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Gas Dynamic Models of the Interaction between the Solar Wind and Cometary Atmospheres
Baranov, V. B.
Gas dynamic models of the interaction between the solar wind and cometary atmospheres are considered. Interest in the development of such models arose sharply after the beginning of the investigations of comets with the use of spacecraft launched at distances close to their surfaces. The instruments on this spacecraft gave the possibility to inves…
New light curve analysis and period changes of the HW Vir-type binary system V1828 Aql
Bulut, İ.; Nehir, Ç.
The new BVRI photometric observations of the HW Vir-type eclipsing binary system V1828 Aql (P = 0.11037399 days) were presented. From these measurements, 16 new eclipse times have been obtained. The light curves in BVRI colors and the radial curves were simultaneously analyzed by using the Wilson-Devinney method for the system parameters. The syst…
Eccentric orbits and apsidal motion in the eclipsing binaries EK Cep and HS Her
Gazeas, Kosmas; Latković, Olivera; Čeki, Atila +2 more
We present the first modern analysis of two young eclipsing binaries, EK Cep and HS Her, based on new ground-based CCD multicolour light curves and the Transiting Exoplanet Survey Satellite (TESS) observations, radial velocity curves, and eclipse timing measurements. The orbital and stellar parameters of the stars are determined by Roche modelling…
Spottedness Activity of the Young Star HIP 94235 from the Moving Group AB Doradus
Savanov, I. S.
Based on high-precision data from the archive of the TESS space mission, a study is made of the photometric variability of the brightness of HIP 94235, a bright star belonging to the 120 million years old moving group AB Doradus. We obtained an estimate for the rotation period of the star and the amplitude of the brightness variability, as well as…
Excitation and Excavation of the Claws of the Southern Crab
Frank, Adam; Balick, Bruce; Swegel, Ashley
We show that the Southern Crab (aka Hen2-104) presents an auspicious opportunity to study the form and speed of the invisible winds that excavate and shock the lobes of various types of bipolar nebulae associated with close and highly evolved binary stars. A deep three-color image overlay of Hen2-104 reveals that the ionization state of its lobe e…
First photometric study of two eclipsing binary star systems: V523 And and V543 And
Erdem, Ahmet; Öztürk, Oğuz
Detailed photometric analysis of V523 And and V543 And from the Wide Angle Search for Planets survey is presented for the first time. It was found that while V523 And is a detached binary, V543 And is a semi-detached binary star system. The adopted masses and radii for the primary and secondary components are M1 = 0 . 77 ± 0 . 08 M⊙, R<…
New approaches for faint source detection in hard X-ray surveys
Bird, A. J.; Lepingwell, V. A.; Gunn, S. R.
We demonstrate two new approaches that have been developed to aid the production of future hard X-ray catalogues, and specifically to reduce the reliance on human intervention during the detection of faint excesses in maps that also contain systematic noise. A convolutional neural network has been trained on data from the INTEGRAL/ISGRI telescope …
Application of the dynamic programming method to ensure of dual-channel attitude control of an asymmetric spacecraft in a rarefied atmosphere of Mars
Bakry, Ibrahim; Lyubimov, Vladislav Vasilyevich
We consider a linearized dynamic system, which determines the motion of the spacecraft relative to the center of mass in a rarefied atmosphere of Mars in the non-resonant case. This dynamic system takes into account the influence of disturbances from small aerodynamic and inertial asymmetry. The aim of this paper is to synthesis approximate optimi…
Solar-like oscillations and ellipsoidal variations in TESS observations of the binary 12 Boötis
Chaplin, William J.; Stassun, Keivan G.; Basu, Sarbani +14 more
Binary stars in which oscillations can be studied in either or both components can provide powerful constraints on our understanding of stellar physics. The bright binary 12 Boötis (12 Boo) is a particularly promising system because the primary is roughly 60 per cent brighter than the secondary despite being only a few per cent more massive. Both …
Connecting Solar Orbiter remote-sensing observations and Parker Solar Probe in situ measurements with a numerical MHD reconstruction of the Parker spiral
Telloni, Daniele; Susino, Roberto; Antonucci, Ester +21 more
As a key feature, NASA's Parker Solar Probe (PSP) and ESA-NASA's Solar Orbiter (SO) missions cooperate to trace solar wind and transients from their sources on the Sun to the inner interplanetary space. The goal of this work is to accurately reconstruct the interplanetary Parker spiral and the connection between coronal features observed remotely …