Gaia/GSP-spec spectroscopic properties of γ Doradus pulsators.
| Title: | Gaia/GSP-spec spectroscopic properties of γ Doradus pulsators. |
|---|---|
| Authors: | de Laverny, P.1 (AUTHOR) laverny@oca.eu, Recio-Blanco, A.1 (AUTHOR), Aerts, C.2,3,4 (AUTHOR), Palicio, P. A.1 (AUTHOR) |
| Source: | Astronomy & Astrophysics / Astronomie et Astrophysique. 2024, Vol. 691, p1-9. 9p. |
| Subject Terms: | *LOW mass stars, *STELLAR evolution, *VARIABLE stars, *DATA release, *MILKY Way |
| Abstract: | Context. The third Data Release of the ESA Gaia mission has provided a large sample of new gravity-mode pulsators, among which more than 11 600 are γ Dor stars. Aims. 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. Methods. 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. Results. 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 Gaiaγ Dor pulsators. Their Teff were found to be between ∼6500 and ∼7800 K, log(g) is around 4.2, and the luminosities and stellar radii peak at ∼5 L⊙ and ∼1.7 R⊙, The median metallicity is close to the Solar value, although γ Dor with higher and lower metallicities by about ±0.5 dex were also identified. The [α/Fe] content is fully consistent with the chemical properties of the Galactic disc. Conclusions.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. [ABSTRACT FROM AUTHOR] |
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| Items | – Name: Title Label: Title Group: Ti Data: Gaia/GSP-spec spectroscopic properties of γ Doradus pulsators. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22de+Laverny%2C+P%2E%22">de Laverny, P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> laverny@oca.eu</i><br /><searchLink fieldCode="AR" term="%22Recio-Blanco%2C+A%2E%22">Recio-Blanco, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aerts%2C+C%2E%22">Aerts, C.</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Palicio%2C+P%2E+A%2E%22">Palicio, P. A.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Astronomy+%26+Astrophysics+%2F+Astronomie+et+Astrophysique%22">Astronomy & Astrophysics / Astronomie et Astrophysique</searchLink>. 2024, Vol. 691, p1-9. 9p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22LOW+mass+stars%22">LOW mass stars</searchLink><br />*<searchLink fieldCode="DE" term="%22STELLAR+evolution%22">STELLAR evolution</searchLink><br />*<searchLink fieldCode="DE" term="%22VARIABLE+stars%22">VARIABLE stars</searchLink><br />*<searchLink fieldCode="DE" term="%22DATA+release%22">DATA release</searchLink><br />*<searchLink fieldCode="DE" term="%22MILKY+Way%22">MILKY Way</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Context. The third Data Release of the ESA Gaia mission has provided a large sample of new gravity-mode pulsators, among which more than 11 600 are γ Dor stars. Aims. 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. Methods. 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. Results. 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 Gaiaγ Dor pulsators. Their Teff were found to be between ∼6500 and ∼7800 K, log(g) is around 4.2, and the luminosities and stellar radii peak at ∼5 L⊙ and ∼1.7 R⊙, The median metallicity is close to the Solar value, although γ Dor with higher and lower metallicities by about ±0.5 dex were also identified. The [α/Fe] content is fully consistent with the chemical properties of the Galactic disc. Conclusions.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. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Astronomy & Astrophysics / Astronomie et Astrophysique is the property of EDP Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1051/0004-6361/202451501 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 1 Subjects: – SubjectFull: LOW mass stars Type: general – SubjectFull: STELLAR evolution Type: general – SubjectFull: VARIABLE stars Type: general – SubjectFull: DATA release Type: general – SubjectFull: MILKY Way Type: general Titles: – TitleFull: Gaia/GSP-spec spectroscopic properties of γ Doradus pulsators. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: de Laverny, P. – PersonEntity: Name: NameFull: Recio-Blanco, A. – PersonEntity: Name: NameFull: Aerts, C. – PersonEntity: Name: NameFull: Palicio, P. A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: 2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 00046361 Numbering: – Type: volume Value: 691 Titles: – TitleFull: Astronomy & Astrophysics / Astronomie et Astrophysique Type: main |
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