J/A+A/691/A182 High-Quality gamma Dor stars GSP-Spec param. (de Laverny+, 2024)
Gaia/GSP-Spec spectroscopic properties of γ Doradus pulsators.
de Laverny P., Recio-Blanco A., Aerts C., Palicio P.A.
<Astron. Astrophys. 691, A182 (2024)>
=2024A&A...691A.182D 2024A&A...691A.182D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, early-type ; Stars, variable ; Effective temperatures ;
Abundances ; Optical
Keywords: stars: early-type - stars: fundamental parameters - stars: low-mass -
stars: variables: general
Abstract:
The third Data Release of the ESA Gaia mission has provided a large
sample of new gravity-mode pulsators, among which
more than 11600 are γ Dor stars.
The goal of the present work is to present the spectroscopic
parameters of these γ Dor pulsators estimated by the GSP-Spec
module that analysed millions of Gaia spectra. Such a parametrisation
could help confirm their γ Dor nature and provide their chemo-
physical properties.
The Galactic positions, kinematics, and orbital properties of these
new Gaia pulsators were examined in order to define a sub-sample
belonging to the Milky Way thin disc, in which these young stars
should preferentially be found. The stellar luminosities, radii, and
astrometric surface gravities were estimated without adopting any
priors from uncertain stellar evolution models. These parameters,
combined with the GSP-Spec effective temperatures, spectroscopic
gravities, and metallicities were then validated by comparison with
recent literature studies.
Most stars are found to belong to the Galactic thin disc, as expected.
It is also found that the derived luminosities, radii, and
astrometric surface gravities are high quality and have values typical
of genuine γ Dor pulsators. Moreover, we show that Teff and
[M/H] of pulsators with high enough S/N spectra or slow to moderate
rotation rates are robust. This allowed to define a sub-sample of
genuine slow-rotating Gaia γ Dor pulsators. Their Teff were
found to be between ∼6500 and ∼7800K, log(g) is around 4.2, and the
luminosities and stellar radii peak at ∼5L☉ and ∼1.7R☉.
The median metallicity is close to the Solar value, although γ
Dor with higher and lower metallicities by about ±0.5dex were also
identified. The [α/Fe] content is fully consistent with the
chemical properties of the Galactic disc.
Gaia/DR3 spectroscopic properties of γ Dor stars therefore
confirm the nature of these pulsators and allow to chemo-physically
parametrise a new large sample of such stars. Moreover, future Gaia
data releases should drastically increase the number of γ Dor
stars with parameters spectroscopically derived with good precision.
Description:
GSP-Spec parameters of the High-Quality γ Dor stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 223 151 Parameters of HQ Dor stars
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Star Name (Gaia DR3 Id)
21- 26 F6.1 K Teff Effective temperature
28- 32 F5.1 K e_Teff Effective temperature uncertainty
34- 51 F18.16 [cm/s2] logg Stellar surface gravity in log scale
53- 71 F19.17 [cm/s2] e_logg Stellar surface gravity uncertainty
73- 85 F13.10 --- Met ? Stellar mean metallicity
87- 99 F13.10 --- e_Met ? Stellar mean metallicity uncertainty
101-122 F22.19 --- [a/Fe] ? Abundances ratio [alpha/Fe]
124-135 F12.9 --- e_[a/Fe] ? Abundances ratio [alpha/Fe] uncertainty
137-156 F20.16 Lsun L ? Stellar luminosity
158-178 F21.18 Lsun e_L ? Stellar luminosity uncertainty
180-198 F19.16 Rsun R ? Stellar radius
200-220 F21.18 Rsun e_R ? Stellar radius uncertainty
223 I1 --- TD [1]? Thin disc membership (Yes = 1)
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Acknowledgements:
Patrick de Laverny, patrick.de_laverny(at)oca.eu
(End) Patricia Vannier [CDS] 22-Oct-2024