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Stellar ages from asteroseismology
Yveline Lebreton, Josefina Montalban
Asteroseismology provides powerful means to probe stellar interiors. The oscillations frequencies are closely related to stellar interior properties via the density and sound speed…
The seismology programme of CoRoT
E. Michel, A. Baglin, M. Auvergne +1
We introduce the main lines and specificities of the CoRoT Seismology Core Programme. The development and consolidation of this programme has been made in the framework of the CoRo…
A seismic approach to testing different formation channels of subdwarf B stars
Haili Hu, M. -A. Dupret, C. Aerts +5
There are many unknowns in the formation of subdwarf B stars. Different formation channels are considered to be possible and to lead to a variety of helium-burning subdwarfs. All s…
Thorough analysis of input physics in CESAM and CLES codes
Josefina Montalban, Yveline Lebreton, Andrea Miglio +3
This contribution is not about the quality of the agreement between stellar models computed by CESAM and CLES codes, but more interesting, on what ESTA-Task~1 run has taught us abo…
Grids of Stellar Models and Frequencies with CLES + LOSC
J. Montalban, A. Miglio, A. Noels +1
We present a grid of stellar models, obtained with the CLES evolution code, following the specification of ESTA-Task1, and the corresponfing seismic properties, computed with the L…
CoRoT/ESTA-TASK 1 and TASK 3 comparison of the internal structure and seismic properties of representative stellar models: Comparisons between the ASTEC, CESAM, CLES, GARSTEC and STAROX codes
Yveline Lebreton, Josefina Montalban, Joergen Christensen-Dalsgaard +2
We compare stellar models produced by different stellar evolution codes for the CoRoT/ESTA project, comparing their global quantities, their physical structure, and their oscillati…
Gravity modes and mixed modes as probes of stellar cores in main-sequence stars: from solar-like to beta Cep stars
A. Miglio, J. Montalban, P. Eggenberger +1
We investigate how the frequencies of gravity modes depend on the detailed properties of the chemical composition gradient that develops near the core of main-sequence stars and, t…
The Liege Oscillation Code
R. Scuflaire, J. Montalban, S. Theado +5
The Liege Oscillation code can be used as a stand-alone program or as a library of subroutines that the user calls from a Fortran main program of his own to compute radial and non-…
Inter-comparison of the g-, f- and p-modes calculated using different oscillation codes for a given stellar model
A. Moya, J. Christensen-Dalsgaard, S. Charpinet +9
In order to make astroseismology a powerful tool to explore stellar interiors, different numerical codes should give the same oscillation frequencies for the same input physics. Th…
Revised instability domains of SPB and beta Cephei stars
Andrea Miglio, Josefina Montalban, Marc-Antoine Dupret
The excitation of pulsation modes in beta Cephei and Slowly Pulsating B stars is known to be very sensitive to opacity changes in the stellar interior where T~2 10^5 K. In this reg…
An asteroseismic study of the beta Cephei star theta Ophiuchi: constraints on global stellar parameters and core overshooting
M. Briquet, T. Morel, A. Thoul +5
We present a seismic study of the beta Cephei star theta Ophiuchi. Our analysis is based on the observation of one radial mode, one rotationally split l = 1 triplet and three compo…
Microscopic Diffusion in Stellar Evolution Codes: First Comparison results of ESTA-Task~3
Y. Lebreton, J. Montalban, J. Christensen-Dalsgaard +8
We present recent work undertaken by the Evolution and Seismic Tools Activity (ESTA) team of the CoRoT Seismology Working Group. The new ESTA-Task 3 aims at testing, comparing and…
Effect of convective outer layers modeling on non-adiabatic seismic observables of delta Scuti stars
J. Montalban, M. -A. Dupret
The identification of pulsation modes in delta Scuti stars is mandatory to constrain the theoretical stellar models. The non-adiabatic observables used in the photometric identific…
12 Bootis: a test bed for extra-mixing processes in stars
Andrea Miglio, Josefina Montalban, Carla Maceroni
12 Bootis is a spectroscopic binary whose visual orbit has been resolved by interferometry. Though the physical parameters of the system have been determined with an excellent prec…
Instability strips of main sequence B stars: a parametric study of iron enhancement
A. Miglio, P. -O. Bourge, J. Montalban +1
The discovery of beta Cephei stars in low metallicity environments, as well as the difficulty to theoretically explain the excitation of the pulsation modes observed in some beta C…
Instability strips of SPB and beta Cephei stars: the effect of the updated OP opacities and of the metal mixture
A. Miglio, J. Montalban, M. -A. Dupret
The discovery of Cephei stars in low metallicity environments, as well as the difficulty in theoretically explaining the excitation of the pulsation modes observed in some …
12 Bootis: the need for asteroseismic constraints
A. Miglio, J. Montalban, C. Maceroni +2
12 Bootis is a double-lined spectroscopic binary whose orbit has been resolved by interferometry. We present a detailed modelling of the system and show that the available observat…
Report on the CoRoT Evolution and Seismic Tools Activity
M. K. J. P. F. G. Monteiro, Y. Lebreton, J. Montalban +24
We present the work undertaken by the Evolution and Seismic Tools Activity (ESTA) team of the CoRoT Seismology Working Group. We have focused on two main tasks: Task 1 - now finish…
New light on the old problem of lithium pre--MS depletion: models with 2D RHD convection
Josefina Montalban, Francesca D'Antona
The Teff location of Pre-Main Sequence (PMS) evolutionary tracks depends on the treatment of over-adiabaticity. We present here the PMS evolutionary tracks computed by using the mi…
Evolution and seismology of alpha Centauri
Josefina Montalban, Andrea Miglio
Solar-like oscillations detected in both components of the binary system alpha Centauri provide strong constraints on the fundamental parameters of the stellar system. We model alp…
85Peg A: which age for a low metallicity solar like star?
F. D'Antona, D. Cardini, M. P. Di Mauro +3
We explore the possible evolutionary status of the primary component of the binary 85 Pegasi, listed as a target for asteroseismic observations by the MOST satellite. In spite of t…
Constraining fundamental stellar parameters using seismology. Application to Alpha Centauri AB
A. Miglio, J. Montalban
We apply the Levenberg-Marquardt minimization algorithm to seismic and classical observables of the Alpha Cen binary system in order to derive the fundamental parameters of Alpha C…
Models of Stellar structure for asteroseismology
F. D'Antona, J. Montalban, I. Mazzitelli
Among the problems still open in the study of stellar structure, we discuss in particular some issues related to the study of convection. We have recently built up complete stellar…
Solar model with CNO revised abundances
J. Montalban, A. Miglio, A. Noels +3
Recent three-dimensional, NLTE analyses of the solar spectrum have shown a significant reduction in the C, N, O and Ne abundances leading to a Z/X ratio of the order of 0.0177. We…