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Deep near-infrared survey towards the W40 and Serpens South region in the Aquila Rift: A comprehensive catalogue of young stellar objects
Wang, Hongchi; Gutermuth, Robert A.; Ma, Yuehui +5 more
Active star-forming regions are excellent laboratories for studying the origins and evolution of young stellar object (YSO) clustering. The W40-Serpens South region is such a region, and we compile a large near- and mid-infrared catalogue of point sources in it, based on deep near-infrared observations of Canada-France-Hawaii Telescope (CFHT) in c…
Sudden depletion of Alfvénic turbulence in the rarefaction region of corotating solar wind high-speed streams at 1 AU: Possible solar origin?
Pietropaolo, E.; Bruno, R.; Marino, R. +2 more
A canonical description of a corotating solar wind high-speed stream in terms of velocity profile would indicate three main regions: a stream interface or corotating interaction region characterized by a rapid increase in flow speed and by compressive phenomena that are due to dynamical interaction between the fast wind flow and the slower ambient…
High-latitude Observations of Inertial-range Turbulence by the Ulysses Spacecraft During the Solar Minimum of 1993-96
Isenberg, Philip A.; Schwadron, Nathan A.; Murphy, Neil +8 more
We have examined Ulysses magnetic field measurements for the years 1993 through 1996 as the spacecraft moved sunward from 5 au at high southern latitudes, passing through perihelion during the first fast-latitude scan to achieve high northern latitudes, and finally returning to 5 au. These years represent near-solar-minimum activity, providing a c…
Two-stream plasma instability as a potential mechanism for particle escape from the Venusian ionosphere
Ghosh, S.; Chandra, S.; Dey, S. +2 more
In this work we investigate the possibility of two-stream instability in the Venusian atmosphere to lead to momentum transfer to subsequent escape of Hydrogen and Oxygen ions from the ionosphere. We employ the hydrodynamic model and obtain the linear dispersion relation from which the two-stream instability is studied. Further the interaction of s…
Recent star formation history of the dwarf irregular galaxy Leo A
Stonkutė, Rima; Vansevičius, Vladas; Leščinskaitė, Alina
Context.
KMHK 1762: Another star cluster in the Large Magellanic Cloud age gap
Cignoni, M.; Tosi, M.; Ripepi, V. +11 more
Context. The star cluster (SC) age distribution of the Large Magellanic Cloud (LMC) exhibits a gap from ∼4 to 10 Gyr ago, with an almost total absence of SCs. Within this age gap, only two confirmed SCs have been identified hitherto. Nonetheless, the star field counterpart does not show the same characteristics, making the LMC a peculiar galaxy wh…
Analysis of eight magnetic chemically peculiar stars with rotational modulation
Paunzen, E.; Bowman, D. M.; Shultz, M. E. +9 more
Since the end of 2018, the Transiting Exoplanet Survey Satellite (TESS) has provided stellar photometry to the astronomical community. We have used TESS data to study rotational modulation in the light curves of a sample of chemically peculiar stars with measured large-scale magnetic fields (mCP stars). In general, mCP stars show inhomogeneous dis…
Distances to Local Group Galaxies via Population II, Stellar Distance Indicators. II. The Fornax Dwarf Spheroidal
Madore, Barry F.; Freedman, Wendy L.; Cerny, William +5 more
We determine three independent Population II distance moduli to the Fornax dwarf spheroidal (dSph) galaxy, using wide-field, ground-based VI imaging acquired with the Magellan-Baade telescope at Las Campanas Observatory. After subtracting foreground stars using Gaia EDR3 proper motions, we measure an I-band tip of the red giant branch (TRGB) magni…
Video observations of tiny near-Earth objects with Tomo-e Gozen
Kobayashi, Naoto; Takita, Satoshi; Usui, Fumihiko +20 more
We report the results of video observations of tiny (diameter less than 100 m) near-Earth objects (NEOs) with Tomo-e Gozen on the Kiso 105 cm Schmidt telescope. The rotational period of a tiny asteroid reflects its dynamical history and physical properties since smaller objects are sensitive to the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effe…
Exploring the Origin of Stealth Coronal Mass Ejections with Magnetofrictional Simulations
Yeates, A. R.; Bhowmik, P.; Rice, O. E. K.
Coronal mass ejections (CMEs) - among the most energetic events originating from the Sun - can cause significant and sudden disruption to the magnetic and particulate environment of the heliosphere. Thus, in the current era of space-based technologies, early warning that a CME has left the Sun is crucial. Some CMEs exhibit signatures at the solar …