New Hydrodynamic Solutions for Line-driven Winds of Hot Massive Stars Using the Lambert W-function

Vista sencilla de ítem
dc.contributor.authorGormaz-Matamala, A. C.
dc.contributor.authorCuré, M.
dc.contributor.authorHillier, D. J.
dc.contributor.authorNajarro, F.
dc.contributor.authorKubátová, B.
dc.contributor.authorKubát, J.
dc.date.accessioned2022-11-30T02:46:24Z
dc.date.available2022-11-30T02:46:24Z
dc.date.issued2021
dc.description.abstractHot massive stars present strong stellar winds that are driven by absorption, scattering, and reemission of photons by the ions of the atmosphere (line-driven winds). A better comprehension of this phenomenon, and a more accurate calculation of hydrodynamics and radiative acceleration, is Required to reduce the number of free parameters in spectral fitting and to determine accurate wind parameters such as mass-loss rates and velocity profiles. We use the non-LTE model-atmosphere code CMFGEN to numerically solve the radiative transfer equation in the stellar atmosphere and to calculate the radiative acceleration grad(r). Under the assumption that the radiative acceleration depends only on the radial coordinate, we solve analytically the equation of motion by means of the Lambert W-function. An iterative procedure between the solution of the radiative transfer and the equation of motion is executed in order to obtain a final self-consistent velocity field that is no longer based on any β-law. We apply the Lambert-procedure to three O supergiant stars (ζ Puppis, HD 165763, and α Cam) and discuss the Lambert solutions for the velocity profiles. It is found that, even without recalculation of the mass-loss rate, the Lambert-procedure allows the calculation of consistent velocity profiles that reduce the number of free parameters when a spectral fitting using CMFGEN is performed. Synthetic spectra calculated from our Lambert solutions show significant differences compared to the initial β-law CMFGEN models. The results indicate the importance of consistent velocity profile calculation in the CMFGEN code and its use in a fitting procedure and interpretation of observed spectra.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.file.nameGormaz_New2021.pdf
dc.identifier.citationA. C. Gormaz-Matamala et al 2021 ApJ 920 64en_ES
dc.identifier.doi10.3847/1538-4357/ac12c9
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7354
dc.languageen
dc.publisherAmerican Astronomical Society
dc.rights© 2021. The American Astronomical Society. All rights reserved
dc.sourceThe Astrophysical Journal
dc.subjectSTELLAR WINDSen_ES
dc.subjectHYDRODYNAMICSen_ES
dc.subjectEARLY-TYPE STARSen_ES
dc.subjectO STARSen_ES
dc.subjectRADIATIVE TRANSFERen_ES
dc.subjectSTELLAR ATMOSPHERESen_ES
dc.titleNew Hydrodynamic Solutions for Line-driven Winds of Hot Massive Stars Using the Lambert W-function
dc.typeArticulo
uv.departamentoInstituto de Fisica y Astronomia

Archivos

Bloque original
Mostrando 1 - 1 de 1
Miniatura
Nombre:
Gormaz_New2021.pdf
Tamaño:
6.66 MB
Formato:
Adobe Portable Document Format
Descargar

Colecciones

Artículos investigadores UV