Detection of gravity modes in the massive binary V380 Cyg from Kepler spacebased photometry and high-resolution spectroscopy

摘要

We report the discovery of low-amplitude gravity-mode oscillations in themassive binary star V380 Cyg, from 180 d of Kepler custom-aperture spacephotometry and 5 months of high-resolution high signal-to-noise spectroscopy.The new data are of unprecedented quality and allowed to improve the orbitaland fundamental parameters for this binary. The orbital solution was subtractedfrom the photometric data and led to the detection of periodic intrinsicvariability with frequencies of which some are multiples of the orbitalfrequency and others are not. Spectral disentangling allowed the detection ofline-profile variability in the primary. With our discovery of intrinsicvariability interpreted as gravity mode oscillations, V380 Cyg becomes animportant laboratory for future seismic tuning of the near-core physics inmassive B-type stars.