The [Y/Mg] chemical clock in cool moderately metal-poor stars

• Grant number: 25/04943-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2025
• End date: December 31, 2025
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
• Principal Investigator: Jorge Luis Melendez Moreno
• Grantee: José Hamilton Pereira de Araujo Neto
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 18/04055-8 - High precision spectroscopy: from the first stars to planets, AP.TEM

Abstract

Age is a fundamental parameter in Astrophysics, as it has a direct impact on different areas, such as research on exoplanets, stellar evolution and the evolution of the Galaxy. However, all methods present significant uncertainties (> 1 Gyr). One of the most promising methods developed in the last decade is the [Y/Mg] chemical clock. This method has been developed mainly using solar twin stars, but it is important to verify whether it can be applied to other types of stars. The aim of the project is to study moderately metal-poor stars of early K and late G types, for which the method has not yet been tested in detail. Extending this technique to different types of stars will allow a larger number of them to have their age determined using this method.