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Accretion disks in symbiotic stars
Luna, G. J. M.
The nature of accretion in symbiotic binaries, in which the red giant transfers material to a white dwarf (WD) companion, has been difficult to uncover. The accretion flows in a symbiotic binary are most clearly observable, however, when there is no quasi-steady shell burning on the WD to hide them. Through observations in the high energy regime, …
Search for Possibly Evolutionary Linked Globular and Open Clusters
Bobylev, V. V.; Bajkova, A. T.
Based on a large sample of 133 Galactic globular clusters we obtained a new estimate of the frequency of globular-cluster impacts onto the Galactic plane, which we found to be equal to three events per 1 Myr. Our computations involving new kinematical data do not support the well-known hypothesis about the possible origin of the open cluster Steph…
Investigation of a Confined C-Class Flare in an Arch Filament System Close to a Regular Sunspot
Louis, Rohan Eugene
A moderate C1.1 class confined flare is investigated here, which occurred on 24 September 2013 at 22:56 UT, in an arch filament system close to a regular, unipolar sunspot. Spectropolarimetric observations from the Tenerife Infrared Polarimeter at the 70-cm German Vacuum Tower Telescope were combined with data from the Helioseismic Magnetic Imager…
SEROB1A Association in DR2 GAIA Epoch
Chentsov, E. L.
In the light of new astrometric and available spectroscopic data, the structure and kinematics of the SerOB1A association are discussed and the issue of correcting its boundaries is put.
Large-scale altitude distribution profile of auroral parallel electric potentials: A statistical analysis of Cluster data
Sadeghi, Soheil; Emami, M. Reza
It is generally believed that the heart of the Auroral Acceleration Region (AAR) is located between 5000 and 8000 km altitude above the auroral oval. Various altitude distribution profiles are suggested by different theories, including the transition layer model, which predicts that the strongest electric fields can be found at about 1 RE
Galactic astronomy and small telescopes
Zwitter, T.
The second data release of ESA's Gaia satellite (Gaia DR2) revolutionised astronomy by providing accurate distances, proper motions, apparent magnitudes, and in many cases temperatures and radial velocities for an unprecedented number of stars. These new results, which are freely available, need to be considered in virtually any stellar research p…
Driving Gaia Science from the ESA Archive: DR2 to DR3
Mora, A.; Bakker, J.; de Teodoro, P. +11 more
Released 25th April, Gaia DR2 hosted in the ESA Gaia archive is leading a paradigm shift in the way astronomers access and process astronomical data in ESA archives.
An unprecedented active community of thousands of scientists is making use of the latest IVOA protocols and services (TAP, DataLink) in this archive, benefitting from remote exec…Impact of galactic interactions on the evolution of the far-infrared-radio correlation
Pavlović; , M.; Prodanović +1 more
A strong correlation has been known to exist between the far-infrared (FIR) and radio emission of star-forming galaxies. Observations have shown that, although scatter is present, this correlation holds over a range of redshifts and does not evolve. However, there have been a number of more recent observations, especially in higher redshift survey…
Effect of the Surface Roughness of Icy Grains on Molecular Oxygen Chemistry in Molecular Clouds
Gunell, H.; De Keyser, J.; Mousis, O. +6 more
Molecular cloud and protosolar nebula chemistry involves a strong interaction between the gas phase and the surface of icy grains. The exchanges between the gas phase and the solid phase depend not only on the adsorption and desorption rates but also on the geometry of the surface of the grains. Indeed, for sufficient levels of surface roughness, …
Reprocessing All the XMM-Newton Scientific Data: A Challenge for the Pipeline Processing System
Rodriguez-Pascual, Pedro; Perea-Calderón, José Vicente; Gabriel, Carlos
2019 will mark the 20-year anniversary of the XMM-Newton Mission. So far, the mission has successfully completed a total of around 14000 pointing observations, and it is expected to continue for many more years, producing a huge number of high-quality science data products.
Data processing of those observations is carried out by the XMM-Newto…