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Institut d'Astrophysique et
de Géophysique (Bât. B5c)

Quartier Agora
Allée du 6 août, 19C
B-4000 Liège 1 (Sart-Tilman)
Belgique

Tel.: 04.366.9774
Fax: 04.366.9729

Séminaires

Des séminaires sont régulièrement organisés pour permettre aux chercheurs du Département ainsi qu'à des scientifiques extérieurs de présenter les dernières découvertes dans leurs domaines.
Vous y êtes cordialement invités :

03/05/2018 :
15h45  
On the determination of stellar ages, masses and radii from theoretical models
Andrea Bonfanti
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Recherche avancée
Jeudi 03 mai, 15h45 (7ème séminaire 2018 - affiche) 
On the determination of stellar ages, masses and radii from theoretical models
Andrea Bonfanti (STAR)

Salle de réunion AGO (local -1/14), Institut d'Astrophysique et de Géophysique
Bâtiment B5c, Quartier Agora, Allée du 6 Août, 19C, B-4000 Liège 1 (Sart-Tilman)


Determining the ages of stars is a very challenging task. Several indicators are available, but no single method works well for a broad range of spectral type or for each evolutionary phase of a star. My PhD project was related to the building of an algorithm for the determination of stellar ages, considering evolutionary tracks and isochrones. This model-dependent approach, which has been complemented by using gyrochronology, stellar magnetic activity and scaling relations coming from asteroseismology, also enables to retrieve other useful stellar parameters such as radius or mass. Here I will briefly discuss the problems of inferring ages from theoretical models and the characterization of solar-type stars of the solar neighbourhood, with a specific attention to the realistic uncertainties to be attributed to the main stellar parameters as a sum of internal and model-related ones. Moreover, considering that the determination of exoplanet properties requires the knowledge of stellar parameters, I will also show you the synergy between the characterization of stars and the exoplanetary science with particular references to the future Cheops mission and the analysis of stellar light curves.


Café, thé et biscuits seront servis après le séminaire...
Université de Liège > Faculté des Sciences > Département d'Astrophysique, Géophysique et Océanographie : CoWebAGO, Juin 2009.