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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…
Physical conditions and redshift evolution of optically thin C III>absorbers: low-z sample
Pradhan, Ananta C.; Mohapatra, Abhisek; Srianand, R.
We present a detailed analysis of 99 optically thin C III absorption systems at redshift 0.2 ≤ z ≤ 0.9 associated with neutral hydrogen column densities in the range 15 ≤ log $N({\rm{H\,{\small I}}})$ (cm-2) ≤ 16.2. Using photoionization models, we infer the number density (nH), C-abundance ([C/H]), and line-of-sight thicknes…
Astrometry and photometry of digitized plates of Baldone Schmidt telescope
Eglitis, Ilgmars; Andruk, Vitaly
During the 40-year photographic period of astronomical observations, the Baldone Astrophysical Observatory has accumulated more than 22,000 direct and 2,500 spectral images. In 2018, the digitization of direct astrophoto images with a resolution of 1200 dpi was completed. A processing methodology for obtaining the equatorial coordinates and photom…
Synthetic topography from the decameter to the centimeter scale on Mars for scientific and rover operations of the ESA-Roscosmos ExoMars mission
Wöhler, C.; Ruesch, O.; Josset, J. -L. +7 more
The ESA-Roscosmos ExoMars platform and rover mission will have complex interactions with the martian surface. In order to plan and perform landing, roving and scientific operations, the morphological characteristics of the terrain surrounding the rover need to be characterized from the decameter to the centimeter spatial scale. The smallest possib…
The Host Galaxy of the Dwarf Seyfert UGC 06728
Bentz, Misty C.
We present multi-color high-resolution imaging of the host galaxy of the dwarf Seyfert UGC 06728. As the lowest-mass black hole to be described with both a direct mass constraint and a spin constraint, UGC 06728 is an important source for comparison with black hole evolutionary models, yet little is known about the host galaxy. Using Hubble Space …