Spectral Observations of the Eclipsing Binary RY Sct

Results of spectral observations of the eclipsing binary star RY Sct carried out in 2005 and 2009 with the 2.6 m telescope of V.A. Ambartsumian Byurakan Astrophysical Observatory are presented. While RY Sct needs a further detailed study, some important circumstances should be indicated insofar. Maximal values of equivalent widths are observed close to the primary minimum, whereas the minimal ones are detected at the brightness maximum, at which spectral lines have very narrow profiles. Emission line HeIλ6678A is seen during whole set of observations, but transformed into the weak absorption on almost half way from the secondary minimum to the maximum. Detection of P‐Cyg profile variations in some lines indicates to the variable character of the mass outflow from the star. The estimated mean velocities of the blue‐shifted absorptions correspond to ∼400km/s. The main observational characteristics of RY Sct are strongly related with the orbital period. To all probability, its observed peculiarities and very...