Banca de DEFESA: JOSAFARY PEREIRA DA SILVA CAMPELO
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.STUDENT : JOSAFARY PEREIRA DA SILVA CAMPELO
DATE: 15/12/2025
TIME: 13:30
LOCAL: Plataforma Google Meet
TITLE:
Analysis of Photometric Variability in B-type Stars Observed by the TESS Space Mission
KEY WORDS:
Stellar variability, B-type stars, TESS, photometry
PAGES: 108
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:
Massive stars are essential for the evolution and chemical enrichment of the universe; however, their structure and evolution remain poorly understood. This work presents a detailed analysis of photometric variability in B-type stars observed by the TESS space mission, in order to expand the number of stars with known rotation periods. The analysis covers 373 B-type stars, observed in 2-minute cadences by the TESS space mission. Three integrated temporal analysis techniques were employed: FFT and Lomb-Scargle periodograms, and wavelet transform, to characterize the variability signatures in the light curves. The classification revealed different types of variability, including 14 new B-type stars with rotational modulation in the TESS data, and 16 previously studied targets had their periods confirmed based on the literature. Among the remaining stars, pulsation signatures, binary systems, and candidates for hot subdwarfs were also identified. It was observed that a significant fraction of the sample exhibits noisy or ambiguous signals, possibly due to observational limitations or complex physical phenomena. The results obtained contribute to the understanding of stellar variability and highlight the importance of combining different analytical methods for identifying patterns in stellar photometry.
COMMITTEE MEMBERS:
Externo ao Programa - 1675216 - BRUNO LEONARDO CANTO MARTINS - nullExterno à Instituição - CARLOS EDUARDO FERREIRA LOPES - INPE
Externo à Instituição - DANIEL BRITO DE FREITAS - UFC
Interno - 3060853 - IZAN DE CASTRO LEÃO
Interno - 346785 - JOSE RENAN DE MEDEIROS