Long-Term Cyclic Variability of YZ CMi in the Context of Solar and Stellar Physics

Manifestations of the activity of the YZ CMi (M4.5Ve) flare star with a rotation period of 2.77 days, which is included in the group of activity-saturated stars, are considered based on long-term photometric data, including photographic measurements over the interval from 1926 to 2009. Long-term cha...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2018-12, Vol.58 (7), p.910-915
Main Authors: Bondar, N. I., Katsova, M. M.
Format: Article
Language:English
Subjects:
Dynamic characteristics
Earth and Environmental Science
Earth Sciences
Flare stars
Geophysics/Geodesy
Photometry
Star brightness
Stars
Stellar physics
Stellar rotation
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Summary:Manifestations of the activity of the YZ CMi (M4.5Ve) flare star with a rotation period of 2.77 days, which is included in the group of activity-saturated stars, are considered based on long-term photometric data, including photographic measurements over the interval from 1926 to 2009. Long-term changes in the yearly mean brightness of the star found on the time scale of 27.5 years with an amplitude of 0.2–0.3 m , that indicate on variations in the development of surface inhomogeneities and a large degree of spottedness in the maximum activity. The spots are distributed unevenly over the surface with an increased concentration at certain longitudes spaced by intervals equal to 0.6 phases of the rotation period. The recovery of the active longitude (a possible “fliр-flop” effect) occurs over a period of about 6 years. We note differences in activity of this star from typical for the Sun and solar-like stars, which are associated with its dynamic characteristics P cyc and P rot and its inner structure.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793218070046