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Archivio digitale delle tesi discusse presso l’Università di Pisa

Tesi etd-02062023-145454


Tipo di tesi
Tesi di laurea magistrale
Autore
PELLEGRINI, FRANCESCO
URN
etd-02062023-145454
Titolo
Models for extremely metal-poor stars
Dipartimento
FISICA
Corso di studi
FISICA
Relatori
relatore Prof.ssa Degl'Innocenti, Scilla
relatore Prof. Prada Moroni, Pier Giorgio
Parole chiave
  • metal-poor stars
  • Population II stars
  • Population III stars
  • stellar evolution
  • stellar interiors
Data inizio appello
27/02/2023
Consultabilità
Non consultabile
Data di rilascio
27/02/2026
Riassunto
Over the years, several metal-deficient stars have been detected and analyzed by numerous surveys. To enable the detailed interpretation of their observational properties, theoretical stellar models simulating their evolution are required. Currently, in the literature, all the renowned and broadly-employed databases of evolutionary models cover intervals in metallicity “Z” from, approximately, 0.00001, i.e. the distinctive lowest value for stars in old globular clusters, to 0.01, typical of the Sun-like and metal-rich structures. The purpose of this research was to compute an extended library of models (i) to examine the features of the most metal-poor stars ever observed, potentially characterized by values of “Z” smaller than 0.00001 and (ii) to verify the theoretical predictions regarding the stellar evolution at exceptionally low metallicities, fascinatingly different compared to that of more metal-rich structures like the Sun. The newly-calculated database, which is the result of the work of this thesis, consists of more than four hundred models spanning wide ranges of masses and metallicities “Z”, particularly for values of “Z” lower than 0.00001.
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