| Full text | |
| Author(s): |
Labadie-Bartz, Jonathan
;
Carciofi, Alex C.
;
de Amorim, Tajan Henrique
;
Rubio, Amanda
;
Figueiredo, Andre Luiz
;
dos Santos, Pedro Ticiani
;
Thomson-Paressant, Keegan
Total Authors: 7
|
| Document type: | Journal article |
| Source: | ASTRONOMICAL JOURNAL; v. 163, n. 5, p. 36-pg., 2022-05-01. |
| Abstract | |
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) | |
| FAPESP's process: | 18/04055-8 - High precision spectroscopy: from the first stars to planets |
| Grantee: | Jorge Luis Melendez Moreno |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/26380-8 - Dust modeling in red supergiants Using Bayesian inference |
| Grantee: | Tajan Henrique de Amorim |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 17/23731-1 - Analysis and Modeling of a Large Sample of Galactic Be Stars |
| Grantee: | Jonathan Michael Labadie-Bartz |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 20/04445-0 - Dynamic contextualization of a be star sample observed by tess using spectroscopic analysis |
| Grantee: | Pedro Ticiani dos Santos |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 19/13354-1 - Decretion disks and outflows around fast-spinning stars |
| Grantee: | Alex Cavaliéri Carciofi |
| Support Opportunities: | Regular Research Grants |