Identificação de estrelas do tipo A na base de dados do S-PLUS e estimativas de seus parâmetros atmosféricos

Abstract

This work aims to identify candidate A-type stars within the Southern Photometric Local Universe Survey (S-PLUS) database. The data from this purely photometric survey were cross-matched with other databases to gather reference spectroscopic and astrometric information. Through comparisons, limits were defined for the selection of A-type stars using S-PLUS photometry. With the aid of a robust statistical tool, the Gaussian Mixture Model (GMM), criteria were established to distinguish between blue horizontal branch (BHB) stars and main sequence stars in a sample of A-type stars from S-PLUS. The main atmospheric parameters, like Teff , log g and [Fe/H], were determined for thousands of A-type stars using a symbolic regression software. Finally, the distance were estimated through an absolute magnitude calibration for the selected BHB stars.