Context. Photospheric vortex flows are thought to play a key role in the evolution of magnetic fields. Recent studies show that these swirling motions are...
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PublicationPersistent magnetic vortex flow at a supergranular vertex
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PublicationPG 1618+563B: A new bright pulsating sdB star
The results of two runs of time-series photometry made at the Nordic Optical Telescope clearly show that the sdB star PG 1618+563B is a new member of the EC...
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PublicationPG 1657+416: a new fast pulsating sdB star. Photometric observations and theoretical model comparison
Context: Since the discovery in 1997 of stellar oscillations in some B-type hot subdwarfs (sdBs), much effort is being made both observationally and...
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PublicationPhase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS
Context. Observations of the phase curves and secondary eclipses of extrasolar planets provide a window onto the composition and thermal structure of the...
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PublicationPhase diversity restoration of sunspot images. I. Relations between penumbral and photospheric features
We investigate the dynamics of and the relations between small-scale penumbral and photospheric features near the outer penumbral boundary: penumbral grains...
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PublicationPhase diversity restoration of sunspot images. II. Dynamics around a decaying sunspot
Two time series, taken simultaneously in the G-band and in white-light, and corrected for telescope aberrations and turbulence perturbations using the method of...
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PublicationPhase-resolved energy spectra of the Crab pulsar in the range of 50-400 GeV measured with the MAGIC telescopes
We use 73 h of stereoscopic data taken with the MAGIC telescopes to investigate the very high-energy (VHE) gamma-ray emission of the Crab pulsar. Our data show...
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PublicationPhase-resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during the 2008 outburst
Aims: We obtained phase-resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during its outburst in 2008 to find a signature of the...
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PublicationPhotometric and spectroscopic variability of the B5IIIe star HD 171219
We analyzed the star HD 171219, one of the relatively bright Be stars observed in the seismo field of the CoRoT satellite, in order to determine its physical...