期刊
ASTRONOMICAL JOURNAL
卷 137, 期 5, 页码 4377-4399出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/137/5/4377
关键词
Galaxy: halo; Galaxy: stellar content; Galaxy: structure; stars: abundances; stars: fundamental parameters; stars: general
资金
- NASA [NAG 5-13057, NAG 5-13147]
- Physics Frontiers Center/Joint Institute for Nuclear Astrophysics (JINA) [PHY 02-16783]
- U. S. National Science Foundation
- Marie Curie Research Training Network [ELSA MRTN-CT-2006-033481]
- Science and Technology Facilities Council [ST/F002599/1, PP/E001068/1, PP/E00105X/1] Funding Source: researchfish
- UK Space Agency [PP/D006570/1] Funding Source: researchfish
- STFC [PP/E001068/1, PP/E00105X/1, ST/F002599/1] Funding Source: UKRI
The Sloan Extension for Galactic Understanding and Exploration (SEGUE) Survey obtained approximate to 240,000 moderate-resolution (R similar to 1800) spectra from 3900 angstrom to 9000 angstrom of fainter Milky Way stars (14.0 < g < 20.3) of a wide variety of spectral types, both main-sequence and evolved objects, with the goal of studying the kinematics and populations of our Galaxy and its halo. The spectra are clustered in 212 regions spaced over three quarters of the sky. Radial velocity accuracies for stars are sigma(RV) similar to 4 km s(-1) at g < 18, degrading to s(RV) similar to 15 km s(-1) at g similar to 20. For stars with signal-to-noise ratio > 10 per resolution element, stellar atmospheric parameters are estimated, including metallicity, surface gravity, and effective temperature. SEGUE obtained 3500 deg(2) of additional ugriz imaging (primarily at low Galactic latitudes) providing precise multicolor photometry (sigma(g, r, i) similar to 2%), (sigma(u, z) similar to 3%) and astrometry (approximate to 0 ''.1) for spectroscopic target selection. The stellar spectra, imaging data, and derived parameter catalogs for this survey are publicly available as part of Sloan Digital Sky Survey Data Release 7.
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