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Satellite Galaxies' Drag on Field Stars in the Milky Way
Liu, Jifeng; Zhao, Jingkun; Liang, Xilong +1 more
With Gaia EDR3 data, velocity dispersion of Milky Way field stars around satellite galaxies has been investigated. We have fitted velocity dispersion against the distance to the satellite galaxy and found the gradient of velocity dispersion is related to the mass of the satellite galaxy. With order-of-magnitude approximations, a linear correlation…
Coronal Density Measurements Using Giant Radio Pulses of the Crab Pulsar at the Cycle 24/25 Minimum
Tokumaru, Munetoshi; Terasawa, Toshio; Takefuji, Kazuhiro +2 more
Accurate measurements of the coronal plasma density profile, which varies with the solar cycle (SC), are necessary to elucidate the solar wind acceleration. In this study, the Crab pulsar is observed using the 327 MHz radio telescope at the Toyokawa Observatory of the Institute for Space-Earth Environmental Research of Nagoya University to investi…
Multi-star System Observations Based on the Direct-imaging Method
Zhao, G.; Chen, Y. L.; Zhu, Y. T. +1 more
The direct-imaging exploration can obtain comprehensive physical information of exoplanets, which is a key technology to search for extraterrestrial life in the future. In this paper, based on our recent high-contrast imaging data of ground-based telescope, the newly discovered multi-star candidates are presented. In the early stage, combined with…
Highlights from ILEWG LUNEX EuroMoonMars Earth Space Innovation, ArtMoonMars, Space Renaissance & EuroSpaceHub
Foing, Bernard H.
EuroMoonMars is an ILEWG/LUNEX programme in collaboration with space agencies, academia, universities and research institutions and industries. The programme includes research activities for data analysis, instruments tests and development, field tests in MoonMars analogue, pilot projects, training and hands-on workshops, and outreach activities. …
The Precise Individual Masses and Theoretical Stability and Habitability of some Single-lined Spectroscopic Binaries
Abushattal, A. A.; Kraishan, A. F.; Algnamat, B. S. +1 more
Over the past few decades, some Spectroscopic Binaries (SBs) have been resolved using high-resolution techniques. Astrophysics is interested in this subject because we can obtain the mass of each component. By combining a visual solution with a complimentary one, such as the spectroscopic orbit or Edward method, we can determine the individual mas…
X-ray hot spots in the eastern ear of the supernova remnant W 50 and the microquasar SS 433 system
Katsuda, Satoru; Sato, Toshiki; Uchiyama, Hideki +10 more
We examined the X-ray and radio spatial structure at the eastern ear of the W 50/SS 433 system to clarify a characteristic feature of the termination region of the SS 433 jet, and found that a hot spot ahead of the filament structure, which is considered to be a terminal shock of the SS 433 eastern jet, is clearly different from a single point sou…
Photometric Study of the Open Cluster NGC 225
Carraro, G.; Ikonnikova, N. P.; Yalyalieva, L. N. +2 more
—NGC 225 is a young moderately populated cluster with discrepant age, distance, and color excess estimates reported by different authors. We combine our photometry with the data from large surveys (2MASS, WISE, Pan-STARRS) to derive the parameters of NGC 225 and study the extinction law in the near infrared in the direction of the cluster. We use …
Formation and Immediate Deformation of a Small Filament Through Intermittent Magnetic Interactions
Zhang, Liang; Chen, Yao; Zheng, Ruisheng +4 more
It is generally believed that filament formation involves a process of the accumulation of magnetic energy. However, in this article, we discuss the idea that filaments will not erupt and will only deform when the stored magnetic energy is released gradually. Combining high-quality observations from SolarDynamicsObservatory and other instruments, …
Charge-injection Device Imaging of Sirius with Contrast Ratios Greater than 1:26 Million
Sawant, Sailee M.; Batcheldor, Daniel
The intrinsic nature of many astronomical objects, such as binary and multiple systems, exoplanets, circumstellar and debris disks, and quasar host galaxies, introduces challenging requirements for observational instrumentation and techniques. In each case, we encounter situations where the light from bright sources hampers our ability to detect s…
Method of evaluation of the most probable mean radial velocities of open star clusters
Kovaleva, D. A.; Kalinkin, A. D.; Kondratev, N. E. +1 more
In this article the method of self-consistent estimate of star clusters' average radial velocity by kinematic parameters was proposed. The method is based on convergent point method of probable cluster members determination. By modelling the method validation was held and properties of received estimate depending on a number of cluster parameters …