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Data-driven Model of Temporal Evolution of Solar Mg II h and k Profiles over the Solar Cycle
Heinzel, Petr; Gunár, Stanislav; Koza, Július +2 more
The solar radiation in the cores of the Mg II h and k spectral lines plays a significant role in the illumination of prominences, coronal mass ejections (CMEs), spicules, flare loops, and surges. Moreover, the radiation in these lines strongly correlates with solar magnetic activity and the ultraviolet solar spectral irradiance affecting the photo…
Investigation of rocket effect in bright-rimmed clouds using Gaia EDR3
Ojha, D. K.; Maheswar, G.; Saha, Piyali +2 more
Bright-rimmed clouds (BRCs) are excellent laboratories to explore the radiation-driven implosion mode of star formation because they show evidence of triggered star formation. In our previous study, BRC 18 has been found to accelerate away from the direction of the ionizing H II region because of the well-known 'Rocket Effect'. Based on the assump…
J01020100-7122208: an accreted evolved blue straggler that was not ejected from a supermassive black hole
Hawkins, Keith; Jofré, Paula; Prieto, Jose L. +3 more
J01020100-7122208 is a star whose origin and nature still challenges us. It was first believed to be a yellow supergiant ejected from the Small Magellanic Cloud, but it was more recently claimed to be a red giant accelerated by the Milky Way's central black hole. In order to unveil its nature, we analysed photometric, astrometric, and high-resolut…
Tracing the Giant Outer Halo of the Mysterious Massive Disk Galaxy M104. I. Photometry of the Extended Globular Cluster Systems
Park, Byeong-Gon; Hwang, Narae; Lee, Myung Gyoon +4 more
M104 (NGC 4594, the Sombrero galaxy) is a mysterious massive early-type galaxy that shows a dominant bulge and a prominent disk. However, the presence of a halo in M104 has been elusive, and it is not yet known how M104 has acquired such a peculiar structure. Using wide (~2 deg2) and deep ugi images of M104 obtained with the CFHT/MegaCa…
An Imaging Search for Post-main-sequence Planets of Sirius B
Lucas, Miles; Ruane, Garreth; Bottom, Michael +1 more
We present deep imaging of Sirius B, the closest and brightest white dwarf, to constrain post-main-sequence planetary evolution in the Sirius system. We use Keck/NIRC2 in L' band (3.776 µm) across three epochs in 2020 using the technique of angular differential imaging. Our observations are speckle-limited out to 1 au and background-limited …
A Volumetric Study of Flux Transfer Events at the Dayside Magnetopause
Strugarek, Antoine; Vaidya, Bhargav; Paul, Arghyadeep
Localized magnetic reconnection at the dayside magnetopause leads to the production of Flux Transfer Events (FTEs). The magnetic fields within the FTEs exhibit complex helical flux-rope topologies. Leveraging the adaptive mesh refinement strategy, we perform a three-dimensional magnetohydrodynamic simulation of the magnetosphere of an Earth-like p…
Photometric and Spectroscopic Studies of the Long-Period Low-Mass-Ratio Deep-Contact Binary KN Per
Wang, Xi; Guo, Ya-Ni; Li, Kai +6 more
Photometric analysis and spectroscopic study of the long-period low-mass-ratio deep-contact binary KN Per were performed. The light curves of the BV(RI) c band were from the Ningbo Bureau of Education and Xinjiang Observatory Telescope at the Xingming Observatory. Through the analysis of the Wilson-Devinney program, KN Per was found as…
Astrometric Precision Tests on TESS Data
Lattanzi, M.; Busonero, D.; Bucciarelli, B. +5 more
Astrometry at or below the microarcsec level with an imaging telescope assumes that the uncertainty on the location of an unresolved source can be an arbitrarily small fraction of the detector pixel, given a sufficient photon budget. This paper investigates the geometric limiting precision, in terms of CCD pixel fraction, achieved by a large set o…
The Mysterious Radcliffe Wave
Bobylev, V. V.; Bajkova, A. T.; Mishurov, Yu. N.
This survey is devoted to the Radcliffe Wave discovered recently by Alves et al., from an analysis of the position of molecular clouds. These authors identified a narrow chain of molecular clouds, extended essentially in one line at an angle of about 30° to the galactic axis y. Essentially, the Radcliffe Wave outlines the damped oscillations in th…
Parameterization of long-period eclipsing binaries
Malkov, Oleg; Kniazev, Alexei; Berdnikov, Leonid +2 more
One of the important sources for independent determination of stellar masses is eclipsing binaries with components on the main sequence, and with observable spectral lines of both components. The parameters of such stars are used to construct the mass-luminosity relation for stars of high and intermediate masses. Among them, the type of long-perio…