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Fast Sausage Oscillations in Coronal Loops with Fine Structures
Guo, Mingzhe; Li, Bo; Shi, Mijie
Fast sausage modes (FSMs) in flare loops have long been invoked to account for rapid quasi-periodic pulsations (QPPs) with periods of order seconds in flare lightcurves. However, most theories of FSMs in solar coronal cylinders assume a perfectly axisymmetric equilibrium, an idealized configuration apparently far from reality. In particular, it re…
New candidates for AM Canum Venaticorum stars among ASAS-SN transients
Kato, Taichi; Kojiguchi, Naoto
We studied Zwicky Transient Facility (ZTF) light curves of 34 dwarf nova candidates discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) between 2020 May 12 and September 9 and found six AM CVn-type candidates. All objects showed short outbursts (post-superoutburst rebrightenings) on the fading tail. Two objects (ASASSN-20eq, ASASSN…
Interrelationships in the Gypsum–Syngenite–Görgeyite System and Their Possible Formation on Mars
Arana, Gorka; Madariaga, Juan Manuel; García-Florentino, Cristina +7 more
The Science of Fundamental Catalogs
Makarov, Valeri V.; Kopeikin, Sergei M.
This review paper discusses the science of astrometric catalogs, their current applications and future prospects for making progress in fundamental astronomy, astrophysics and gravitational physics. We discuss the concept of fundamental catalogs, their practical realizations, and future perspectives. Particular attention is paid to the astrophysic…
Measurability of the Nonlinear Response of Electron Distribution Function to Chorus Emissions in the Earth's Radiation Belt
Santolík, O.; Kolmašová, I.; Omura, Y. +1 more
We conduct test particle simulations to study the perturbations in a hot electron velocity distribution caused by a rising chorus element propagating parallel to the ambient magnetic field in the Earth's outer radiation belt. The wavefield is constructed from the nonlinear growth theory of chorus emissions of Omura (2021,
A revised view of the Canis Major stellar overdensity with DECam and Gaia: new evidence of a stellar warp of blue stars
Carballo-Bello, Julio A.; Vivas, A. Katherina; Martínez-Delgado, David +4 more
We present the Dark Energy Camera (DECam) imaging combined with Gaia Data Release 2 (DR2) data to study the Canis Major overdensity. The presence of the so-called Blue Plume stars in a low-pollution area of the colour-magnitude diagram allows us to derive the distance and proper motions of this stellar feature along the line of sight of its hypoth…
Variable Stars in Local Group Galaxies. VI. The Isolated Dwarfs VV 124 and KKr 25
Sarajedini, Ata; Martínez-Vázquez, C. E.; Vivas, A. Katherina +10 more
We present the discovery of variable stars in two isolated dwarf galaxies in the outskirts of the Local Group, VV 124 and KKr 25, using observations with the Hubble Space Telescope. VV 124 hosts stellar populations with a wide range of ages (>10 Gyr until the present) and therefore we find all types of classical pulsators. In VV 124, we detect …
X-ray and ultraviolet observations of the eclipsing cataclysmic variables OV Bootis and SDSS J103533.02+055158.3 with degenerate donors
Schwope, Axel; Traulsen, Iris; Worpel, Hauke
Context. The majority of cataclysmic variables are predicted to be post-period minimum systems with degenerate donor stars, the period bouncers. Owing to their intrinsic faintness, however, only a handful of these systems have so far been securely identified.
Aims: We want to study the X-ray properties of two eclipsing period bouncers, OV Boo…
Lynds Bright Nebulae: sites of possible twisted filaments and ongoing star formation
Dewangan, L. K.; Ojha, D. K.; Baug, T. +2 more
The paper presents an analysis of multiwavelength data of two Lynds Bright Nebulae (LBNs), LBN 140.07+01.64 and LBN 140.77-1.42. The 1420-MHz continuum map reveals an extended Y-shaped feature (linear extent ~3.7°), which consists of a linear part and a V-like structure. The sites LBN 140.07+01.64 and AFGL 437 are located towards the opposite side…
Occultation of a Large Star by the Large Plutino (28978) Ixion on 2020 October 13 UTC
Bosh, Amanda S.; Person, Michael J.; Levine, Stephen E. +3 more
We observed the occultation of the star Gaia DR2 4056440205544338944 by (28978) Ixion. The event was observed from two Lowell Observatory sites, using the 4.3 m Lowell Discovery Telescope (LDT), near Happy Jack, AZ, USA, and a 0.32 m telescope co-mounted with the Titan Monitoring telescope on Lowell's Mars Hill campus in Flagstaff, AZ. The LDT cho…