J/A+A/663/A4 Mean PASTEL atmospheric parameters (Soubiran+, 2022)
Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys.
Soubiran C., Brouillet N., Casamiquela L.
<Astron. Astrophys. 663, A4 (2022)>
=2022A&A...663A...4S 2022A&A...663A...4S (SIMBAD/NED BibCode)
ADC_Keywords: Abundances, [Fe/H] ; Effective temperatures ; Stars, normal ;
Optical
Keywords: stellar abundances - surveys
Abstract:
The iron abundance [Fe/H] in the atmosphere of FGK-type stars is
crucial in stellar and galactic physics. The number of stars with a
measured value of [Fe/H] is increasing considerably thanks to
spectroscopic surveys. However, different methodologies, inputs, and
assumptions used in spectral analyses lead to different precisions in
[Fe/H] and possibly to systematic differences, which need to be
evaluated. It is essential to understand the characteristics of each
survey to fully exploit their potential, in particular if the surveys
are combined to probe a larger galactic volume and to improve
statistics.
The purpose of this study is to compare [Fe/H] determinations from the
largest spectroscopic surveys to other catalogues taken as reference.
Offsets and dispersions of the residuals are examined, as are their
trends with other parameters. The investigated surveys are the latest
public releases of APOGEE, GALAH, RAVE, LAMOST, SEGUE, and the
Gaia-ESO Survey.
We use reference samples that provide independent determinations of
[Fe/H], which are compared to those from the surveys for common stars.
The distribution of the residuals is assessed through simple
statistics that measure the offset between two catalogues and the
dispersion representative of the precision of both catalogues. When
relevant, linear fits are performed. A large sample of FGK-type stars
with [Fe/H] based on high-resolution, high-signal-to-noise
spectroscopy was built from the PASTEL catalogue to provide a
reference sample. We also use FGK members in open and globular
clusters to assess the internal consistency of [Fe/H] of each survey.
The agreement of median [Fe/H] values for clusters observed by
different surveys is discussed.
All the surveys overestimate the low metallicities, and some of them
also underestimate the high metallicities. They perform well in the
most populated intermediate metallicity range whatever the resolution.
In most cases, the typical precision that we deduce from the
comparisons is in good agreement with the uncertainties quoted in the
catalogues. Some exceptions to this general behaviour are discussed.
Description:
We have compared the metallicity [Fe/H] of FGK stars from APOGEE DR16,
GALAH DR3, the Gaia ESO survey DR3, RAVE DR6, LAMOST DR5 and SEGUE to
those from reference samples that provide independent determinations
of [Fe/H]. A large sample of FGK-type stars with [Fe/H] based on
high-resolution, high-signal-to-noise spectroscopy was built from the
PASTEL catalogue to provide a reference sample. We also use FGK
members in open and globular clusters to assess the internal
consistency of [FeH] of each survey. Offsets and dispersions of the
residuals are examined, as are their trends with other parameters.
The weighted mean atmospheric parameters (Teff, logg, [Fe/H]) from
PASTEL are provided for 14181 FGK stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
meanpast.dat 152 14181 Mean (Teff, logg, [Fe/H]) from PASTEL
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See also:
B/pastel : The PASTEL catalogue (Soubiran+, 2016-)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
III/283 : RAVE 6th data release (Steinmetz+, 2020)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
Byte-by-byte Description of file: meanpast.dat
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Bytes Format Units Label Explanations
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1- 33 A33 --- Name Designation
35- 49 F15.11 deg RAdeg ? Right Ascension (J2000)
51- 65 F15.11 deg DEdeg ? Declination (J2000)
67- 72 F6.3 mag Vmag ? Johnson V magnitude from Simbad
74- 78 F5.3 mag e_Vmag ? Standard error on Vmag
80- 85 F6.3 mag Ksmag ? 2MASS Ks apparent magnitude
87- 92 F6.3 mag e_Ksmag ? 2MASS Ks total magnitude uncertainty
94-112 I19 --- GaiaDR2 ? Gaia DR2 Source identifier
114-117 I4 K Teff Weighted mean effective temperature
119-121 I3 K e_Teff Uncertainty of effective temperature
123-124 I2 --- o_Teff Number of Teff considered in the mean
126-130 F5.2 [cm/s2] logg Weighted mean logarithm of surface gravity
132-135 F4.2 [cm/s2] e_logg Uncertainty of logg
137-138 I2 --- o_logg Number of logg considered in the mean
140-144 F5.2 [Sun] [Fe/H] Weighted mean iron abundance
146-149 F4.2 [Sun] e_[Fe/H] Uncertainty of iron abundance
151-152 I2 --- o_[Fe/H] Number of [Fe/H] considered in the mean
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Acknowledgements:
Caroline Soubiran, caroline.soubiran(at)u-bordeaux.fr
(End) Caroline Soubiran [LAB, France], Patricia Vannier [CDS] 14-Jan-2022