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Kinematics of the Galaxy from Young Open Star Clusters with Data from the Gaia EDR3 Catalogue
Bobylev, V. V.; Bajkova, A. T.
We have analyzed the kinematics of open star clusters (OSCs) with the proper motions and distances calculated by Hao et al. based on Gaia EDR3 data. The mean line-of-sight velocities are known for a number of clusters from this list. We show that the Galactic rotation parameters determined from samples of OSCs with various ages are in good agreeme…
Astrobiological Potential of Fe/Mg Smectites with Special Emphasis on Jezero Crater, Mars 2020 Landing Site
Singh, Deepali; Sinha, Rishitosh K.; Singh, Priyadarshini +2 more
Life is known to adapt in accordance with its surrounding environment and sustainable resources available to it. Since harsh conditions would have precluded any possible aerobic evolution of life at the martian surface, it is plausible that martian life, should it exist, would have evolved in such a way as to derive energy from more optimum resour…
Sympathetic Quiet and Active Region Filament Eruptions
Joshi, Reetika; Chandra, Ramesh; Koleva, Kostadinka +3 more
We present the observations of three sympathetic filament eruptions occurring on 19 July 2015, namely F1, F2, and F3. The events were observed in UV and EUV by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory and by Global Oscillation Network Group telescope in Hα line. As filament F1
Characteristics of Nanoflare Heating in a Coronal Bright Point
Hahn, Michael; Savin, Daniel Wolf; Ho, Brandon
We have obtained constraints on the nanoflare energy distribution and timing for the heating of a coronal bright point. Observations of the bright point were made using the Extreme Ultraviolet Imaging Spectrometer on Hinode in slot mode, which collects a time series of monochromatic images of the region leading to unambiguous temperature diagnosti…
Calibration of NOMAD on ExoMars Trace Gas Orbiter: Part 3 - LNO validation and instrument stability
Vandaele, A. C.; Daerden, F.; Thomas, I. R. +7 more
The LNO channel is one of the 3 instruments of the NOMAD suite of spectrometers onboard the ExoMars Trace Gas Orbiter currently orbiting Mars. Designed to operate primarily at nadir at very high spectral resolution in the 2.3 µm-3.8 µm spectral region, the instrument observes the martian atmosphere and surface daily since March 2018. T…
Petrological and Mineralogical Characteristics of Exposed Materials on the Floors of the Lavoisier and Surrounding Craters
Moon, Seulgi; Yi, Eung Seok; Kim, Kyeong Ja +3 more
Five floor-fractured craters (FFCs), Lavoisier crater and four craters surrounding it (Lavoisier C, Lavoisier E, Lavoisier F, and Lavoisier H), are distributed along the boundary between the northwestern part of the Oceanus Procellarum and the highlands. This study examines the uplifted or exposed materials on the fractured floors of these five im…
A Low-speed Intruder Star in Hyades: A Temporary Residence
Hu, Qingshun; Zhang, Yu; Esamdin, Ali +4 more
We hereby report a low-speed (about 21 km s-1 with respect to the Sun) intruder member in the Hyades cluster based on the data in the literature. The results show that the star is a nonnative member star for Hyades, with its radial velocity being smaller than the radial velocity of the Hyades cluster, even exceeding the standard deviati…
Search for exoplanets around northern circumpolar stars. V. Three likely planetary companions to the giant stars HD 19615, HD 150010, and HD 174205
Jeong, G.; Lee, B. -C.; Park, M. -G. +2 more
Aims: We report the detection of long-period radial velocity (RV) variations in three giant stars, HD 19615, HD 150010, and HD 174205, using precise RV measurements.
Methods: These detections are part of the Search for Exoplanets around Northern Circumpolar Stars (SENS) survey being conducted at the Bohyunsan Optical Astronomy Observator…
Planet interactions at a young age
Petralia, Antonino; Micela, Giuseppina; Cecchi-Pestellini, Cesare +2 more
XMM-Newton study of the Sculptor dwarf spheroidal galaxy
Sasaki, Manami; Saeedi, Sara
We analysed observations with XMM-Newton in the field of the Sculptor dwarf spheroidal galaxy (dSph). The aim of the study was the classification of X-ray binaries and accreting white dwarfs belonging to the Sculptor dSph. Using different methods of X-ray timing and spectral analyses, together with an extensive multiwavelength study of the optical…