Modeling of emission lines in low-ionization windsof B-type stars

MERCANTI, L.V.; CIDALE, L. S.; TORRES, A. F.; COCHETTI, Y. R.; KRAUS, MICHAELA

Rosario (Virtual)

Congreso; 62ª Reunión Anual de la Asociación Argentina de Astronomía; 2020

Facultad de Ciencias Exactas, Ingeniería y Agrimensura de la Universidad Nacional de Rosario y el Complejo Astronómico Municipal "Galileo Galileo"

Motivated by the availability of new observational material provided by Gaia mission, and focusedon peculiar B-type stars, we develop a model to simulate the non-LTE line profiles of ionized elements such as Ca ii and Mg ii. The calculation is performed for a range of effective temperature and surface gravity, for different temperature and velocity distributions of the circumstellar material as well as different stellar mass-loss rates. The obtained synthetic profiles are capable of reproducing the general features of the observed spectral lines, such as P Cygni-type profiles.