Počet záznamů: 1
New Hydrodynamic Solutions for Line-driven Winds of Hot Massive Stars Using the Lambert W-function
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SYSNO ASEP 0548005 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název New Hydrodynamic Solutions for Line-driven Winds of Hot Massive Stars Using the Lambert W-function Tvůrce(i) Gormaz-Matamala, A. C. (CL)
Curé, M. (CL)
Hillier, D. J. (US)
Najarro, F. (ES)
Kubátová, Brankica (ASU-R) RID, ORCID
Kubát, Jiří (ASU-R) RID, ORCIDČíslo článku 64 Zdroj.dok. Astrophysical Journal - ISSN 0004-637X
Roč. 920, č. 1 (2021)Poč.str. 30 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova stellar winds ; hydrodynamics ; early-type stars Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) Způsob publikování Omezený přístup Institucionální podpora ASU-R - RVO:67985815 UT WOS 000706851300001 EID SCOPUS 85117716875 DOI 10.3847/1538-4357/ac12c9 Anotace 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 g (rad)(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 beta-law. We apply the Lambert-procedure to three O supergiant stars (zeta Puppis, HD 165763, and alpha 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 beta-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. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2022 Elektronická adresa https://doi.org/10.3847/1538-4357/ac12c9
Počet záznamů: 1