Calibrations of Atmospheric Parameters Obtained from the First Year of SDSS-III APOGEE Observations

Autor(en)

Sz. Mészáros, J. Holtzman, A. E. García Pérez, C. Allende Prieto, R. P. Schiavon, S. Basu, D. Bizyaev, W. J. Chaplin, S. D. Chojnowski, K. Cunha, Y. Elsworth, C. Epstein, P. M. Frinchaboy, R. A. García, F. R. Hearty, S. Hekker, T. Kallinger, L. Koesterke, S. L. Martell, D. Nidever, M. H. Pinsonneault, J. O'Connell, M. Shetrone, V. V. Smith, G. Zasowski

Abstrakt

The Sloan Digital Sky Survey III (SDSS-III) Apache Point Observatory

Galactic Evolution Experiment (APOGEE) is a three-year survey that is

collecting 105 high-resolution spectra in the near-IR across

multiple Galactic populations. To derive stellar parameters and chemical

compositions from this massive data set, the APOGEE Stellar Parameters

and Chemical Abundances Pipeline (ASPCAP) has been developed. Here, we

describe empirical calibrations of stellar parameters presented in the

first SDSS-III APOGEE data release (DR10). These calibrations were

enabled by observations of 559 stars in 20 globular and open clusters.

The cluster observations were supplemented by observations of stars in

NASA's Kepler field that have well determined surface gravities from

asteroseismic analysis. We discuss the accuracy and precision of the

derived stellar parameters, considering especially effective

temperature, surface gravity, and metallicity; we also briefly discuss

the derived results for the abundances of the α-elements, carbon,

and nitrogen. Overall, we find that ASPCAP achieves reasonably accurate

results for temperature and metallicity, but suffers from systematic

errors in surface gravity. We derive calibration relations that bring

the raw ASPCAP results into better agreement with independently

determined stellar parameters. The internal scatter of ASPCAP parameters

within clusters suggests that metallicities are measured with a

precision better than 0.1 dex, effective temperatures better than 150 K,

and surface gravities better than 0.2 dex. The understanding provided by

the clusters and Kepler giants on the current accuracy and precision

will be invaluable for future improvements of the pipeline.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

University of Arizona, Ohio State University, University of Birmingham, Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, New Mexico State University, University of Virginia, Liverpool John Moores University (LJMU), Yale University, Apache Point Observatory, Observatório Nacional/MCT, Texas Christian University, Université Paris VII - Paris-Diderot, University of Amsterdam (UvA), University of Texas, Austin, Australian Astronomical Observatory, University of Michigan, National Optical Astronomy Observatory, Tucson

Journal

The Astrophysical Journal: an international review of astronomy and astronomical physics

Band

146

Anzahl der Seiten

19

ISSN

0004-637X

DOI

https://doi.org/10.1088/0004-6256/146/5/133

Publikationsdatum

11-2013

Peer-reviewed

Ja

ÖFOS 2012

103004 Astrophysik, 103003 Astronomie

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/82c11d89-d3c1-41ed-bad5-2bcf332cd2dd