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Input from opacity data in computation of pulsation instability
Josefina Montalbán, Andrea Miglio
Several types of variable stars are found along the HR diagram whose pulsations are driven by the -mechanism. Given their nature, the precise () domain where thes…
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…
Analysis of 70 Ophiuchi AB including seismic constraints
P. Eggenberger, A. Miglio, F. Carrier +2
The analysis of solar-like oscillations for stars belonging to a binary system provides a unique opportunity to probe the internal stellar structure and to test our knowledge of st…
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…
The effect of turbulent mixing on the g-mode spectrum of MS stars
J. Montalban, A. Miglio, P. Eggenberger +1
The understanding of transport processes inside the stars is one of the main goals of asteroseismology. Chemical turbulent mixing can affect the internal distribution of μnear the…
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-…
CLES, Code Liegeois d'Evolution Stellaire
R. Scuflaire, S. Theado, J. Montalban +5
Cles is an evolution code recently developed to produce stellar models meeting the specific requirements of studies in asteroseismology. It offers the users a lot of choices in the…
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…
Close-up of primary and secondary asteroseismic CoRoT targets and the ground-based follow-up observations
K. Uytterhoeven, E. Poretti, M. Rainer +13
To optimise the science results of the asteroseismic part of the CoRoT satellite mission a complementary simultaneous ground-based observational campaign is organised for selected…
Asteroseismology and Interferometry
M. S. Cunha, C. Aerts, J. Christensen-Dalsgaard +22
Asteroseismology provides us with a unique opportunity to improve our understanding of stellar structure and evolution. Recent developments, including the first systematic studies…
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…
The convective envelope in gamma Doradus stars: theoretical uncertainties
J. Montalban, A. Miglio, S. Theado
The depth of the convective envelope plays a fundamental role in the driving mechanism proposed by Guzik et al. (2000) to explain the high-order g modes of gamma Dor pulsators. In…
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…
A Splinter Session on the Thorny Problem of Stellar Ages
Eric E. Mamajek, David Barrado y Navascues, Sofia Randich +4
Accurate stellar ages remain one of the most poorly constrained, but most desired, astronomical quantities. Here we briefly summarize some recent efforts to improve the stellar age…
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…
Probable nonradial g-mode pulsation in early A-type stars
E. Antonello, L. Mantegazza, M. Rainer +1
A survey for line profile variability in early A-type stars has been performed in order to detect nonradial pulsation signatures. The star HR 6139, with spectral type A2V and estim…
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…
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…