Formation history of open clusters constrained by detailed asteroseismology of red giant stars observed by Kepler
Journal
Date Issued
2017
Author(s)
•
Lee, Yueh-Ning
•
García, Rafael A.
•
Hennebelle, Patrick
•
Mathur, Savita
•
Beck, Paul G.
•
Mathis, Stephane
•
Stello, Dennis
•
Bouvier, Jérôme
Abstract
Stars originate by the gravitational collapse of a turbulent molecular cloud of a diffuse medium, and are often observed to form clusters. Stellar clusters therefore play an important role in our understanding of star formation and of the dynamical processes at play. However, investigating the cluster formation is diffcult because the density of the molecular cloud undergoes a change of many orders of magnitude. Hierarchical-step approaches to decompose the problem into different stages are therefore required, as well as reliable assumptions on the initial conditions in the clouds. We report for the first time the use of the full potential of NASA Kepler asteroseismic observations coupled with 3D numerical simulations, to put strong constraints on the early formation stages of open clusters. Thanks to a Bayesian peak bagging analysis of about 50 red giant members of NGC 6791 and NGC 6819, the two most populated open clusters observed in the nominal Kepler mission, we derive a complete set of detailed oscillation mode properties for each star, with thousands of oscillation modes characterized. We therefore show how these asteroseismic properties lead us to a discovery about the rotation history of stellar clusters. Finally, our observational findings will be compared with hydrodynamical simulations for stellar cluster formation to constrain the physical processes of turbulence, rotation, and magnetic fields that are in action during the collapse of the progenitor cloud into a proto-cluster.
Coverage
Seismology of the Sun and the Distant Stars 2016 – Using Today’s Successes to Prepare the Future – TASC2 & KASC9 Workshop – SPACEINN & HELAS8 Conference
All editors
Monteiro, M.J.P.F.G.; Cunha, M.S.; Ferreira, J.M.T.S.
Volume
160
Start page
05002
Conferenece
Seismology of the Sun and the Distant Stars 2016 – Using Today’s Successes to Prepare the Future – TASC2 & KASC9 Workshop – SPACEINN & HELAS8 Conference
Conferenece place
Açores Islands, Portugal
Conferenece date
11-25 July, 2016
Issn Identifier
2101-6275
Ads BibCode
2017EPJWC.16005002C
Rights
open.access
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