| Texto completo | |
| Autor(es): |
Labadie-Bartz, Jonathan
;
Carciofi, Alex C.
;
de Amorim, Tajan Henrique
;
Rubio, Amanda
;
Figueiredo, Andre Luiz
;
dos Santos, Pedro Ticiani
;
Thomson-Paressant, Keegan
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ASTRONOMICAL JOURNAL; v. 163, n. 5, p. 36-pg., 2022-05-01. |
| Resumo | |
TESS photometry is analyzed for 430 classical Be stars observed in the first year of the mission. The often complex and diverse variability of each object in this sample is classified to obtain an understanding of the behavior of this class as a population. Ninety-seven percent of the systems are variable above the noise level, with timescales spanning nearly the entire range of what is accessible with TESS, from tens of minutes to tens of days. The variability seen with TESS is summarized as follows. Nearly every system contains multiple periodic signals in the frequency regime between about 0.5 and 4 day(-1). One or more groups of closely spaced frequencies is the most common feature, present in 87% of the sample. Among the Be stars with brightening events that are characteristic of mass ejection episodes (18% of the full sample, or 31% of early-type stars), all have at least one frequency group, and the majority of these (83%) show a concurrent temporary amplitude enhancement in one or more frequency groups. About one-third (34%) of the sample is dominated by longer-term trends (timescales >2 day). Low-frequency stochastic signals are prominent in about 25% of the sample, with varying degrees of intensity. Higher-frequency signals (6 < f < 15 day(-1)) are sometimes seen (in 15% of the sample) and in most cases likely reflect p-mode pulsation. In rare cases (similar to 3%), even higher frequencies beyond the traditional p-mode regime (f > 15 day(-1)) are observed. (AU) | |
| 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: | 18/26380-8 - Modelagem de poeira em supergigantes vermelhas utilizando Inferência Bayesiana |
| Beneficiário: | Tajan Henrique de Amorim |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 17/23731-1 - Análise e Modelagem de uma Grande Amostra de Estrelas Be Galácticas |
| Beneficiário: | Jonathan Michael Labadie-Bartz |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 20/04445-0 - Contextualização dinâmica de uma amostra de Estrelas Be observadas pelo Tess usando análise espectroscópica |
| Beneficiário: | Pedro Ticiani dos Santos |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| 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 |