53 citations · 89 across the 6 of their papers we have counts for
8 papers · 1 filter
Stellar flares, superflares and coronal mass ejections -- entering the Big data era
Krisztián Vida, Zsolt Kővári, Martin Leitzinger +6
Flares, sometimes accompanied by coronal mass ejections (CMEs), are the result of sudden changes in the magnetic field of stars with high energy release through magnetic reconnecti…
Searching for stellar CMEs in the Praesepe and Pleiades clusters
K. Vida, B. Seli, R. M. Roettenbacher +4
On the Sun, the energetic, erupting phenomena of flares and coronal mass ejections (CMEs) often occur together. While space-based photometry has revealed frequent white-light flare…
EI Eridani: a star under the influence -- The effect of magnetic activity in the short and long term
L. Kriskovics, Zs. Kővári, B. Seli +5
We use our photometric time series of more than forty years to analyze the long-term behaviour of EI Eri. Flare activity is investigated using space-borne photometric data obtained…
Surface activity of the G dwarf primary in the quaternary star system V815 Her
Zsolt Kővári, Klaus G. Strassmeier, Tamás Borkovits +4
We investigate the magnetic activity of the G dwarf primary star in the multiple system V815 Herculis. Recently, TESS Sector 26 data have revealed that V815 Her is in fact a four-s…
Extending the FIP bias sample to magnetically active stars. Challenging the FIP bias paradigm?
B. Seli, K. Oláh, L. Kriskovics +6
The different elemental abundances of the photosphere and the corona are striking features of not only the Sun, but other stars as well. This phenomenon is known as the FIP effect…
Complex Rotational Modulation of Rapidly Rotating M-Stars Observed with TESS
Z. Zhan, M. N. Günther, S. Rappaport +23
We have searched for short periodicities in the light curves of stars with cooler than 4000 K made from 2-minute cadence data obtained in TESS sectors 1 and 2. Herein…
Doppler imaging of the double-lined active binary V824 Ara
Levente Kriskovics, Krisztián Vida, Zsolt Kővári +2
We introduce an iterative spectral disentangling technique combined with Doppler imaging in order to recover surface temperature maps for both components of double-lined active bin…
Modelling of an eclipsing RS CVn-binary: V405 And
K. Vida, K. Oláh, Zs. Kővári
V405 And is an ultrafast-rotating (P_rot ~ 0.46 days) eclipsing binary. The system consists of a primary star with radiative core and convective envelope, and a fully convective se…