Formation history of open clusters constrained by detailed asteroseismology of red giant stars observed by Kepler

Enrico Corsaro*, Yueh Ning Lee, Rafael A. García, Patrick Hennebelle, Savita Mathur, Paul G. Beck, Stephane Mathis, Dennis Stello, Jérôme Bouvier

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

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.

Original languageEnglish
Article number05002
JournalEPJ Web of Conferences
Volume160
DOIs
Publication statusPublished - 2017 Oct 27
Externally publishedYes
EventSeismology of the Sun and the Distant Stars 2016 - Using Today's Successes to Prepare the Future - TASC2 and KASC9 Workshop - SPACEINN and HELAS8 Conference - Terceira, Acores Islands, Portugal
Duration: 2016 Jul 112016 Jul 25

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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