Atmospheric parameters and chemical properties of red giants in the CoRoT asteroseismology fields
- Author(s)
- T. Morel, Andrea Miglio, N. Lagarde, Thomas Kallinger, Markus Hareter, Josefina Montalbán, M. Rainer, Ennio Poretti, P. Eggenberger, Saskia Hekker, Benoit Mosser, M. Valentini, Fabien Carrier, Luciano Mantegazza
- Abstract
A precise characterisation of the red giants in the seismology fields of the CoRoT satellite is a prerequisite for further in-depth seismic modelling. High-resolution FEROS and HARPS spectra were obtained as part of the ground-based follow-up campaigns for 19 targets holding great asteroseismic potential. These data are used to accurately estimate their fundamental parameters and the abundances of 16 chemical species in a self-consistent manner. Some powerful probes of mixing are investigated (the Li and CNO abundances, as well as the carbon isotopic ratio in a few cases). The information provided by the spectroscopic and seismic data is combined to provide more accurate physical parameters and abundances. The stars in our sample follow the general abundance trends as a function of the metallicity observed in stars of the Galactic disk. After an allowance is made for the chemical evolution of the interstellar medium, the observational signature of internal mixing phenomena is revealed through the detection at the stellar surface of the products of the CN cycle. A contamination by NeNa-cycled material in the most massive stars is also discussed. With the asteroseismic constraints, these data will pave the way for a detailed theoretical investigation of the physical processes responsible for the transport of chemical elements in evolved, low- and intermediate-mass stars.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- INAF Osservatorio Astronomico di Brera, Université de Genève, University of Amsterdam (UvA), Université de Liège, Leibniz-Institut für Astrophysik Potsdam, Katholieke Universiteit Leuven, University of Birmingham, Aarhus University, Max Planck Institute for Solar System Research, Paris Observatory
- Journal
- Astronomy & Astrophysics
- Volume
- 564
- No. of pages
- 20
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201322810
- Publication date
- 04-2014
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/a954946f-c201-44bb-80e1-949369432a3e