IRAS 19135+3937: an SRd variable as interacting binary surrounded by a circumbinary disc
IRAS 19135+3937: an SRd variable as interacting binary surrounded by a circumbinary disc
Semi-regular (SR) variables are not a homogeneous class and their variability is often explained due to pulsations and/or binarity. This study focuses on IRAS 19135+3937, an SRd variable with an infrared excess indicative of a dusty disc. A time series of high-resolution spectra, UBV photometry as well as a very …