Abstract
The first generation of stars is quite unique. The absence of metals likely affects their formation, with current models suggesting a much more top-heavy initial mass fraction than what we observe today, and some of their other properties, such as rotation rates and binarity, are largely unknown or constrained by direct observations. But even non-rotation single stars of a given mass will evolve quite differently due to the absence of the metals: the stars will mostly remain much more compact until their death, with the hydrogen-rich later reaching down ten teems deeper in radius than in modern stars. When they explode as supernovae, the exposure to the supernova neutrino flux is much enhanced, allowing for copious production of lithium. This production will not be constant for all stars but largely vary across the mass range. Such production even more challenges the presence of the Spite Plateau.
Original language | English |
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Title of host publication | Memorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society |
Editors | G Cescutti, A J Korn, P Ventura |
Place of Publication | Italy |
Publisher | Italian Astronomical Society (SAIt) |
Pages | 58-62 |
Number of pages | 5 |
Volume | 91 |
Edition | 1-2 |
Publication status | Published - 2020 |
Event | Lithium in the Universe: to Be or not to Be? - Monte Porzio Catone, Italy Duration: 18 Nov 2019 → 22 Nov 2019 https://lithiumintheuniverse.wixsite.com/lithium2019 |
Publication series
Name | Memorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society |
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Publisher | Societa Astronomica Italiana |
ISSN (Print) | 1824-016X |
Conference
Conference | Lithium in the Universe |
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Country/Territory | Italy |
City | Monte Porzio Catone |
Period | 18/11/19 → 22/11/19 |
Other | The meeting will bring together experts from various fields to discuss the role played by lithium in several astrophysical contexts and to highlight the extraordinary character of this chemical species, as a tracer of the structure and evolution of stars, galaxies and the Universe. The main topics of the meeting will be: * Big Bang nucleosynthesis * Nuclear reaction rates involving lithium and beryllium * Physical processes in stellar interiors as traced by Li, Be, and B * Hot bottom burning in massive AGB stars * Lithium depletion in pre-MS stars and brown dwarfs * Lithium and Beryllium in novae * Lithium in stellar clusters * Galaxy evolution * Lithium as tracer of the evolution of extra-galactic systems * Lithium and the First stars * Evolution in the disc and the bulge of the Milky Way * Li abundance modelling |
Internet address |
Keywords
- Abundance:Li
- Stars: abundances
- Stars: Population III
- Stars: Supernovae