Search Publications
Young open cluster IC 4996 and its vicinity: multicolor photometry and Gaia DR2 astrometry
Munari, U.; Straižys, V.; Raudeliūnas, S. +9 more
The open cluster IC 4996 in Cygnus and its vicinity are investigated by applying a two-dimensional photometric classification of stars measured in the Vilnius seven-color photometric system. Cluster members are identified by applying distances based on the Gaia DR2 parallaxes and the point vector diagram of the Gaia DR2 proper motions. For some B-…
ODEA: Orbital Dynamics in a complex Evolving Architecture. Application to the planetary system HD 106906
De Rosa, R. J.; Lagrange, A. -M.; Beust, H. +3 more
Context. Mixed-variable symplectic integrators are widely used in orbital dynamics. However, they have been developed for Solar system-type architectures, and can not handle evolving hierarchy, in particular in systems with two or more stellar components. Such configuration may have occurred in the history of HD 106906, a tight pair of F-type star…
Updated orbital ephemeris of the ADC source X 1822-371: a stable orbital expansion over 40 years
Sanna, A.; Tailo, M.; Di Salvo, T. +6 more
Aims: Source
Compact gaseous accretion disk in Keplerian rotation around MWC 147
Monnier, John D.; Kraus, Stefan; Weigelt, Gerd +10 more
Context. The disks around some Herbig Be stars have been observed to be more compact than the expected dust sublimation radius for such objects. Highly refractory dust grains and optically thick gas emission have been proposed as possible explanations for this phenomenon.
Aims: Previously, the "undersized" Herbig Be star MWC 147 was observed …
Polarisation of a small-scale cometary plasma environment. Particle-in-cell modelling of comet 67P/Churyumov-Gerasimenko
Nilsson, Hans; Goetz, Charlotte; Gunell, Herbert +2 more
Context. The plasma near the nucleus of a comet is subjected to an electric field to which a few different sources contribute: the convective electric field of the solar wind, the ambipolar electric field due to higher electron than ion speeds, and a polarisation field arising from the vastly different ion and electron trajectories.
Aims: Our…
Properties of the transient X-ray pulsar Swift J1816.7-1613 and its optical companion
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Poutanen, Juri +4 more
We present results of investigation of the poorly studied X-ray pulsar
Quiescent X-ray variability in the neutron star Be/X-ray transient GRO J1750-27
Degenaar, N.; Wijnands, R.; Kaper, L. +5 more
The Be/X-ray transient GRO J1750-27 exhibited a type-II (giant) outburst in 2015. After the source transited to quiescence, we triggered our multi-year Chandra monitoring programme to study its quiescent behaviour. The programme was designed to follow the cooling of a potentially heated neutron-star crust due to accretion of matter during the prec…
AGILE, Fermi, Swift, and GASP/WEBT multi-wavelength observations of the high-redshift blazar 4C +71.07 in outburst
Lähteenmäki, A.; Longo, F.; Morselli, A. +56 more
Context. The flat-spectrum radio quasar 4C +71.07 is a high-redshift (z = 2.172), γ-loud blazar whose optical emission is dominated by thermal radiation from the accretion disc.
Aims: 4C +71.07 has been detected in outburst twice by the AGILE γ-ray satellite during the period from the end of October to mid-November 2015, when it reached a γ-r…
Spot evolution in the eclipsing binary CoRoT 105895502
Schmitt, J. H. M. M.; Czesla, S.; Wichmann, R. +1 more
Stellar activity is ubiquitous in late-type stars. The special geometry of eclipsing binary systems is particularly advantageous to study the stellar surfaces and activity. We present a detailed study of the 145 d CoRoT light curve of the short-period (2.17 d) eclipsing binary CoRoT 105895502. By means of light-curve modeling with Nightfall, we de…
Recovering saturated images for high dynamic kernel-phase analysis. Application to the determination of dynamical masses for the system Gl 494AB
Beuzit, J. -L.; Laugier, R.; Martinache, F. +3 more
Kernel-phase observables extracted from mid- to high-Strehl images are proving to be a powerful tool to probe within a few angular resolution elements of point sources. The attainable contrast is limited, however, by the dynamic range of the imaging sensors. The Fourier interpretation of images with pixels exposed beyond the saturation has so far …