New photometric and spectroscopic observations of 53 Per

Ewa Niemczura, Andrzej Pigulski, Monika K. Kamińska, Krzysztof Kamiński, Holger Lehmann, Krzysztof G. Hełminiak, Giovanni Catanzaro, Ivanka Stateva, Mirela Napetova, Tomasz Różański and the BRITE Team

We 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 signalto-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.

Proceedings of the Polish Astronomical Society, vol. 7, 162-167 (2018)

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