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Identification of giant stars for mapping our galaxy in the S-PLUS survey

Grant number: 18/20977-2
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): April 01, 2019
Effective date (End): March 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal Investigator:Claudia Lucia Mendes de Oliveira
Grantee:Felipe de Almeida Fernandes
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope, AP.ESP

Abstract

Galactic astronomy is a science that still offers a great number of open questions: such as the origin of the Galactic structures, in part related to their stellar distributions; the problem of the missing satellites; and the identification of new overdensities and further analysis of their nature. In this study, we approach this problem through the use of giant stars as tracers of stellar populations.In this context, the S-PLUS survey has unique characteristics that enable this study: the great number of photometric filters, which are, in many cases, centered in absorption lines that are important for stellar astrophysics; and the extensive sky coverage, that allows us to study Galactic structures sampled by different fields.In order to select the giant stars in the survey, we will employ four different techniques: photometric search technique, principal component analysis, neural network classification and reduced parallax technique. We will produce a catalog of giant stars observed by S-PLUS, that will be used in this study and made available for the scientific community for other studies.Our main goal is to use this catalog to find new overdensities in the Galaxy and adjust models to describe the density profiles of several galactic structures, which has the potential to shed light to their origins.