Publication details

Preliminary Study of the Moderately Cool Chemically Peculiar Star BS Circini

Authors

MIKULÁŠEK Zdeněk JANÍK Jan KRTIČKA Jiří ZEJDA Miloslav JAGELKA Miroslav

Year of publication 2015
Type Article in Proceedings
Conference Physics and Evolution of Magnetic and Related Stars
MU Faculty or unit

Faculty of Science

Citation
Field Astronomy and astrophysics
Keywords BS Cir; photometry; CP stars
Description BS Cir is a representative of moderately cool magnetic chemically peculiar stars, which shows very strong light variations in the Strömgren index c1, indicating large changes in the height of the Balmer jump. We present a two-spot model of the light variations, fitting successfully all the nine light curves obtained in the spectral region 335-750 nm. We also discuss the nature of the observed variations of the intensities of Fe, Cr, Ti, Si, Mg, and RE spectral lines and possible mechanisms matching the observed light variations. It was confirmed that the observed period of BS Cir 2.204d is rising with a rate of dP/dt = 5.4(4)×10-9. The found minor secular changes in the shape of the light curve should be compatible with the period changes caused by precessional motion due to magnetic distortion of the star.
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