| Texto completo | |
| Autor(es): |
Suffak, M. W.
;
Jones, C. E.
;
Carciofi, A. C.
;
de Amorim, T. H.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 526, n. 1, p. 20-pg., 2023-09-26. |
| Resumo | |
We use the three-dimensional Monte Carlo radiative transfer code hdust to model Be stars where the disc is tilted from the equatorial plane of the star. We compute 128 models across four spectral types, B0, B2, B5, and B8, tilting the disc by 0, 10(degrees), 20(degrees), and 40(degrees), respectively, while varying disc density according to spectral type. We also compute every model for an average and high stellar rotation rate. We first discuss non-tilted disc temperatures and show its nonlinear dependence on stellar and disc parameters. We find that tilting the disc minimally affects the density-weighted average disc temperature, but tilting does create a temperature asymmetry in disc cross-sections, which is more pronounced for a faster rotation rate. We also investigate the effect tilting has on V-band magnitude, polarization, and the H alpha line. Tilting the disc does affect these observables, but the changes are entirely dependent on the position of the observer relative to the direction of tilt. We find the observables that distinguish tilting from a change in density or geometry are the H alpha line shapes, where it can transition between single-peaked and double-peaked, and the polarization position angle, whose value is dependent on the projected major elongation axis of the disc on the sky. We also present one early- and one late-type model with warped discs. We find their temperature structure varies a small amount from the uniformly tilted models, and the different observables correspond to different tilt angles, consistent with their expected volume of origin within the disc. (AU) | |
| Processo FAPESP: | 21/01891-2 - Simulações hidrodinâmicas 3-D acopladas com transferência radiativa |
| Beneficiário: | Tajan Henrique de Amorim |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 18/04055-8 - Espectroscopia de alta precisão: das primeiras estrelas aos planetas |
| Beneficiário: | Jorge Luis Melendez Moreno |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/13354-1 - Discos de decréscimo e outflows em torno de estrelas em rápida rotação |
| Beneficiário: | Alex Cavaliéri Carciofi |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |