3.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Slovak Academy of SciencesSK377 papers
- Centre National de la Recherche ScientifiqueFR328 papers
- University of GroningenNL256 papers
- Instituto de Astrofísica de CanariasES218 papers
- Leiden UniversityNL201 papers
- University of AmsterdamNL199 papers
- Université Paris CitéFR193 papers
- National Institute for AstrophysicsIT192 papers
- Czech Academy of Sciences, Astronomical InstituteCZ181 papers
- Sorbonne UniversitéFR178 papers
- Max Planck Institute for AstronomyDE177 papers
- Goddard Space Flight CenterUS172 papers
24 papers · 2 filters
T Tauri stars in the SuperWASP and NSVS surveys
Ľubomír Hambálek, Martin Vaňko, Ernst Paunzen +1
We present a study of the long-term optical variability of young T Tauri stars using previously unpublished data from the SuperWASP project. Other publicly available photometry fro…
TYC 3637-1152-1 - a High Amplitude delta Scuti star with peculiar pulsational properties
Ernst Paunzen, Klaus Bernhard, Moriz Frauenberger +16
In some delta Scuti stars, only one or two radial modes are excited (usually the fundamental mode and/or first overtone mode) and the observed peak-to-peak amplitudes exceed 0.3 ma…
Properties of the inner penumbral boundary and temporal evolution of a decaying sunspot
M. Benko, S. J. González Manrique, H. Balthasar +3
It was empirically determined that the umbra-penumbra boundaries of stable sunspots are characterized by a constant value of the vertical magnetic field. We analyzed the evolution…
X-ray and UV emission of the ultrashort-period, low-mass eclipsing binary system BX Tri
V. Perdelwitz, S. Czesla, J. Robrade +2
Close binary systems provide an excellent tool to determine stellar parameters such as radii and masses with a high degree of precision. Due to the high rotational velocities, most…
The Kepler view of magnetic chemically peculiar stars
Stefan Hümmerich, Zdenek Mikulášek, Ernst Paunzen +6
Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of such diverse phenomena as atomic diffusion, magnetic fields, and stellar rotati…
Optical observations of "hot" novae returning to quiescence
P. Zemko, S. Ciroi, M. Orio +10
We have monitored the return to quiescence of novae previously observed in outburst as supersoft X-ray sources, with optical photometry of the intermediate polar (IP) V4743 Sgr and…
Statistical analysis of UV spectra of a quiescent prominence observed by IRIS
S. Jejčič, P. Schwartz, P. Heinzel +2
The paper analyzes the structure and dynamics of a quiescent prominence that occurred on October 22, 2013. We aim to determine the physical characteristics of the observed prominen…
Physical properties of beta Lyr A and its opaque accretion disk
D. Mourard, M. Broz, J. Nemravova +23
Mass exchange and mass loss in close binaries can significantly affect their evolution, but a complete self-consistent theory of these processes is still to be developed. Processes…
Search for Nearby Ultracool Compact Binaries in Gaia DR2
D. V. Denisenko, I. Larin
The information contained in the Gaia Second Data Release (DR2) allows to search for the unusual objects with the pre-selected properties, literally constructing the stars with the…
Temporal evolution of arch filaments as seen in He I 10830 Å
S. J. González Manrique, C. Kuckein, M. Collados +7
We study the evolution of an arch filament system (AFS) and of its individual arch filaments to learn about the processes occurring in them. We observed the AFS at the GREGOR solar…
Asynchronous polar V1500 Cyg: orbital, spin and beat periods
E. P. Pavlenko, P. A. Mason, A. A. Sosnovskij +7
The bright Nova Cygni 1975 is a rare nova on a magnetic white dwarf (WD). Later it was found to be an asynchronous polar, now called V1500 Cyg. Our multisite photometric campaign o…
Repeated transient jets from a warped disk in the symbiotic prototype Z And: A link to the long-lasting active phase
Augustin Skopal, Taya. N. Tarasova, Marek Wolf +2
Active phases of some symbiotic binaries survive for a long time from years to decades. The accretion process onto a white dwarf (WD) sustaining long-lasting activity, and sometime…
On the Nature of Long-Period Dwarf Novae with Rare and Low-Amplitude Outbursts
Mariko Kimura, Taichi Kato, Hiroyuki Maehara +35
There are several peculiar long-period dwarf-nova like objects, which show rare, low-amplitude outbursts with highly ionized emission lines. 1SWASP J162117441254, BD Pav, and V3…
Physical parameters and 0.2% parallax of the detached eclipsing binary V923 Scorpii
T. Pribulla, A. Mérand, P. Kervella +10
V923 Sco is a bright ( = 5.91), nearby ( = 15.460.40 mas) southern eclipsing binary. Because both components are slow rotators, the minimum masses of the components are…
Oscillations and Waves in Radio Source of Drifting Pulsation Structures
M. Karlicky, J. Rybak, M. Barta
Drifting pulsation structures (DPSs) are considered to be radio signatures of the plasmoids formed during magnetic reconnection in the impulsive phase of solar flares. In the prese…
Spectroscopic and photometric observations of Symbiotic Nova PU Vul during 2009-2016
A. A. Tatarnikova, M. A. Burlak, E. A. Kolotilov +5
A new set of low-resolution spectral and UBVJHKL-photometric observations of the symbiotic nova PU Vul is presented. The binary has been still evolving after the symbiotic nova out…
New variable Stars from the Photographic Archive: Semi-automated Discoveries, Attempts of Automatic Classification, and the New Field 104 Her
S. V. Antipin, I. Becker, A. A. Belinski +6
Using 172 plates taken with the 40-cm astrograph of the Sternberg Astronomical Institute (Lomonosov Moscow University) in 1976-1994 and digitized with the resolution of 2400 dpi, w…
Image Quality in High-resolution and High-cadence Solar Imaging
C. Denker, E. Dineva, H. Balthasar +4
Broad-band imaging and even imaging with a moderate bandpass (about 1 nm) provides a "photon-rich" environment, where frame selection ("lucky imaging") becomes a helpful tool in im…
An illumination effect and an eccentric orbit for the symbiotic binary PU Vul revealed by 32 years of optical spectroscopy
Virginia A. Cúneo, Scott J. Kenyon, Mercedes N. Gómez +3
We analyze 32 years of optical spectra and photometry for the symbiotic binary PU Vul. Light curves for the He I 4471, He II 4686 and H 4861 emission lines reveal…
The onset of low Prandtl number thermal convection in thin spherical shells
F. Garcia, F. R. N. Chambers, A. L. Watts
This study considers the onset of stress-free Boussinesq thermal convection in rotating spherical shells with aspect ratio ( and being the inner and oute…
Period variations of Algol-type eclipsing binaries AD And, TW Cas and IV Cas
S. Parimucha, P. Gajdos, V. Kudak +2
We present new analysis of O-C diagrams variations of three Algol-type eclipsing binary stars AD And, TW Cas and IV Cas. We have used all published minima times (including visual a…
High-resolution imaging and near-infrared spectroscopy of penumbral decay
M. Verma, C. Denker, H. Balthasar +9
Combining high-resolution spectropolarimetric and imaging data is key to understanding the decay process of sunspots as it allows us scrutinizing the velocity and magnetic fields o…
An excess of massive stars in the local 30 Doradus starburst
F. R. N. Schneider, H. Sana, C. J. Evans +29
The 30 Doradus star-forming region in the Large Magellanic Cloud is a nearby analogue of large star-formation events in the distant Universe. We determine the recent formation hist…
The First Post-Kepler Brightness Dips of KIC 8462852
Tabetha S. Boyajian, Roi Alonso, Alex Ammerman +203
We present a photometric detection of the first brightness dips of the unique variable star KIC 8462852 since the end of the Kepler space mission in 2013 May. Our regular photometr…