Analytical solutions for radiation-driven winds in massive stars - II. The delta-slow regime

Araya, I; Christen, A.; Cure, M.; Cidale, L. S.; Venero, R. O. J.; Arcos, C.; Gormaz-Matamala, A. C.; Haucke, M.; Escarate, P.; Claveria, H.

Abstract

Accurate mass-loss rates and terminal velocities from massive stars winds are essential to obtain synthetic spectra from radiative transfer calculations and to determine the evolutionary path of massive stars. From a theoretical point of view, analytical expressions for the wind parameters and velocity profile would have many advantages over numerical calculations that solve the complex non-linear set of hydrodynamic equations. In a previous work, we obtained an analytical description for the fast wind regime. Now, we propose an approximate expression for the line-force in terms of new parameters and obtain a velocity profile closed-form solution (in terms of the Lambert W function) for the delta-slow regime. Using this analytical velocity profile, we were able to obtain the mass-loss rates based on the m-CAK theory. Moreover, we established a relation between this new set of line-force parameters with the known stellar and m-CAK line-force parameters. To this purpose, we calculated a grid of numerical hydrodynamical models and performed a multivariate multiple regression. The numerical and our descriptions lead to good agreement between their values.

Más información

Título según WOS: Analytical solutions for radiation-driven winds in massive stars - II. The delta-slow regime
Título de la Revista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volumen: 504
Número: 2
Editorial: OXFORD UNIV PRESS
Fecha de publicación: 2021
Página de inicio: 2550
Página final: 2556
DOI:

10.1093/MNRAS/STAB995

Notas: ISI