Reference : Galactic archaeology: mapping and dating stellar populations with asteroseismology of...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/143642
Galactic archaeology: mapping and dating stellar populations with asteroseismology of red-giant stars
English
Miglio, A. mailto [School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT; Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA;]
Chiappini, C. [Leibniz-Institut fur Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany]
Morel, Thierry mailto [Université de Liège - ULiège > > GAPHE : Astrophysique observationnelle (sol et espace) >]
Barbieri, M. [Dipartimento di Astronomia, Vicolo Osservatorio 3, Universit di Padova, I-35122 Padova, Italy]
Chaplin, W. J. [School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT]
Girardi, L. [INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy]
Montalban Iglesias, Josefa mailto [Institut d'Astrophysique et de Géophysique de l'Université de Liège, Allée du 6 Août, 17 B-4000 Liège, Belgium]
Valentini, Marica mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Mosser, B. [LESIA, CNRS, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, F-92195 Meudon cedex, France]
Baudin, F. [Institut d'Astrophysique Spatiale, Univ Paris-Sud, UMR8617, CNRS, Btiment 121, F-91405 Orsay Cedex, France]
Casagrande, L. [Research School of Astronomy & Astrophysics, Mount Stromlo Observatory, The Australian National University, ACT 2611, Australia]
Fossati, L. [Argelander-Institut für Astronomie der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany]
Aguirre, V. Silva [Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark]
Baglin, A. [LESIA, CNRS, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, F-92195 Meudon cedex, France)]
1-Feb-2013
Monthly Notices of the Royal Astronomical Society
429
423-428
Yes
International
[en] asteroseismology ; stars: distances ; Galaxy: disc
[en] Our understanding of how the Galaxy was formed and evolves is severely hampered by the lack of precise constraints on basic stellar properties such as distances, masses and ages. Here, we show that solar-like pulsating red giants represent a well-populated class of accurate distance indicators, spanning a large age range, which can be used to map and date the Galactic disc in the regions probed by observations made by the CoRoT and Kepler space telescopes. When combined with photometric constraints, the pulsation spectra of such evolved stars not only reveal their radii, and hence distances, but also provide well-constrained estimates of their masses, which are reliable proxies for the ages of the stars. As a first application, we consider red giants observed by CoRoT in two different parts of the Milky Way, and determine precise distances for ˜2000 stars spread across nearly 15 000 pc of the Galactic disc, exploring regions which are a long way from the solar neighbourhood. We find significant differences in the mass distributions of these two samples which, by comparison with predictions of synthetic models of the Milky Way, we interpret as mainly due to the vertical gradient in the distribution of stellar masses (hence ages) in the disc. In the future, the availability of spectroscopic constraints for this sample of stars will not only improve the age determination, but also provide crucial constraints on age-velocity and age-metallicity relations at different Galactocentric radii and heights from the plane.
http://hdl.handle.net/2268/143642
10.1093/mnras/sts345
http://adsabs.harvard.edu/abs/2013MNRAS.429..423M
http://de.arxiv.org/abs/1211.0146

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