Results 11 to 20 of about 4,300 (180)
The Astronomical Journal, 2016 ABSTRACT By analyzing K2 short-cadence observations, we detect starspots on WASP-85A, the host star of the hot Jupiter WASP-85Ab. The detection of recurring starspot occultation events indicates that the planet’s orbit is aligned with the star’s rotational axis ( λ
T. Močnik +4 more
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Differential photometry of EK DRA and 29 DRA [PDF]
Serbian Astronomical Journal, 2005 We report on BVR precise photometry of active late-type stars EK DRA and 29 DRA in the spring of 2004. The analysis suggests a reasonable fit with single spot model for both cases in the season as far as the V-curve is concerned.
Zboril M.
doaj +1 more source
ON SUNSPOT AND STARSPOT LIFETIMES [PDF]
The Astrophysical Journal, 2014 We consider the lifetimes of spots on the Sun and other stars from the standpoint of magnetic diffusion. While normal magnetic diffusivity predicts lifetimes of sunspots that are too large by at least two orders of magnitude, turbulent magnetic diffusivity accounts for both the functional form of the solar empirical spot-lifetime relation and for the ...
S. J. Bradshaw, P. Hartigan
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3D Radiative MHD Simulations of Starspots [PDF]
The Astrophysical Journal, 2020 Abstract There are no direct spatially resolved observations of spots on stars other than the Sun, and starspot properties are inferred indirectly through lightcurves and spectropolarimetric data. We present the first self-consistent 3D radiative MHD computations of starspots on G2V, K0V, and M0V stars, which will help us to better ...
Mayukh Panja +2 more
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Detecting Differential Rotation and Starspot Evolution on the M dwarf GJ 1243 with Kepler [PDF]
, 2015 We present an analysis of the starspots on the active M4 dwarf GJ 1243, using four years of time series photometry from Kepler. A rapid $P = 0.592596\pm0.00021$ day rotation period is measured due to the $\sim$2.2\% starspot-induced flux modulations in ...
Davenport, James R. A. +2 more
core +3 more sources
The effect of starspots on the radii of low-mass pre-main sequence stars [PDF]
, 2014 A polytropic model is used to investigate the effects of dark photospheric spots on the evolution and radii of magnetically active, low-mass ...
Jackson, R. J., Jeffries, R. D.
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Under-Developed and Under-Utilized Eclipsing Binary Model Capabilities [PDF]
Journal of Astronomy and Space Sciences, 2012 Existing but largely unused binary star model capabilities are examined. An easily implemented scheme is parameterization of starspot growth and decay that can stimulate work on outer convection zones and their dynamos.
R. E. Wilson
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Statistical properties of superflares on solar-type stars based on 1-min cadence data [PDF]
, 2015 We searched for superflares on solar-type stars using Kepler data with 1 min sampling in order to detect superflares with short duration. We found 187 superflares on 23 solar-type stars whose bolometric energy ranges from the order of $10^{32}$ erg to ...
Honda, Satoshi +6 more
core +2 more sources
A New Approach to the Long-Term Activity Behavior of DM UMa
Open Astronomy, 2012 A long-term activity character of DM UMa (K0-1 IV-III), which is one of the most active members of the RS CVn type variables, is examined using the multicolor photometric observations which spread to the time interval between 1980 and 2009. In this work,
Taş G., Evren S.
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Light curve analysis of W-UMa type binary systems RZ UMi, OQ UMa, LP UMa [PDF]
Serbian Astronomical JournalThis study presents new, high-quality, optical photometric observations of three W-UMa type contact binaries. The analysis of the corresponding light curves is made using Djurašević's inverse problem method.
Grozdanović M., Đurašević G.
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