Projecte assignat
Títol: The age-metallicity relation in the solar neighbourhood as revealed by the Gaia satellite
Director/a: REBASSA MANSERGAS, ALBERTO
Departament: FIS
Títol: The age-metallicity relation in the solar neighbourhood as revealed by the Gaia satellite
Data inici oferta: 17-12-2024 Data finalització oferta: 17-07-2025
Estudis d'assignació del projecte:
GR ENG SIST AEROESP
| Tipus: Individual | |
| Lloc de realització: EETAC | |
| Segon director/a (UPC): RADDI, ROBERTO | |
| Paraules clau: | |
| Gaia satellite, white dwarfs, main sequence stars | |
| Descripció del contingut i pla d'activitats: | |
| The age-metallicity relation provides information of the chemical evolution of the Milky Way. Given the difficulties in measuring stellar ages, this relation is observationally uncosntrained. However, thanks to the Gaia satellite, we have proper motions, parallaxes, photometry and spectra of billions of stars in the Galaxy. In this work we will make use of binary stars identified by Gaia composed of a white dwarf and a main sequence star to constrain the age-metallicity relation. White dwarfs are stellar remnants from which one can derive accurate stellar ages, since they simply cool down in time. Main sequence stars are typical stars like the Sun from which metallicities can be obtained. Since the two stars are coeval in each binary system, we will be able to observationally constrain the properties of the age-metallicity relation.
Measuring metallicities generally requires high-resolution spectroscopy. However, several recent studies have provided such values directly from Gaia photometry or even Gaia low-resolution spectra for millions of stars. The idea is to gather such information for all the main sequence stars that are in our Gaia sample and in common with those studies. These values, together with the white dwarf ages that we will measure interpolating the Gaia photometry in the white dwarf cooling models, will allow us to derive the observed age-metallicity relation. This project is an extension of a long-term program that we are leading at the Group of Astronomy and Astrophysics based at the EETAC. It makes use of the superb astrometry, photometry and spectra provided by the Gaia satellite. |
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| Orientació a l'estudiant: | |
| The student will be required to get familiar with the Gaia satellite and the data that it provides. It will be necessary to deal with large data bases and to program to some extent. | |
| Requereix activitats hardware: No | |
| Requereix activitats software: No | |
| Horari d'atenció a estudiants per a l'assignació de projecte: |
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