Three O-type supergiants observed by TESS show low-frequency periodicities and near-constant frequency spacings, which the authors interpret as rotationally split gravity modes and possible Rossby waves.
Is the bowshock of the runaway massive star HD 195592 a Fermi source?
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abstract
HD 195592 is an O-type super-giant star, known as a well-established runaway. Recently, a Fermi gamma-ray source (2FGL J2030.7+4417) with a position compatible with that of HD 195592 has been reported. Our goal is to explore the scenario where HD 195592 is the counterpart of the Fermi gamma-ray source modeling the non-thermal emission produced in the bowshock of the runaway star. We calculate the spectral energy distribution of the radiation produced in the bowshock of HD 195592 and we compare it with Fermi observations of 2FGL J2030.7+4417. We present relativistic particle losses and the resulting radiation of the bowshock of HD 195592 and show that the latter is compatible with the detected gamma-ray emission. We conclude that the Fermi source 2FGL J2030.7+4417 might be produced, under some energetic assumptions, by inverse Compton up-scattering of photons from the heated dust in the bowshock of the runaway star. HD 195592 might therefore be the very first object detected belonging to the category of gamma-ray emitting runaway massive stars, whose existence has been recently predicted.
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Gravity modes and potential evidence for Rossby Waves in late O-type supergiants
Three O-type supergiants observed by TESS show low-frequency periodicities and near-constant frequency spacings, which the authors interpret as rotationally split gravity modes and possible Rossby waves.