J/A+A/649/A147 Spectroscopic parameters for 313 M dwarfs (Sarmento+, 2021)
Determination of spectroscopic parameters for 313 M dwarf stars from their
APOGEE Data Release 16 H-band spectra.
Sarmento P., Rojas-Ayala B., Delgado Mena E., Blanco-Cuaresma S.
<Astron. Astrophys. 649, A147 (2021)>
=2021A&A...649A.147S 2021A&A...649A.147S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Effective temperatures ; Abundances ; Spectroscopy
Keywords: techniques: spectroscopy - stars: fundamental parameters -
stars: late-type - stars: low-mass
Abstract:
The scientific community's interest on the stellar parameters of M
dwarfs has been increasing over the last few years, with potential
applications ranging from galactic characterization to exoplanet
detection.
The main motivation for this work is to develop an alternative and
objective method to derive stellar parameters for M dwarfs using the
H-band spectra provided by the Apache Point Observatory Galactic
Evolution Experiment (APOGEE).
Synthetic spectra generated with iSpec, Turbospectrum, MARCS models
atmospheres and a custom made line list including over 1000000 water
lines, are compared to APOGEE observations, and parameters are
determined through χ2 minimization. Spectroscopic parameters
(Teff, [M/H], logg, vmic) are presented for a sample of 313 M
dwarfs, obtained from their APOGEE H-band spectra. The generated
synthetic spectra reproduce observed spectra to a high accuracy level.
The impact of the spectra normalization on the results are analyzed as
well.
Our output parameters are compared with the ones obtained with APOGEE
Stellar Parameter and Chemical Abundances Pipeline (ASPCAP) for the
same stellar spectrum, and we find that the values agree within the
expected uncertainties. Comparisons with other previous near-infrared
and optical literature are also available, with median differences
within our estimated uncertainties found in most cases. Possible
reasons for these differences are explored. The full H-band line list,
the line selection for the synthesis, and the synthesized spectra are
available for download, as are the calculated stellar parameters.
Description:
Building on the method previously presented in Sarmento et al.
(2020, arXiv:2001.01995), we derived stellar atmospheric parameters
for 313 M dwarfs with 3000K<Te100K<4200K, 4.5dex<logg±0.2dex<5.3dex
and -1.05dex<[M/H]±0.1dex<0.56dex.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 135 313 All derived parameters for stellar sample
from APOGEE DR16
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See also:
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name APOGEEID1 name, 2MHHMMSSss+DDMMSSs
20- 23 I4 K TeffI Input Normalization effective temperature (T_I)
25- 27 F3.1 [cm/s2] loggI Input Normalization log(g) (log g_I)
29- 32 F4.1 --- [M/H]I Input Normalization Metallicity (MH_I)
34- 40 F7.2 K TeffO Output effective temperature (T_O)
42- 48 F7.5 [cm/s2] loggO Output surface gravity (log g_O)
50- 54 F5.2 --- [M/H]O Output metallicity (MH_O)
56- 62 F7.5 km/s vmicO Output microturbulence (vmic_O)
64- 68 F5.2 km/s vmacO Output macroturbulence (vmac_O)
70- 77 F8.5 km/s vsiniO Output rotational velocity (vsini_O)
79- 81 F3.1 --- limbO Output limb darkening (limb_O)
83- 89 F7.1 --- RO Output resolution (R_O)
91- 99 F9.7 --- rwchisq Output reduced chiSquare (rwchisq)
101-110 F10.6 deg RAdeg Right Ascension (J2000) (RA)
112-121 F10.6 deg DEdeg Declination (J2000) (DEC)
123-128 F6.1 K Teffsp ASPCAP DR16 effective temperature (TEFF_SPEC)
130-135 F6.4 [cm/s2] loggsp ASPCAP DR16 surface gravity (LOGG_SPEC)
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Acknowledgements:
Pedor Sarmento, pedro.sarment(at)astro.up.pt
(End) Patricia Vannier [CDS] 11-Mar-2021