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Projeto Observacional para 2016A - SO2016A-006
Autor: Ingrid Pelisoli
Título: Photometry of Extremely-Low Mass White Dwarf Candidates
Resumo: Extremely-low mass white dwarfs have masses below the lower limit for single star evolution, therefore can only be explained as products of close binary evolution. They were first found as companions to pulsars, followed by companions to other white dwarfs and main sequence stars (The ELM Survey: Brown et al. 2010, Kilic et al. 2011, Brown et al 2011, Kilic et al. 2012, Brown et al. 2013, Gianninas et al. 2015) and finally as pulsators (Hermes et al. 2012, 2013a, b). Besides the g-modes common to other classes of white dwarf pulsators, it seems they also show p-mode pulsations. In the SDSS DR12 catalog, we found a few thousand stars with log g around 5.5, what means they are potentially ELM white dwarfs. To confirm this hypothesis, we will search for pulsations characteristic to this new class of object.