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Paper: Rotational Modulation in A–M stars
Volume: 518, Physics of Magnetic Stars
Page: 199
Authors: Savanov, I. S.; Dmitrienko, E. S.
Abstract: Recently, new observational techniques led to significant progress in the study of stellar rotation. Data from the space missions provided continuous extra-precise photometry for a large sample of stars. For stars with the rotational light variability, new observational data allow to investigate the relations between the rotational periods of objects and the amplitude of periodic brightness variability Rvar which can be considered as an indicator of stellar activity. We found that bimodal distribution of Rvar is evident for stars with Prot less than 10–20 days. Previous rotation periods were derived only for the main sequence stars with Teff below 6500 K. Here we estimated brightness variability for stars with Teff from 6500 K to 8000 K using data for 5865 objects from Kepler archive. Additionally we used the data for stars with temperatures more than 8500 K—a total of 312 stars, 247—ROT, and 65—ROTD types. Since multi-modality on Rvar–Prot diagram supposed to indicate possible existence of different surface magnetic field configurations in young and middle-age low-mass stars, we suggest that in the case of ROT and ROTD stars we might find manifestation of magnetism of another origin (e.g. dynamo action in radiative envelopes which involves differential rotation).
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