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Derivation of parameters for 3748 FGK stars using H-band spectra from APOGEE Data Release 14

P. I. T. K. Sarmento, E. Delgado Mena, B. Rojas-Ayala, S. Blanco-Cuaresma

Abstract
Context. The Apache Point Observatory Galactic Evolution Experiment (APOGEE) has observed the H-band spectra of over 200 000 stars with R ∼ 22 000.
Aims. The main motivation for this work is to test an alternative method to the standard APOGEE pipeline (APOGEE Stellar Parameter and Chemical Abundances Pipeline, ASPCAP) to derive parameters in the near-infrared for FGK dwarfs. Methods. iSpec and Turbospectrum are used to generate synthetic spectra matching APOGEE observations and to determine the parameters through χ2 minimization.
Results. We present spectroscopic parameters (Teff, [M/H], log g, vmic) for a sample of 3748 main-sequence and subgiant FGK stars, obtained from their APOGEE H-band spectra.
Conclusions. We compare our output parameters with the ones obtained with ASPCAP for the same stellar spectrum, and find that the values agree within the expected uncertainties. A comparison with the optical samples California Planet Survey, High Accuracy Radial Velocity Planet Searcher – Guaranteed Time Observations, and PASTEL is also available, and median differences below 10 K for Teff and 0.2 dex for [M/H] are found. Reasons for these differences are explored. The full H-band line list, the line selection for the synthesis, and the synthesized spectra are available at the CDS, as are the calculated parameters and their estimated uncertainties.

Keywords
stars: fundamental parameters; stars: solar-type; techniques: spectroscopic; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Astrophysics of Galaxies

Notes
The line list, line mask, and parameter table are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/636/A85

Astronomy and Astrophysics
Volume 636, Article Number A85, Number of pages 19
2020 April

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia