Detalhes bibliográficos
| Autor(a) principal: |
Romero, Alejandra Daniela |
| Data de Publicação: |
2020 |
| Outros Autores: |
Amaral, Larissa Antunes,
Kepler, Souza Oliveira,
Fraga, Luciano,
Kurtz, Donald W.,
Shibahashi, Hiromoto |
| Tipo de documento: |
Artigo
|
| Idioma: |
eng |
| Título da fonte: |
Repositório Institucional da UFRGS |
| Texto Completo: |
http://hdl.handle.net/10183/223015
|
Resumo: |
We report the detection of periodic variations on the Teff 32 000 K DA white dwarf star HE 1017−1352. We obtained time series photometry using the 4.1-m Southern Astrophysical Research telescope on three separate nights for a total of 16.8 h. From the frequency analysis, we found four periods of 605, 556, 508, and 869 s with significant amplitudes above the 1/1000 false alarm probability detection limit. The detected modes are compatible with low harmonic degree g-mode non-radial pulsations with radial order higher than ∼9. This detection confirms the pulsation nature of HE 1017−1352 and thus the existence of the new pulsating class of hot DA white dwarf stars. In addition, we detect a long period of 1.52 h, compatible with a rotation period of DA white dwarf stars. |