A search for a spinning white dwarf companion in Gamma-Cas-analogs

The origin of the hard Xray spectrum emitted by GammaCas remains a puzzle.Both a white dwarf accreting from the Be star circumstellar disc or magneticinteraction between the photosphere and the disc can explain the unusually hardXray emission. The recent discovery of several new GCas analogs offers newopportunities to address this problem. XMMNewton observations of two GCasanalogs, HD161103 and HD119682 revealed evidences of periodic modulations of theXray flux apparently stronger than in GCas itself. We propose to reobservethese two sources in order to confirm or not the stability of the period.Establishing the presence of a stable pulsation in any of these GCas analogswould be a major step forward in our understanding of the whole class. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]