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Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3

Kordopatis, G. ; Schultheis, M. ; McMillan, P. J. LU orcid ; Palicio, P. A. ; De Laverny, P. ; Recio-Blanco, A. ; Creevey, O. ; Álvarez, M. A. ; Andrae, R. and Poggio, E. , et al. (2023) In Astronomy and Astrophysics 669.
Abstract

Context.Gaia's third data release provides radial velocities for 33 million stars and spectroscopically derived atmospheric parameters for more than 5 million targets. When combined with the astrometric data, these allow us to derive orbital and stellar parameters that are key to understanding the stellar populations of the Milky Way and to perform Galactic archaeology. Aims. We used the calibrated atmospheric parameters, 2MASS and Gaia-EDR3 photometry, and parallax-based distances to compute the ages, initial stellar masses, and reddenings for the stars with spectroscopic parameters. We also derived the orbits for all of the stars with measured radial velocities and astrometry, adopting two sets of line-of-sight distances from the... (More)

Context.Gaia's third data release provides radial velocities for 33 million stars and spectroscopically derived atmospheric parameters for more than 5 million targets. When combined with the astrometric data, these allow us to derive orbital and stellar parameters that are key to understanding the stellar populations of the Milky Way and to perform Galactic archaeology. Aims. We used the calibrated atmospheric parameters, 2MASS and Gaia-EDR3 photometry, and parallax-based distances to compute the ages, initial stellar masses, and reddenings for the stars with spectroscopic parameters. We also derived the orbits for all of the stars with measured radial velocities and astrometry, adopting two sets of line-of-sight distances from the literature. Methods. Four different sets of ages, masses, and absolute magnitudes in different photometric bands are obtained through an isochrone fitting method, considering different combinations of input parameters. The reddenings are obtained by comparing the observed colours with those obtained from the isochrone projection. Finally, the orbits are computed adopting an axisymmetric potential of the Galaxy. Results. Comparisons with reference catalogues of field and cluster stars suggest that reliable ages are obtained for stars younger than 9-10 Gyr when the estimated relative age uncertainty is < 50 per cent. For older stars, ages tend to be underestimated. The most reliable stellar type for age determination are turn-off stars, even when the input atmospheric parameters have large uncertainties. Ages for giants and main-sequence stars are retrieved with uncertainties of the order of 2Gyr when extinction towards the star's line of sight is less than AV ≤ 2.5 mag. Conclusions. The catalogue of ages, initial stellar masses, reddenings, galactocentric positions and velocities, as well as the stellar orbital actions, eccentricities, apocentre, pericentre and maximum distance from the Galactic plane reached during their orbits, is made publicly available to be downloaded. With this catalogue, the full chemo-dynamical properties of the extended solar neighbourhood unfold and allow us to better identify the properties of the spiral arms, to parametrise the dynamical heating of the disc, and to thoroughly study the chemical enrichment of the Milky Way.

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Contribution to journal
publication status
published
subject
keywords
Galaxy: kinematics and dynamics, Galaxy: stellar content, Stars: fundamental parameters
in
Astronomy and Astrophysics
volume
669
article number
A104
publisher
EDP Sciences
external identifiers
  • scopus:85146859847
ISSN
0004-6361
DOI
10.1051/0004-6361/202244283
language
English
LU publication?
yes
id
e5088d46-e39e-4443-b374-78a0cc8acd69
date added to LUP
2023-02-13 13:21:43
date last changed
2024-04-18 18:17:10
@article{e5088d46-e39e-4443-b374-78a0cc8acd69,
  abstract     = {{<p>Context.Gaia's third data release provides radial velocities for 33 million stars and spectroscopically derived atmospheric parameters for more than 5 million targets. When combined with the astrometric data, these allow us to derive orbital and stellar parameters that are key to understanding the stellar populations of the Milky Way and to perform Galactic archaeology. Aims. We used the calibrated atmospheric parameters, 2MASS and Gaia-EDR3 photometry, and parallax-based distances to compute the ages, initial stellar masses, and reddenings for the stars with spectroscopic parameters. We also derived the orbits for all of the stars with measured radial velocities and astrometry, adopting two sets of line-of-sight distances from the literature. Methods. Four different sets of ages, masses, and absolute magnitudes in different photometric bands are obtained through an isochrone fitting method, considering different combinations of input parameters. The reddenings are obtained by comparing the observed colours with those obtained from the isochrone projection. Finally, the orbits are computed adopting an axisymmetric potential of the Galaxy. Results. Comparisons with reference catalogues of field and cluster stars suggest that reliable ages are obtained for stars younger than 9-10 Gyr when the estimated relative age uncertainty is &lt; 50 per cent. For older stars, ages tend to be underestimated. The most reliable stellar type for age determination are turn-off stars, even when the input atmospheric parameters have large uncertainties. Ages for giants and main-sequence stars are retrieved with uncertainties of the order of 2Gyr when extinction towards the star's line of sight is less than AV ≤ 2.5 mag. Conclusions. The catalogue of ages, initial stellar masses, reddenings, galactocentric positions and velocities, as well as the stellar orbital actions, eccentricities, apocentre, pericentre and maximum distance from the Galactic plane reached during their orbits, is made publicly available to be downloaded. With this catalogue, the full chemo-dynamical properties of the extended solar neighbourhood unfold and allow us to better identify the properties of the spiral arms, to parametrise the dynamical heating of the disc, and to thoroughly study the chemical enrichment of the Milky Way.</p>}},
  author       = {{Kordopatis, G. and Schultheis, M. and McMillan, P. J. and Palicio, P. A. and De Laverny, P. and Recio-Blanco, A. and Creevey, O. and Álvarez, M. A. and Andrae, R. and Poggio, E. and Spitoni, E. and Contursi, G. and Zhao, H. and Oreshina-Slezak, I. and Ordenovic, C. and Bijaoui, A.}},
  issn         = {{0004-6361}},
  keywords     = {{Galaxy: kinematics and dynamics; Galaxy: stellar content; Stars: fundamental parameters}},
  language     = {{eng}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202244283}},
  doi          = {{10.1051/0004-6361/202244283}},
  volume       = {{669}},
  year         = {{2023}},
}