Bibcode
Zamora, O.; García-Hernández, D. A.; Allende Prieto, C.; Carrera, R.; Koesterke, L.; Edvardsson, B.; Castelli, F.; Plez, B.; Bizyaev, D.; Cunha, K.; García Pérez, A. E.; Gustafsson, B.; Holtzman, J. A.; Lawler, J. E.; Majewski, S. R.; Manchado, A.; Mészáros, Sz.; Shane, N.; Shetrone, M.; Smith, V. V.; Zasowski, G.
Bibliographical reference
The Astronomical Journal, Volume 149, Issue 6, article id. 181, 17 pp. (2015).
Advertised on:
6
2015
Citations
120
Refereed citations
118
Description
The Sloan Digital Sky Survey-III (SDSS-III) Apache Point Observatory
Galactic Evolution Experiment (APOGEE) has obtained high-resolution (R
∼ 22,500), high signal-to-noise ratio (\gt 100) spectra in the
H-band (∼1.5–1.7 μm) for about 146,000 stars in the Milky
Way galaxy. We have computed spectral libraries with effective
temperature ({{T}eff}) ranging from 3500 to 8000 K for the
automated chemical analysis of the survey data. The libraries, used to
derive stellar parameters and abundances from the APOGEE spectra in the
SDSS-III data release 12 (DR12), are based on ATLAS9 model atmospheres
and the ASSɛT spectral synthesis code. We present a second set
of libraries based on MARCS model atmospheres and the spectral synthesis
code Turbospectrum. The ATLAS9/ASSɛT ({{T}eff} =
3500–8000 K) and MARCS/Turbospectrum ({{T}eff} =
3500–5500 K) grids cover a wide range of metallicity (‑2.5
≤slant [M/H] ≤slant +0.5 dex), surface gravity (0 ≤ log g
≤slant 5 dex), microturbulence (0.5 ≤slant ξ ≤slant 8 km
s‑1), carbon (‑1 ≤slant [C/M] ≤slant +1
dex), nitrogen (‑1 ≤slant [N/M] ≤slant +1 dex), and
α-element (‑1 ≤slant [α/M] ≤slant +1 dex)
variations, having thus seven dimensions. We compare the
ATLAS9/ASSɛT and MARCS/Turbospectrum libraries and apply both of
them to the analysis of the observed H-band spectra of the Sun and the
K2 giant Arcturus, as well as to a selected sample of well-known giant
stars observed at very high resolution. The new APOGEE libraries are
publicly available and can be employed for chemical studies in the
H-band using other high-resolution spectrographs.
Related projects
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