X-rays in Cepheids: XMM-Newton Observations of $\eta$ Aql

Nancy Remage Evans, Ignazio Pillitteri, Pierre Kervella +13

X-ray bursts have recently been discovered in the Cepheids $\delta$ Cep and $\beta$ Dor modulated by the pulsation cycle. We have obtained an observation of the Cepheid $\eta$ Aql with the XMM…