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Fundamental parameters of barium and CH stars from asteroseismic analysis: HD 33409, HD 20084 and HD 66812
Goswami, Aruna; Sonamben, Mayani
Asteroseismic analysis of stars using space mission data, such as the transiting exoplanet survey satellite (TESS) allows us to derive accurate fundamental parameters of stars. Barium and CH stars are believed to be in binary systems with a now invisible white dwarf companion. Knowledge of accurate fundamental parameters of these stars is essentia…
Investigating star-formation activity towards the southern H II region RCW 42
Ojha, D. K.; Vig, S.; Ghosh, S. K. +4 more
The star-forming activity in the H II region RCW 42 is investigated using multiple wavebands, from near-infrared to radio wavelengths. Located at a distance of 5.8 kpc, this southern region has a bolometric luminosity of 1.8 × 106 L⊙. The ionized gas emission has been imaged at low radio frequencies of 610 and 1280 MHz using …
From hot to cold? - Hydrothermal activities as a source for icy-debris flows on Dryas Mons, Terra Sirenum, Mars
Hauber, E.; Martin, P.; Cardesín-Moinelo, A. +3 more
During an extensive grid-mapping campaign on Mars' southern hemisphere, we have detected so-called sheet flow deposits, which are defined by distinctive lobate fronts, thin and mostly planar layers, and faint sub-parallel surface lineations. They originate from the high plains of Dryas Mons, a large massif of impact and tectonic origin, and follow…
Poleward Moving Auroral Arcs and Pc5 Oscillations
Sato, N.; Tanaka, Y.; Ebihara, Y. +6 more
We present an example of one-to-one correspondence between poleward moving auroral arcs (PMAAs) and Pc5 oscillations observed at the Time History of Events and Macroscale Interactions during Substorms (THEMIS) Ground Based Observatory station Gillam. The PMAAs consisted of four successive intensifications (named PMAA1, PMAA2, PMAA3 and PMAA4) with…
Characterizing the bulk and turbulent gas motions in galaxy clusters
Pointecouteau, Etienne; Eckert, Dominique; Dupourqué, Simon +1 more
The most massive halos of matter in the Universe grow via accretion and merger events throughout cosmic times. These violent processes generate shocks at many scales and induce large-scale bulk and turbulent motions. These processes inject kinetic energy at large scales, which is transported to the viscous dissipation scales, contributing to the o…
Editor's note: A high-energy view of exoplanets and their environments
Schartel, Norbert
Multi-star System Observations Based on the Direct-imaging Method
Zhao, Gang; Chen, Yi-li; Zhu, Yong-tian +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…
A study of the Galactic HI supershell GS 121-05-037
Molina Lera, J. A.; Cichowolski, S.; Suad, L. A.
GS 121-05-037 is a Galactic supershell located in the outer part of the Galaxy at (l, b) ∼ (121.°3, - 4.°8) at a distance of 3.2 ± 1 kpc from the Sun. In this work we estimated the kinetic energy of the feature to determine its possible origin. Several catalogued H II regions are located projected towards the supershell. With the aim of determinin…
Gaia releases new Milky Way maps
Banks, Michael
The third data release from the European Space Agency's Gaia mission is one of the richest sets of published astronomical information, as Michael Banks finds out.
Human-Robotic Cooperative Space Exploration
Martin, Anne-Sophie
Since the beginning of space exploration, outer space has fascinated, captivated and intrigued people's mind. The launch of the first artificial satellite—Sputnik—in 1957 by the Soviet Union, and the first man on the Moon in 1969 represent two significant missions in the space exploration history. In 1972, Apollo 17 marked the last human program o…