TY - JOUR
T1 - The open cluster chemical analysis and mapping survey
T2 - Local galactic metallicity gradient with apogee using SDSS DR10
AU - Frinchaboy, Peter M.
AU - Thompson, Benjamin
AU - Jackson, Kelly M.
AU - O'Connell, Julia
AU - Meyer, Brianne
AU - Zasowski, Gail
AU - Majewski, Steven R.
AU - Chojnowksi, S. Drew
AU - Johnson, Jennifer A.
AU - Allende Prieto, Carlos
AU - Beers, Timothy C.
AU - Bizyaev, Dmitry
AU - Brewington, Howard
AU - Cunha, Katia
AU - Ebelke, Garrett
AU - García Pérez, Ana Elia
AU - Hearty, Frederick R.
AU - Holtzman, Jon
AU - Kinemuchi, Karen
AU - Malanushenko, Elena
AU - Malanushenko, Viktor
AU - Marchante, Moses
AU - Mészáros, Szabolcs
AU - Muna, Demitri
AU - Nidever, David L.
AU - Oravetz, Daniel
AU - Pan, Kaike
AU - Schiavon, Ricardo P.
AU - Schneider, Donald P.
AU - Shetrone, Matthew
AU - Simmons, Audrey
AU - Snedden, Stephanie
AU - Smith, Verne V.
AU - Wilson, John C.
PY - 2013/11/1
Y1 - 2013/11/1
N2 - The Open Cluster Chemical Analysis and Mapping (OCCAM) survey aims to produce a comprehensive, uniform, infrared-based data set for hundreds of open clusters, and constrain key Galactic dynamical and chemical parameters from this sample. This first contribution from the OCCAM survey presents analysis of 141 members stars in 28 open clusters with high-resolution metallicities derived from a large uniform sample collected as part of the Sloan Digital Sky Survey III/Apache Point Observatory Galactic Evolution Experiment. This sample includes the first high-resolution metallicity measurements for 22 open clusters. With this largest ever uniformly observed sample of open cluster stars we investigate the Galactic disk gradients of both [M/H] and [α/M]. We find basically no gradient in [α/M] across 7.9 kpc ≤ R GC ≤ 14.5 kpc, but [M/H] does show a gradient for R GC < 10 kpc and a significant flattening beyond R GC = 10 kpc. In particular, whereas fitting a single linear trend yields an [M/H] gradient of -0.09 ± 0.03 dex kpc -1 - similar to previously measure gradients inside 13 kpc - by independently fitting inside and outside 10 kpc separately we find a significantly steeper gradient near the Sun (7.9 ≤ R GC ≤ 10) than previously found (-0.20 ± 0.08 dex kpc-1) and a nearly flat trend beyond 10 kpc (-0.02 ± 0.09 dex kpc-1).
AB - The Open Cluster Chemical Analysis and Mapping (OCCAM) survey aims to produce a comprehensive, uniform, infrared-based data set for hundreds of open clusters, and constrain key Galactic dynamical and chemical parameters from this sample. This first contribution from the OCCAM survey presents analysis of 141 members stars in 28 open clusters with high-resolution metallicities derived from a large uniform sample collected as part of the Sloan Digital Sky Survey III/Apache Point Observatory Galactic Evolution Experiment. This sample includes the first high-resolution metallicity measurements for 22 open clusters. With this largest ever uniformly observed sample of open cluster stars we investigate the Galactic disk gradients of both [M/H] and [α/M]. We find basically no gradient in [α/M] across 7.9 kpc ≤ R GC ≤ 14.5 kpc, but [M/H] does show a gradient for R GC < 10 kpc and a significant flattening beyond R GC = 10 kpc. In particular, whereas fitting a single linear trend yields an [M/H] gradient of -0.09 ± 0.03 dex kpc -1 - similar to previously measure gradients inside 13 kpc - by independently fitting inside and outside 10 kpc separately we find a significantly steeper gradient near the Sun (7.9 ≤ R GC ≤ 10) than previously found (-0.20 ± 0.08 dex kpc-1) and a nearly flat trend beyond 10 kpc (-0.02 ± 0.09 dex kpc-1).
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U2 - 10.1088/2041-8205/777/1/L1
DO - 10.1088/2041-8205/777/1/L1
M3 - Article
AN - SCOPUS:84886256542
SN - 2041-8205
VL - 777
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L1
ER -