THE OPEN CLUSTER CHEMICAL ANALYSIS AND MAPPING SURVEY: LOCAL GALACTIC METALLICITY GRADIENT WITH APOGEE USING SDSS DR10
| Autor: | Karen Kinemuchi, David L. Nidever, Jennifer A. Johnson, Jon Holtzman, Julia E. O'Connell, Ana G. Pérez, Frederick R. Hearty, Howard Brewington, Carlos Allende Prieto, Szabolcs Mészáros, Dmitry Bizyaev, Viktor Malanushenko, Donald P. Schneider, Peter M. Frinchaboy, Garrett Ebelke, Benjamin A. Thompson, Verne V. Smith, Elena Malanushenko, Daniel Oravetz, Ricardo P. Schiavon, Timothy C. Beers, Steven R. Majewski, Brianne Meyer, John C. Wilson, Stephanie A. Snedden, Matthew Shetrone, Kaike Pan, S. Drew Chojnowksi, Kelly M. Jackson, Moses Marchante, Audrey Simmons, Gail Zasowski, Katia Cunha, Demitri Muna |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Infrared Astrophysics::High Energy Astrophysical Phenomena Metallicity FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Flattening Stars Space and Planetary Science Observatory Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Disc 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Linear trend Open cluster |
| Zdroj: | The Astrophysical Journal. 777:L1 |
| ISSN: | 2041-8213 2041-8205 |
| DOI: | 10.1088/2041-8205/777/1/l1 |
| Popis: | The Open Cluster Chemical Analysis and Mapping (OCCAM) Survey aims to produce a comprehensive, uniform, infrared-based dataset 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 SDSS-III/Apache Point Observatory Galactic Evolution Experiment (APOGEE). 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 [alpha/M]. We find basically no gradient across this range in [alpha/M], 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 --- 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 6 pages, 4 figures, ApJ letters, in press |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|