Banca de DEFESA: JOSE EDVALDO DE LIMA JUNIOR

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOSE EDVALDO DE LIMA JUNIOR
DATE: 19/12/2019
TIME: 14:00
LOCAL: Auditório do CCET
TITLE:

On the Incidence of Debris Disk orbiting in main Post Sequence Stars.

KEY WORDS:

White Dwarfs, Wise, 2MASS, Infrared, Warm Dust

PAGES: 106
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

In this work we look for debris discs around main post sequence using the infrared excess identified from the spectral energy distribution (SED) and visual inspection of the images provided by bands of the WISE satellite for each star. Our sample is compose of red giant and white dwarfs stars. The red giants sample have 6676 of Pinsonneault et al. (2018) catalog and 360 of Ceillier et al. (2018). In the catalog of  Fusillo et al. (2017) there are 12,359 stars that are inside (VST ATLAS) catalog, out of them these authors selected 4200 stars through Pwd function (probabilities of being white dwarfs). Out of the selected stars 351 of the stars are in the 2MASS (Cutri et al. 2003) catalog at the bands 1.24 mm, 1.63 mm and 2.16 mm  (J, H and K, respectively) and 220 stars have WISE (Cutri et al. 2013) fluxes at bands 3.4 mm, 4.6 mm, 12 mm and 22 mm (W1, W2, W3 and W4, respectively) where Only 41 of these stars have significance greater than   (Ribas et al. 2012) and 31 stars show excess infrared on the bands W1 and W2 according to their SEDs of the BT-DUSTY model. Finally, 7 of these stars were selected from the visual inspection for W1 and W2 bands. For the final sample of 7 stars, we calculate the disc temperature (), luminosity fraction (, inner radius () and mass of the disc ().

BANKING MEMBERS:
Presidente - 1675216 - BRUNO LEONARDO CANTO MARTINS
Interno - 3060853 - IZAN DE CASTRO LEÃO
Interno - 346785 - JOSE RENAN DE MEDEIROS
Externo à Instituição - LEONARDO ANDRADE DE ALMEIDA - UERN
Externo à Instituição - RODRIGO DA SILVA SOBRINHO - IFSP