Niemczura, EwaEwaNiemczuraPigulski, AndrzejAndrzejPigulskiKamińska, Monika K.Monika K.KamińskaKamiński, KrzysztofKrzysztofKamińskiLehmann, HolgerHolgerLehmannHełminiak, Krzysztof G.Krzysztof G.HełminiakCATANZARO, GiovanniGiovanniCATANZAROStateva, IvankaIvankaStatevaNapetova, MirelaMirelaNapetovaRóżański, TomaszTomaszRóżański2020-10-142020-10-142018978-83-950430-0-02545-1022http://hdl.handle.net/20.500.12386/27806We present the analysis of the variability of the SPB-type star 53 Per based on space photometry from BRITE-Constellation nano-satellites and SMEI-Coriolis experiment. The two photometries allowed us to detect 17 independent sinusoidal terms in the range 0.2 - 1.4 d^{-1} plus one combination, and one harmonic. The independent terms can be attributed to g modes excited in this star. Only three of these modes have been known earlier. In addition, we gathered almost 3500 new mid- and high-resolution spectra of 53 Per, which were used to calculate radial velocities. The frequency spectrum of the time-series radial-velocity data revealed four independent terms and one combination, all consistent with the frequencies detected in BRITE and SMEI photometry. The high-resolution and high signal-to-noise averaged spectrum was used to obtain atmospheric parameters of 53 Per, T_eff = 15600 ± 400 K and log (g/(cm s^{-2}))= 3.85 ± 0.10.ELETTRONICOenConference paperhttps://www.pta.edu.pl/proc/v7p162https://www.pta.edu.pl/proc/v7p12018pas7.conf..162NFIS/05 - ASTRONOMIA E ASTROFISICA