Search Publications
Spectral Types of Long-Period Double-Lined Eclipsing Binary System Components from Low-Resolution Spectroscopy Data
Berdnikov, L. N.; Kniazev, A. Yu.; Malkov, O. Yu. +5 more
We present the results of spectral observations and consequent analysis of six long-period double-lined eclipsing binaries (DLEBs) with main-sequence (MS) components from a sample formed with the aim of testing the ''mass–luminosity'' relation (MLR) for stars in the
Evolution of brightness and magnetic features of young solar-type stars - II. The young F8 star HIP 71933
Hébrard, E. M.; Hughes, J. E.; Marsden, S. C. +4 more
The early, active history of our Sun is still not fully understood. Observations of the magnetic fields on active young solar-type stars allow us an insight into the early evolution of our Sun. Here we present Doppler and Zeeman-Doppler images of the young late-F star HIP 71933 (HD 129181) at multiple epochs to add to the growing data about the ev…
X-Ray Spectroscopy of Interstellar Carbon: Evidence for Scattering by Carbon-bearing Material in the Spectrum of 1ES 1553+113
Paerels, Frits; Staunton, John
Molecules and particles make up ~40%-70% of carbon in the interstellar medium, yet the exact chemical structure of these constituents remains unknown. We present carbon K-shell absorption spectroscopy of the Galactic interstellar medium obtained with the Low Energy Transmission Grating Spectrometer on board the Chandra Observatory that directly ad…
Spectral Analysis of Mare Ingenii Basin (Lunar Farside)
Massironi, Matteo; Combe, Jean-Philippe; Tosi, Federico +8 more
Mare Ingenii is a site of great interest for lunar geology as it is one of the few basaltic plains on the farside of the Moon. It is located within the outer edge of the South Pole-Aitken basin, the largest and oldest impact basin in our Solar System. Mare Ingenii includes two large craters, Thomson and Thomson M, and a prominent swirl, a high-alb…
A deep Hα survey of the Carina tangent arm direction
Zavagno, A.; Elia, D.; Molinari, S. +3 more
Aims: The arm tangent direction provides a unique viewing geometry, with a long path in relatively narrow velocity ranges and lines of view that cross the arm perpendicular to its thickness. The spiral arm tangent regions are therefore the best directions for studying the interstellar medium within spiral density waves in the Milky Way, probi…
Statistical analysis of the probability of globular clusters interactions with each other and with the galactic centre according to Gaia DR2 data on the cosmological time scale
Ishchenko, M.; Sobolenko, M.; Berczik, P. +1 more
The main idea of the work is to study the dynamic evolution of the orbits of globular clusters (GCs) lookback in time obtained from the cosmological models that are closest to the potential of the Galaxy. This allows us to estimate the probability of close passages ("collisions") of the GC with each other and with the Galactic central in the Galax…
Stellar Proper Motion Study of Crowded Stellar Field of CSST
Tian, Hao; Zhang, Xin; Liu, Chao +7 more
The stellar absolute proper motion of crowded field is an important problem of astrometry. The space-based observation could get high spatially revolved images in the crowded field. The China Space Station Telescope (CSST) can provide high precision absolute proper motion that significantly improve the performance of HST and Gaia in the sky area a…
Apsidal motion in the α CrB binary system revealed through X-ray and optical eclipse timing
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +1 more
The α CrB system is among the brightest known eclipsing binaries in an eccentric orbit. In such systems, the periods between successive primary (Pprim) and secondary minima (Psec) typically differ, and the difference between the two periods provides information on apsidal motion in the system. However, with a binary period of…
Possible merger signatures of the bulges of non-dwarf galaxies in the core of the Coma Cluster
Hasan, S. N.; Poloji, Nagamani; Hasan, Priya
In this paper, we discuss a method to study virialised clusters of galaxies with no-interaction features, like tails and bridges, using diagnostics of bulge classification and their properties, namely Sérsic index (n) and the Kormendy relation. We study a sample of non-dwarf galaxies in the core of the Coma Cluster using HST/ACS data. We divided o…
Spectroscopic and Photometric Study of the Eclipsing Binary Star sigma Aquilae
Quadri, U.; Strabla, L.; Franco, L.
We report on spectroscopic and photometric observations of the eclipsing binary star sigma Aquilae (44 Aql). Archival TESS and Hipparcos data are used to confirm the orbital period of 1.95028 ± 0.00002 days, consistent with previous measurements. Doppler shifts of the He I line at 4922 Angstroms from high-resolution spectroscopic data were used to…