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Projeto Observacional para 2016B - SO2016B-017
Autor: Raimundo Lopes de Oliveira
Título: Optical follow-up of gamma-Cassiopeiae like candidate stars
Resumo: We request optical spectroscopy for 13 gamma Cassiopeiae (gCas) like candidate stars. They were initially identified in the XMM-Newton catalogue from their colours and subsequently confirmed by spectroscopy as being hard X-ray sources. Although the X-ray properties support that they are gCas-like stars, optical spectroscopy is absolutely needed to definitely proven the nature of those stars by virtue of their (low) optical luminosity. With this project we intend to populate the gCas class of stars allowing thus to better determine the range of parameter space in which the peculiar X-ray properties occur and put constraints on the causes of their X-ray emission.