Search Publications

Vertical distribution and kinematics of protoplanetary nebulae in the galaxy

Bobylev, V. V.; Bajkova, A. T.

The catalogue of protoplanetary nebulae by Vickers et al. has been supplemented with the line-of-sight velocities and proper motions of their central stars from the literature. Based on an exponential density distribution, we have estimated the vertical scale height from objects with an age less than 3 Gyr belonging to the Galactic thin disk (lumi…

Electron acceleration in the near-Earth magnetotail: test particle calculations in electromagnetic fields from two-dimensional hybrid simulations

Wu, Mingyu; Du, Aimin; Guo, Zhifang

Electron acceleration in the near-Earth magnetotail during the substorm period is still an unresolved question. In this paper, by tracing electron trajectories in the dynamically evolving electromagnetic fields obtained from a two-dimensional (2D) global hybrid simulation, we investigate electron acceleration in the near-Earth magnetotail during d…

The CO2 Cycle

Byrne, Shane; Michaels, Timothy I.; Forget, François +3 more

The Radio and X-ray Mode-Switching Pulsar PSR B0943+10

Mereghetti, Sandro; Rigoselli, Michela

Observations obtained in the last years challenged the widespread notion that rotation-powered neutron stars are steady X-ray emitters. Besides a few allegedly rotation-powered neutron stars that showed 'magnetar-like' variability, a particularly interesting case is that of PSR B0943+10. Recent observations have shown that this pulsar, well studie…

A Librational Model for the Propeller Blériot in the Saturnian Ring System

Seiß, M.; Spahn, F.; Hoffmann, H. +2 more

The reconstruction of the orbital evolution of the propeller structure Blériot orbiting in Saturn’s A ring from recurrent observations in Cassini ISS images yielded a considerable offset motion from the expected Keplerian orbit. This offset motion can be composed by three sinusoidal harmonics with amplitudes and periods of 1845, 152, 58 km and 11.…

Atomic diffusion in the atmosphere of Feige 86

Németh, Péter

We have revisited the ultraviolet and optical spectra of the blue horizontal branch star Feige 86. The new analysis finds the star cooler and more compact than previously determined. The IUE spectrum of Feige 86 holds numerous unidentified spectral lines of heavy metals, indicating efficient atomic diffusion in the atmosphere. Because diffusion pl…

Correlation of gas dynamics and dust in the evolved filament G82.65-02.00

Juvela, M.; Marshall, D. J.; Montier, L. +12 more

Context. The combination of line and continuum observations can provide vital insight into the formation and fragmentation of filaments and the initial conditions for star formation. We have carried out line observations to map the kinematics of an evolved, actively star forming filament G82.65-2.00. The filament was first identified from the Plan…

Catalog of positions and B magnitudes of stars of the part of Kitab northern sky survey (FON) project

Andruk, V. M.; Muminov, M. M.; Yuldoshev, Q. X. +3 more

The works of processing of Kitab's plates of FON project was completed. It was used 1963 plates. The catalogue of equatorial coordinates and B-magnitudes of 13 413 268 stars and galaxies up to B ≤ 17.5m for the epoch 1984.97 was compiled. The Epson Expression 10000XL scanner was used for digitization with the mode 1200 dpi, the size of plates are …

Spiky Structures around Reconnection Exhausts in the Solar Wind

Přech, Lubomír; Němeček, Zdeněk; Šafránková, Jana +1 more

The paper presents for the first time observations of unusual reconnection events in the solar wind. In all solar wind types, we identify magnetic reconnection exhausts accompanied by one or two side jets. This complex structure is created around a single current sheet and the jet(s) oriented in the same direction as the main exhaust is (are) spat…

An application of the KNND method for detecting nearby open clusters based on Gaia-DR1

Gao, Xin-Hua

This paper presents a preliminary test of the k-th nearest neighbor distance (KNND) method for detecting nearby open clusters based on Gaia-DR1. We select 38 386 nearby stars (< 100 {pc}) from the Gaia-DR1 catalog, and then use the KNND method to detect overdense regions in three-dimensional space. We find two overdense regions (the Hyades and …