TY - JOUR
T1 - The segue stellar parameter pipeline. II. Validation with galactic globular and open clusters
AU - Lee, Young Sun
AU - Beers, Timothy C.
AU - Sivarani, Thirupathi
AU - Johnson, Jennifer A.
AU - An, Deokkeun
AU - Wilhelm, Ronald
AU - Allende Prieto, Carlos
AU - Koesterke, Lars
AU - Fiorentin, Paola Re
AU - Bailer-Jones, Coryn A.L.
AU - Norris, John E.
AU - Yanny, Brian
AU - Rockosi, Constance
AU - Newberg, Heidi J.
AU - Cudworth, Kyle M.
AU - Pan, Kaike
PY - 2008/11/1
Y1 - 2008/11/1
N2 - 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).
AB - 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).
KW - Methods: data analysis
KW - Stars: abundances
KW - Stars: fundamental parameters
KW - Surveys
KW - Techniques: spectroscopic
UR - http://www.scopus.com/inward/record.url?scp=56449089779&partnerID=8YFLogxK
U2 - 10.1088/0004-6256/136/5/2050
DO - 10.1088/0004-6256/136/5/2050
M3 - Article
AN - SCOPUS:56449089779
SN - 0004-6256
VL - 136
SP - 2050
EP - 2069
JO - Astronomical Journal
JF - Astronomical Journal
IS - 5
ER -