Dissertation Defense
StudentMorgan Sabino Camargo
Program: Astronomia
Title: "Stellar atmospheric parameters for the Panchromatic Stellar Atlas (PaStA)"
Advisor: Prof. Dr. Ramachrisna Teixeira - IAG/USP
Judging Committee:
- Prof. Dr. Ramachrisna Teixeira - IAG/USP
- Prof. Dr. Marcos Perez Diaz - IAG/USP
- Profa. Dra. Lucimara Pires Martins – UNICID
- Dra. Simone Daflon dos Santos - ON
Abstract
The Panchromatic Stellar Atlas (PaStA) is a stellar atlas covering most of the sky containing high precision astrometric measurements, in a way that we can derive distance straight from the parallax inversion. It is built crossmatching the surveys Gaia, AllWISE and GALEX All-Sky Imaging Survey. PaStA contains photometric data from 12 bands for around 10 million stars, ranging from infrared to ultraviolet, astrometric data, interstellar extinction correction and atmospheric parameters of effective temperature (Teff), superficial gravity (logg), and metallicity ([Fe/H]). Building the catalogue requires selection criteria for quality and homogeneity guarantee of the data that comes from different sources. We apply to the catalogue the data from spectroscopic surveys Gaia-ESO Public Spectroscopic Survey, APOGEE, LAMOST, and SEGUE, containing pipelines that derive atmospheric parameters using different methodologies. We study, for a limited set of stars, the precision and behaviour of these surveys with each other, building a ranking used for selecting which set of parameters to apply to PaStA. We present the full catalogue of 10 million objects, containing photometric data, astrometry, reddening, and atmospheric parameters for around 1 million objects. We discuss future updates of the catalogue, applications and paths on how PaStA can contribute to different studies.
Keywords: stellar astrophysics, atmospheric parameters, catalogues, interstellar reddening.