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Polarimetric Study of the Solar Corona During the Total Solar Eclipse on July 2, 2019 with a Liquid-Crystal Polarimeter
Fineschi, Silvano; Liberatore, Alessandro; Capobianco, Gerardo +5 more
The results obtained during the total Solar Eclipse on July 2, 2019, in Chile are presented together with the Eclipse K-corona Polarimeter (EKPol). The EKPol is equipped with an electro-optically modulating Liquid-Crystal Variable Retarder (LCVR) for the polarimetric observation of the solar corona. The use of this technology has been an important…
Evidence of Widespread Volcanic Activity near Hebrus Valles on Mars Revealed by SHARAD
Hamilton, Christopher W.; Holt, John W.; Nerozzi, Stefano +1 more
Hebrus Valles is an outflow channel system in the plain-forming terrains of southeastern Utopia Planitia, Mars. These terrains may have formed through a combination of liquid water and volcanic processes, yet their nature, subsurface structure, and composition remain unclear. We investigate these terrains by mapping subsurface reflectors across 54…
The Kinematics of the Young Stellar Population in the W5 Region of the Cassiopeia OB6 Association: Implication for the Formation Process of Stellar Associations
Lim, Beomdu; Yun, Hyeong-Sik; Park, Byeong-Gon +3 more
The star-forming region W5 is a major part of the Cassiopeia OB6 association. Its internal structure and kinematics may provide hints of the star formation process in this region. Here, we present a kinematic study of young stars in W5 using the Gaia data and our radial velocity data. A total 490 out of 2000 young stars are confirmed as members. T…
XMM-Newton and Chandra Observations of the Candidate Fermi-LAT Pulsar 4FGL J1015.5-6030
Pavlov, George G.; Kargaltsev, Oleg; Younes, George +2 more
4FGL J1015.5-6030 is an unidentified Fermi-LAT source hosting a bright, extended X-ray source whose X-ray spectrum is consistent with that of a young pulsar, yet no pulsations have been found. Here we report on XMM-Newton timing and Chandra imaging observations of the X-ray counterpart of 4FGL J1015.5-6030. We find no significant periodicity from …
Miras as a distance indicator in the CSST, JWST, and Gaia era
Sun, Yan; Zhang, Bo; Chen, Wen +5 more
Mira variables are important distance indicators owing to the clear period–luminosity relation at infrared wavelengths. We have compiled a sample of 343 Galactic Miras selected from the American Association of Variable Star Observers database and Gaia Data Release 3. We used V-band observations from the American Association of Variable Star Observ…
Multiple Populations in Low-mass Globular Clusters: Eridanus
Li, Chengyuan; Baumgardt, Holger; Geisler, Doug +5 more
Multiple populations (MPs), characterized by variations in light elemental abundances, have been found in stellar clusters in the Milky Way, Magellanic Clouds, as well as several other dwarf galaxies. Based on a large number of observations, mass has been suggested to be a key parameter affecting the presence and appearance of MPs in stellar clust…
Multiwavelength Analysis of a Nearby Heavily Obscured AGN in NGC 449
Fang, Guanwen; Gu, Qiusheng; Xu, Jun +5 more
We present the multiwavelength analysis of a heavily obscured active galactic nucleus (AGN) in NGC 449. We first constructed a broadband X-ray spectrum using the latest NuSTAR and XMM-Newton data. Its column density (≃1024 cm-2) and photon index (Γ ≃ 2.4) were reliably obtained by analyzing the broadband X-ray spectrum. Howev…
A novel "spectral‑ratio model fitting" to resolve complicated X‑ray spectral variations in active galactic nuclei
Ebisawa, Ken; Mizumoto, Misaki; Midooka, Takuya
Radiation‑magnetohydrodynamic simulation of the active galactic nuclei predicts the presence of the strong accretion disk wind, which gets unstable far from the central region and turns into gas clumps. These inner wind and outer clumps may be actually observed as the ultrafast outflows (UFOs) and the clumpy absorbers, respectively. We call this p…
Revealing the Binarity of HD 36030—One of the Hottest Flare Stars
Karpov, Sergey; Németh, Péter; Maryeva, Olga
The Kepler and TESS space missions significantly expanded our knowledge of what types of stars display flaring activity by recording a vast amount of super-flares from solar-like stars, as well as detecting flares from hotter stars of A-F spectral types. Currently, we know that flaring occurs in the stars as hot as B-type ones. However, the struct…
Asteroid landing analysis for multi-node probe based on spring damping device
Wang, Bang; Xu, Rui; Li, Zhaoyu +3 more
Soft landing on the surface of an asteroid is a prerequisite for performing surface exploration. Due to the weakness of gravitational field, complex surface, and unknown soil properties of asteroids, a single probe may rebound from the surface with uncontrollable long-range tumbling during landing, leading to a deviation from its original landing …