J/A+A/654/A130 GSP-spec line list (Contursi+, 2021)
GSP-spec line list for the parametrisation of Gaia-RVS stellar spectra.
Contursi G., de Laverny P., Recio-Blanco A., Palicio P.A.
<Astron. Astrophys. 654, A130 (2021)>
=2021A&A...654A.130C 2021A&A...654A.130C (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Optical
Keywords: stars: abundances - atomic data - line: identification - surveys -
stars: fundamental parameters
Abstract:
The Gaia mission is a magnitude-limited whole-sky survey that collects
an impressive quantity of astrometric, spectro-photometric and
spectroscopic data.
Among all the on-board instruments, the Radial Velocity Spectrometer
(RVS) produces millions of spectra up to a magnitude of GRVS 16. For
the brightest RVS targets, stellar atmospheric parameters and
individual chemical abundances are automatically estimated by the
Generalized Stellar Parametriser - spectroscopy group (GSP-Spec).
These data will be published with the third Gaia Data Release.
Some major ingredients of the determination of these stellar
parameters include the atomic and molecular line lists that are
adopted to compute reference synthetic spectra, on which the
parametrisation methods rely. We aim to build such a specific line
list optimised for the analysis of RVS late-type star spectra.
Starting from the Gaia-ESO line lists, we first compared the observed
and synthetic spectra of six well-known reference late-type stars in
the wavelength range covered by the RVS instrument. We then improved
the quality of the atomic data for the transitions presenting the
largest mismatches.
The new line list is found to produce very high-quality synthetic
spectra for the tested reference stars and has thus been adopted
within GSP-Spec.
Description:
The new line list presented is found to produce very high-quality
synthetic spectra for the tested reference stars and has thus been
adopted within GSP-Spec.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
calib.dat 44 163 List of calibrated lines
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Byte-by-byte Description of file: calib.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- El Element and its ionisation state
7- 14 F8.4 nm lambdaAir Air wavelength
15 A1 --- n_lambdaAir [*] Note on lambdaAir (1)
17- 24 F8.4 nm lambdaVac Vacuum wavelength (2)
26- 30 F5.3 eV EGES Lower excitation potential (from GES line list)
32- 37 F6.3 [-] loggGES ? Oscillator strength from the GES line list
39- 44 F6.3 [-] loggRVS Oscillator strength calibrated
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Note (1): The (*) symbol indicated the line for which we touch the wavelength.
Note (2): Conversion made thanks to Birch & Downs 1994 : 1994Metro..31..315B 1994Metro..31..315B.
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Acknowledgements:
Gabriele Contursi, gabriele.contursi(at)oca.eu
(End) Patricia Vannier [CDS] 16-Oct-2021