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Starspot Imaging Using VRI Photometry [PDF]
Symposium - International Astronomical Union, 1986 Recent progress on maximum-entropy imaging of stellar surface brightness distributions using VRI photometry and Doppler-broadened absorption line profiles is reported. VRI photometry generally provides tighter constraints on starspot configurations than does Doppler imaging (which requires the use of large telescopes).
openaire +1 more source
Asteroseismic Signature of a Large Active Region
Frontiers in Astronomy and Space Sciences, 2019 Axisymmetric magnetic activity on the Sun and sun-like stars increases the frequencies of the modes of acoustic oscillation. However, it is unclear how a corotating patch of activity affects the oscillations, since such a perturbation is unsteady in the ...
Emanuele Papini +2 more
doaj +1 more source
Measuring the Temperature of Starspots from Multi-filter Photometry
The Astronomical Journal, 2023 Using simultaneous multi-filter observations during the transit of an exoplanet around a K dwarf star, we determine the temperature of a starspot through modeling the radius and position with wavelength-dependent spot contrasts.
Maria C. Schutte +7 more
doaj +1 more source
Multiple views of magnetism in cool stars [PDF]
, 2012 Magnetic fields are regarded as a crucial element for our understanding of stellar physics. They can be studied with a variety of methods which provide complementary - and sometimes contradictory - information about the structure, strength and dynamics ...
Arzoumanian +24 more
core +3 more sources
The STELLA Robotic Observatory on Tenerife
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 The Astrophysical Institute Potsdam (AIP) and the Instituto de Astrofísica de Canarias (IAC) inaugurated the robotic telescopes STELLA‐I and STELLA‐II (STELLar Activity) on Tenerife on May 18, 2006. The observatory is located on the Izaña ridge at an elevation of 2400 m near the German Vacuum Tower Telescope.
Klaus G. Strassmeier +12 more
wiley +1 more source
Planet transit and stellar granulation detection with interferometry [PDF]
, 2014 Aims. We used realistic three-dimensional (3D) radiative hydrodynamical (RHD) simulations from the Stagger-grid and synthetic images computed with the radiative transfer code Optim3D to provide interferometric observables to extract the signature of ...
Asplund, Martin +5 more
core +1 more source
Mapping Stellar Surfaces. II. An Interpretable Gaussian Process Model for Light Curves
The Astronomical Journal, 2021 The use of Gaussian processes (GPs) as models for astronomical time series data sets has recently become almost ubiquitous, given their ease of use and flexibility.
Rodrigo Luger +2 more
doaj +1 more source
Differential rotation in K, G, F and A stars [PDF]
, 2016 Rotational light modulation in Kepler photometry of K - A stars is used to estimate the absolute rotational shear. The rotation frequency spread in 2562 carefully selected stars with known rotation periods is measured using time-frequency diagrams.
Abedigamba, Oyirwoth P., Balona, Luis A.
core +3 more sources
The Astrophysical Journal, 2023 Measuring the coverage of dark spots on cool stars is important to understanding how stellar magnetic activity scales with the rotation rate and convection zone depth. In this respect, it is crucial to infer surface magnetic patterns on G and K stars, to
Engin Bahar +6 more
doaj +1 more source
Is it possible to detect planets around young active G and K dwarfs? [PDF]
, 2013 Theoretical predictions suggest that the distribution of planets in very young stars could be very different to that typically observed in Gyr old systems that are the current focus of radial velocity surveys.
A. Reiners +61 more
core +4 more sources