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A Uniform Series of Low-Latitude Coronal Holes in 1973-2018
Asikainen, T.; Mursula, K.; Hamada, A.
Coronal holes (CHs) are regions in the solar corona characterized by plasma density lower than in the surrounding quiet Sun. Therefore they appear dark in images of the solar atmosphere made, e.g., in extreme ultraviolet (EUV). Identifying CHs on solar images is difficult since CH boundaries are not sharp, but typically obscured by magnetic struct…
The study of runaway candidate stars in the 30 Doradus region: Using Gaia DR2 data
Gebrehiwot, Yikdem Mengesha; Teklehaimanot, Berhe Tewelde
We explore the Gaia DR2 relative proper motions of seven young, massive, OB type runaway candidate stars presented by Platais et al. (2018) in the 30 Doradus (30 Dor) region of the Large Magellanic Cloud (LMC). The stars are slow runaways in the tangential plane of the 30 Dor region with relative proper motions µ ≤ 0.4 mas yr-1 th…
Light-toned deposit in the northeastern Hellas basin formed by terrain-conforming airfall sedimentation
Wilson, S. A.; Howard, A. D.; Morgan, A. M. +2 more
Extensive exposures of a light-toned deposit (LTD) occurs on the northeastern interior slope of the Hellas basin. This deposit is on the floors of all but the youngest craters greater than 30 km in diameter in the study region centered at 83°E and 30°S, as well as in exposures on crater interior and exterior walls, on intercrater plains, and the n…
Study of central intensity ratio of early-type galaxies from low-density environment
Ravikumar, C. D.; Sruthi, K.
We present correlations involving central intensity ratio (CIR) of 52 early-type galaxies, including 24 ellipticals and 28 lenticulars, selected from low-density environment in the nearby (<30 Mpc) universe. CIR is found to be negatively and significantly correlated with the mass of the central supermassive black hole, central velocity dispersi…
MVN experiment - All sky monitor for measuring cosmic X-ray background of the universe onboard the ISS
Lutovinov, A. A.; Molkov, S. V.; Pavlinsky, M. N. +6 more
The article describes the MVN experiment (MVN - Monitor Vsego Neba in Russian transliteration) - All Sky Monitor onboard the ISS, which will start in 2021. The main scientific task of the experiment is to measure the cosmic X-ray background in energy range of 6 - 70 keV with unprecedented high absolute and spectral accuracy (about 1%). To reach th…
Interaction of Saturn's Hexagon With Convective Storms
Hueso, R.; Sánchez-Lavega, A.; Barry, T. +8 more
In March 2020, a convective storm erupted at planetographic latitude 76°N in the southern flank of Saturn's long lived hexagonal wave. The storm reached a zonal size of 4,500 km and developed a tail extending zonally 33,000 km. Two new short lived storms erupted in May in the hexagon edge. These storms formed after the convective storms that took …
Asteroseismology of SZ Lyn using multiband high time resolution photometry from ground and space
Ganesh, S.; Handler, G.; Joshi, Santosh +4 more
We report the analysis of high temporal resolution ground- and space-based photometric observations of SZ Lyncis, a binary star one of whose components is a high amplitude δ Scuti. UBVR photometric observations were obtained from Mt. Abu Infrared Observatory and Fairborn Observatory; archival observations from the WASP project were also included. …
Discovery of deep eclipses in the cataclysmic variable ZTF17aaaeefu (2MASS J00594349+6454419)
Kozhevnikov, V. P.
I performed photometric observations of the cataclysmic variable candidate ZTF17aaaeefu and discovered very deep eclipses. The observations were obtained over 8 nights covering 7 months. The eclipse profile is similar to the eclipse profiles observed in other cataclysmic variables. During the observations, ZTF17aaaeefu showed brightness changes re…
The Initial Mass Function of Low-mass Stars and Brown Dwarfs in the W3 Complex
Luhman, K. L.; Huston, M. J.
We have used archival infrared images obtained with the Wide Field Camera 3 on board the Hubble Space Telescope to constrain the initial mass function of low-mass stars and brown dwarfs in the W3 star-forming region. The images cover 438 arcmin2, which encompasses the entire complex, and were taken in the filters F110W, F139M, and F160W…
Spectroscopic and Photometric Study of the Mira Stars SU Camelopardalis and RY Cephei
Boyd, D.
Miras are fascinating stars. A kappa-mechanism in their atmosphere drives pulsations which produce changes in their photometric brightness, apparent spectral type, and effective temperature. These pulsations also drive the formation of Balmer emission lines in the spectrum. This behavior can be observed and investigated with small telescopes. We r…