2015A&A...576A..67A


Query : 2015A&A...576A..67A

2015A&A...576A..67A - Astronomy and Astrophysics, volume 576A, 67-67 (2015/4-1)

Signs of deep mixing in starspot variability.

ARKHYPOV O.V., KHODACHENKO M.L., GUEDEL M., JOHNSTONE C., LUEFTINGER T. and LAMMER H.

Abstract (from CDS):

The current knowledge on plasma mixing in stellar interiors is based on theoretical modeling, which calibrates the empirical relations between the mixing and observable stellar parameters. Hence, a model-independent method of studying the mixing process is a desirable, but yet unfounded approach. Here, using a new spectral-correlation method, verified for the Sun, we show that deep mixing is manifested in stellar photometric light curves. We measure the timescales of the stochastic change in the spectral power of rotational variability of hundreds of main-sequence stars from the Kepler mission archive. The discovered proportionality of these timescales to the turnover time of the standard mixing length theory, their consistency with Kolmogorov's theory of turbulence, and the relation with stellar activity provide a new approach to the probing of stellar interiors. This opens a broad perspective for experimental studies of deep mixing and magnetic dynamos in stars.

Abstract Copyright:

Journal keyword(s): stars: activity - starspots - stars: interiors

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 KIC 9019435 Ro* 19 23 37.8840838328 +45 18 06.108097374           ~ 10 0
2 KIC 11349386 Ro* 19 25 12.2781902136 +49 10 32.424236894           ~ 8 0
3 KIC 12066633 Ro* 19 36 26.4275346054 +50 32 21.164252830           ~ 5 0
4 KIC 7899309 Ro* 19 38 27.4054563014 +43 37 01.864131090           ~ 6 0
5 KIC 7294867 LP* 19 41 57.4942197780 +42 49 13.740568638     12.208   11.305 G2V 15 0

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2021.09.27-21:36:21

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