Soydugan, FarukFrasca, A.Catalano, S.Ibano?lu, C.Demircan, O.Soydugan, Esin2025-01-272025-01-2720050379-6566https://hdl.handle.net/20.500.12428/1249013th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun -- 5 July 2004 through 9 July 2004 -- Hamburg -- 65457We present and discuss here new high-resolution (R? 22000) optical spectra of three Algol binaries, namely KO Aql, S Equ and AT Peg, obtained with the echelle spectrograph of Catania Astrophysical Observatory. In this work, we obtained new radial velocity curves for the hotter primary components with a much better precision than the previous data in the literature, mainly coming from old plate spectra. Thanks to the cross-correlation procedure, we were able to obtain, for the first time to our knowledge, radial velocities also for the cool secondary components of KO Aql and S Equ. We have also measured, with a rather good accuracy (2-4 km/s), the rotational velocity of the hotter components of these three systems and found that, with the exception of AT Peg, the primary stars are rotating faster than the synchronization velocity, consistently with a mass transfer scenario. In addition, preliminary results on the mass-transfer effects displayed by the H? and H? extra-absorption/emission components are presented.eninfo:eu-repo/semantics/closedAccessAlgol type binaries; Circumstellar matter; Stars: binaries; Stars: individual: KO Aql, S Equ and AT PegConference Object560 II9759782-s2.0-23844531327N/A