Search Publications
Search for the Relationship between the Velocity of a Coronal Mass Ejection and the Decay Rate of the Magnetic Field in the Region of Mass Emission Generation
Fainshtein, V. G.; Rudenko, G. V.; Zagainova, Yu. S.
In this paper, we search for the relationship between the Vlin linear projection velocity and the Vss velocity in the 3D space of coronal mass ejections (CMEs) recorded by LASCO coronagraphs with an "n" decay rate of the transverse component of the Bt magnetic field above the polarity inversion line (PIL) of the ph…
Some notes concerning open clusters and GAIA DR2 data
Loktin, Alexander Vasilievich; Popova, Maria Erikovna
Issues in applying the Gaia DR2 data to determine the main parameters of open star clusters and the use of a formal, two color diagram for the initial selection of cluster members are discussed. The possibility of using the catalog estimates of interstellar absorption is considered. It has been shown that these estimates correlate with the E(B - V…
The Emission-Line Dusty Object IRAS 07080+0605, A Less-Evolved Example of the Red Rectangle
Miroshnichenko, A. S.; Manset, N.; Zharikov, S. V. +11 more
The all-sky survey conducted by the InfraRed Astronomical Satellite (IRAS) in the 1980's discovered many objects with infrared excesses whose nature has not been explored until recently. IRAS07080+0605 is one of those identified in the visual spectral range with an early-type star, which shows the B[e] phenomenon. The object is puzzling, because i…
High-resolution optical spectroscopy of Nova V392 Per
Stoyanov, K. A.; Georgiev, S.; Stateva, I. +1 more
Here we analyze high-resolution spectra of the Nova V392 Per obtained during the 2018 outburst. The Hα and Hβ emission lines show a triple-peak structure with radial velocities of about -2000 km/s, -250 km/s and 1900 km/s respectively. The near infrared spectrum is dominated by the narrow and single-peaked Paschen lines of hydrogen and the O I λ84…
Eye of a skull reveals details of cometary materials
Asphaug, Erik
The Philae spacecraft was meant to anchor itself to the surface of the comet 67P/Churyumov-Gerasimenko, but instead bounced into a hidden grotto. The telltale markings of its passage reveal details of the comet's fragile boulders.
Some kinematics of halo coronal mass ejections
Chandra, Ramesh; Verma, Virendra Kumar; Mittal, Nishant
We present an investigation of halo coronal mass ejections (HCMEs) kinematics and other facts about the HCMEs. The study of HCMEs is very important because HCMEs are regarded as the main causes of heliospheric and geomagnetic disturbances. In this study, we have investigated 313 HCMEs observed during 1996-2012 by LASCO, coronal holes, and solar fl…
On the Age of Galactic Bulge CSPNe: Too Young and Complicated?
Parker, Quentin A.; Lykou, Foteini; Zijlstra, Albert
We present preliminary results of our study of a small sample of planetary nebulae in the Galactic Bulge for which high-angular resolution Hubble Space Telescope imaging is available. From this and from archival spectroscopy, we were able to calculate temperatures and luminosities for their central stars. These were then correlated to up-to-date e…
Particle Induced X-ray Emission at Mercury and the Moon.
Grande, Manuel; Cooper, Rose
Mercury and the Moon are examples of terrestrial bodies which lack an atmosphere and therefore have surfaces which interact directly with the space environment. Thus the surfaces can be reprocessed by plasma impact, and in the process can emit X-rays via the Particle Induced X-ray Emission (PIXE) process. We will present and review existing measur…
HD 54361: evidence for the status of a low mass TP-AGB star
Schmidt, M.; Sperauskas, J.; Začs, L. +3 more
The mass of the cool carbon star HD 54361 was suspected to be high, assuming the membership in the stellar association CMa OB1, in conflict with the theory of stellar evolution. The Gaia parallax and a high-resolution spectrum in the wavelength region from about 4800 to 6900 Å was employed in order to update the distance, atmospheric parameters an…
New Virtual Moon Atlas freeware version 7
Legrand, Christian; Chevalley, Patrick
Introduction: Since 2002, we develop a freeware to help Moon observing, to improve interest for Moon in general public, and to provide a basic tool for aggregating informations on the Moon for professionals.Double windows with "Kaguya / LRO Shaded relief" and "Unified geologic 2020" textures Presentation : VMA uses datas coming from NASA, USGS, JP…