J/A+A/672/A166 [Mg/Fe] and [Ca/Fe] abundances of XSL (Santos-Peral+, 2023)
Chemical characterisation of the X-shooter Spectral Library (XSL):
[Mg/Fe] and [Ca/Fe] abundances.
Santos-Peral P., Sanchez-Blazquez P., Vazdekis A., Palicio P.A.
<Astron. Astrophys. 672, A166 (2023)>
=2023A&A...672A.166S 2023A&A...672A.166S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Abundances ; Spectra, optical ;
Spectra, ultraviolet
Keywords: stars: abundances - methods: data analysis - techniques: spectroscopic
Abstract:
The X-shooter Spectral Library (XSL) is a large empirical stellar
library used as a benchmark for the development of stellar population
models. The inclusion of alpha-elements abundances is crucial to
disentangling the chemical evolution of any stellar system. This paper
provides a catalogue of high-precision and accurate magnesium and
calcium abundances from a wide variety of stars well distributed in
the Hertzsprung-Russell (HR) diagram. We originally performed an
analysis of the derived Mg and Ca abundances for medium-resolution
spectra from the XSL Data Release 2. For this purpose, we used the
GAUGUIN automated abundance estimation code to fit the
ultraviolet-blue (UVB) and visible (VIS) spectra. We tested the
consistency of the atmospheric parameters and chemical abundances with
the Gaia DR3 and the AMBRE Project datasets.We have obtained precise
[Mg/Fe] and [Ca/Fe] abundances for 192 and 217 stars respectively,
from which 174 stars have measurements in both elements. The stars
cover a broad range of effective temperature 4000<Teff<6500K,
surface gravity 0.3<log(g)<4.8cm/s2, and metallicity
-2.5<[Fe/H]<+0.4dex. We find an excellent agreement with the abundance
estimates from the AMBRE:HARPS and the Gaia/RVS analysis. Moreover,
the resulting abundances reproduce a plateau in the metal-poor regime
followed by a decreasing trend even at supersolar metallicities, as
predicted by Galactic chemical evolution models. This catalogue is
suitable for improving the modelling of evolutionary stellar
population models with empirical alpha-enhancements, which could
significantly contribute to the analysis of external galaxies
abundances in the near future.
Description:
In this table, we provide precise [Mg/Fe] and [Ca/Fe] abundances for a
total of 235 stars, together with their stellar atmospheric parameters
and the features of the spectra connected to each star.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 191 235 X-shooter catalogue of magnesium and calcium
abundances
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR2 Gaia DR2 identifier (source_id)
21- 39 I19 --- GaiaDR3 Gaia DR3 identifier (source_id)
41- 44 I4 K Teff Effective temperature
46- 49 F4.2 [cm/s2] logg Surface gravity
51- 59 F9.6 [-] [Fe/H] Stellar metallicity
61- 68 F8.6 [-] [alpha/Fe] Adopted [alpha/Fe] parameter
70- 78 A9 --- r_[alpha/Fe] Origin from the adopted [alpha/Fe]
(empirical approach or Gaia DR3)
80 I1 --- Nspec-UVB ? Number of repeat spectra analysed from
the UVB X-shooter arm
82- 87 F6.2 --- S/N-UVB ?=- Average signal-to-noise of the
analysed UVB spectra
89- 97 F9.6 [-] [Mg/Fe] ?=- [Mg/Fe] abundance value
99-106 F8.6 [-] e_[Mg/Fe] ?=- [Mg/Fe] associated internal uncertainty
108-115 F8.6 [-] e1_[Mg/Fe] ?=- [Mg/Fe] associated uncertainty to
sensitivity to the stellar parameters
117-124 F8.6 [-] s_[Mg/Fe] ?=- [Mg/Fe] dispersion among different
spectra of the same star
126 I1 --- Nspec-VIS ? Number of repeat spectra analysed from the
VIS X-shooter arm
128-133 F6.2 --- S/N-VIS ?=- Average signal-to-noise of the
analysed VIS spectra
135-140 F6.3 [-] [Ca/Fe] ?=- [Mg/Fe] abundance value
142-149 F8.6 [-] e_[Ca/Fe] ?=- [Ca/Fe] associated internal uncertainty
151-155 F5.3 [-] e1_[Ca/Fe] ?=- [Ca/Fe] associated uncertainty to
sensitivity to the stellar parameters
157-164 F8.6 [-] s_[Ca/Fe] ?=- [Ca/Fe] dispersion among different
spectra of the same star
166-191 A26 --- XSLspectra XSL spectral designations connected to
the star
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Acknowledgements:
Pablo Santos-Peral, pasant02(at)ucm.es
(End) P. Santos-Peral [Univ. Complutense Madrid], P. Vannier [CDS] 09-Feb-2023