Banca de DEFESA: FRANCYS ANTHONY DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : FRANCYS ANTHONY DA SILVA
DATA : 01/12/2017
HORA: 10:00
LOCAL: Auditório do DFTE
TÍTULO:

Rotation and Activity of F, G, and K type stars observed by CoRoT and KEPLER satellites

PALAVRAS-CHAVES:

Stars, Activity, Rotation, Light Curves, Time series

PÁGINAS: 110
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física Geral
RESUMO:

The question of how typical the Sun is within the class of solar-type stars,  in terms of activity and rotation has been the subject of active investigation over the past three decades. Recently, the CoRoT and Kepler space telescope observed  Thousand of stars (163 thousands for CoRoT and 400 thousand for Kepler) with an unprecedented richness and precision providing an opportunity to study the rotation and variability of solar-type stars (F, G and K) based on light curves . Light curves of those solar-type stars often show fluctuations due to rotational modulation by magnetic features (starspots and faculae) on stellar surfaces, and this is also dependent of the magnetic cycle period. In this Thesis, we are presenting rotation period measurements of a large sample of field stars in the solar neighbourhood, observed by CoRoT  and KEPLER satellites.  Rotation periods was measured from an unified technique  analysis composed by autocorrelation function, Lomb Scargle periodogram  and wavelet.  We also identified a sample of solar twins and analogs observed by the Kepler mission from which we determined their evolutionary status, rotation period and age from gyrochronology.  For the rotation activity we used a proxy based on the light curve modulation.  To interpret our results concerning the rotation measurements, based on solar physics, we compared the temporal variability of total solar irradiance (TSI) and the solar rotation period along a solar cycle. We used this interpretation with the variability of the CoRoT and Kepler light curves  to undertand  the connection of  the structures responsible for the intrinsic evolution and the light curve  modulation, as well as to determine the impact of the solar cycle on the measurements of the rotation period for F, G and K type stars.

MEMBROS DA BANCA:
Presidente - 2496004 - JOSE DIAS DO NASCIMENTO JUNIOR
Interno - 2887830 - MATTHIEU SEBASTIEN CASTRO
Externo à Instituição - FRÉDÉRIC BAUDIN - UPS
Externo à Instituição - MARCELO EMÍLIO - UEPG
Externo à Instituição - MARIA CRISTINA DE ASSIS RABELLO SOARES - UFMG