), AJ(Max-Planck-Institute für Astronomy, Königstuhl 17, D-69117, Heidelberg, Germany ), AK(Research School of Astronomy and Astrophysics, Australian National University, Weston, ACT 2611, Australia ), AL(Fermi National Accelerator Laboratory, Batavia, IL 60510, USA ), AM(Department of Astronomy, University of California, Santa Cruz, CA 95064, USA ), AN(Department of Physics & Astronomy, Rensselaer Polytechnical Institute, Troy, NY 12180, USA ), AO(Yerkes Observatory, The University of Chicago, Williams Bay, WI 53191, USA ), AP(Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USA )
Publication:
The Astronomical Journal, Volume 136, Issue 5, pp. 2050-2069 (2008). (AJ Homepage)
Publication Date:
11/2008
Origin:
IOP
AJ Keywords:
methods: data analysis, stars: abundances, stars: fundamental parameters, surveys, techniques: spectroscopic
DOI:
10.1088/0004-6256/136/5/2050
Bibliographic Code:
2008AJ....136.2050L

Abstract

We validate the accuracy and precision of the current SEGUE (Sloan Extension for Galactic Understanding and Exploration) Stellar Parameter Pipeline (SSPP), which determines stellar atmospheric parameters (effective temperature, surface gravity, and metallicity) and radial velocities (RVs), by comparing these estimates for selected members of three globular clusters (M 13, M 15, and M 2) and two open clusters (NGC 2420 and M 67) to the literature values. Spectroscopic and photometric data obtained during the course of the original Sloan Digital Sky Survey (SDSS-I) and its first extension (SDSS-II/SEGUE) are used to determine atmospheric parameter and RV estimates for stars in these clusters. Based on the scatter in the metallicities derived for the members of each cluster, we quantify the typical uncertainty of the SSPP values, σ ([Fe/H]) = 0.13 dex for stars in the range of -0.3 <= g - r <= 1.3 and 2.0 <= log g <= 5.0, at least over the metallicity interval spanned by the clusters studied (-2.3 <= [Fe/H] <= 0). The surface gravities and effective temperatures derived by the SSPP are also compared with those estimated from the comparison of color-magnitude diagrams with stellar evolution models; we find satisfactory agreement (σ(T eff)< 200 K and σ(log g) <= 0.4 dex).
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