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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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