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Asteroseismology of red giant stars: a tool for constraining stellar models

Bossini, Diego (2016)
Ph.D. thesis, University of Birmingham.

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The aim of this thesis is to study stellar evolution and asteroseimology of red-giant stars mainly from a modelling point of view, in particular the impact on core-convective-burning stars of adopting different mixing schemes.

Thanks to NASA space telescope Kepler, asteroseismology of thousands of giants provided us new information related to their internal structure, that can be used for finding constraints on their cores.

I used several stellar evolution codes (MESA, BaSTI, and PARSEC) to investigate the effect of different mixing schemes in the helium-core-burning stars. Comparing them with observed stars, I concluded that standard stellar models, largely used in literature, cannot describe the combined observed distribution of luminosity and period spacing. I then proposed as solution a penetrative convection model with moderate overshooting parameter. Additional tests on Kepler's open clusters (NGC6791 and NGC6819) and secondary clump stars, allowed me to revised to my mixing model.

Type of Work:Ph.D. thesis.
Supervisor(s):Miglio, Andrea and Chaplin, William J.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Additional Information:

Publications arising from thesis:

A. Miglio, W. J. Chaplin, K. Brogaard, M. N. Lund, B. Mosser, G. R. Davies, R. Handberg, A. P. Milone, A. F. Marino, D. Bossini, Y. P. Elsworth, F. Grundahl, T. Arentoft, L. R. Bedin, T. L. Campante, J. Jessen-Hansen, C. D. Jones, J. S. Kuszlewicz, L. Malavolta, V. Nascimbeni, and E. L. Sandquist
Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission
MNRASL 2016 : slw102v1-slw102.

N. Lagarde, D. Bossini, A. Miglio, M. Vrard, and B. Mosser
Testing the cores of first ascent red giant stars using the period spacing of g modes
MNRASL 2016 457: L59-L63.

Campante, T. L.; Lund, M. N.; Kuszlewicz, J. S.; Davies, G. R.; Chaplin, W. J.; Albrecht, S.; Winn, J. N.; Bedding, T. R.; Benomar, O.; Bossini, D.; Handberg, R.; Santos, A. R. G.; Van Eylen, V.; Basu, S.; Christensen- Dalsgaard, J.; Elsworth, Y. P.; Hekker, S.; Hirano, T.; Huber, D.; Karoff, C.; Kjeldsen, H.; Lundkvist, M. S.; North, T. S. H.; Silva Aguirre, V.; Stello, D.; White, T. R.,
Spin-orbit alignment of exoplanet systems: ensemble analysis using asteroseismology
2016 The Astrophysical Journal 830 138

Diego Bossini, Andrea Miglio, Maurizio Salaris, Adriano Pietrinferni, Josefina Montalbán, Alessandro Bressan, Arlette Noels, Santi Cassisi, Léo Girardi, and Paola Marigo
Uncertainties on near-core mixing in red-clump stars: effects on the period spacing and on the luminosity of the AGB bump
MNRAS 2015 453: 2290-2301.

Thaíse S. Rodrigues, Léo Girardi, Andrea Miglio, Diego Bossini, Jo Bovy, Courtney Epstein, Marc H. Pinsonneault, Dennis Stello, Gail Zasowski, Carlos Allende Prieto, William J. Chaplin, Saskia Hekker, Jennifer A. Johnson, Szabolcs Mészáros, Benoît Mosser, Friedrich Anders, Sarbani Basu, Timothy C. Beers, Cristina Chiappini, Luiz A.N. da Costa, Yvonne Elsworth, Rafael A. García, Ana E. García Pérez, Fred R. Hearty, Marcio A.G. Maia, Steven R. Majewski, Savita Mathur, Josefina Montalbán, David L. Nidever, Basilio Santiago, Mathias Schultheis, Aldo Serenelli, and Matthew Shetrone
Bayesian distances and extinctions for giants observed by Kepler and APOGEE
MNRAS 2014 445: 2758-2776.

Subjects:QB Astronomy
QC Physics
Institution:University of Birmingham
ID Code:7090
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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