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Optical Studies of Eight AM Herculis-type Cataclysmic Variable Stars
Thorstensen, John R.; Buckley, David A. H.; Woudt, Patrick A. +2 more
We report detailed follow-up observations of eight cataclysmic variable stars (CVs) that are apparently AM Her stars, also called polars. For all, we either determine orbital periods for the first time or improve on existing determinations. The seven for which we have spectra show the high-amplitude radial-velocity curves and prominent He II λ4686…
Spectral energy distribution modeling of broadband emission in the pulsar wind nebula 3C 58
An, Hongjun; Kim, Seungjong
We investigate the broadband emission properties of the pulsar wind nebula (PWN) 3C 58 using a spectral energy distribution (SED) model. We attempt to match simultaneously the broadband SED and spatial variations of X‑ray emission in the PWN. We further use the model to explain a possible far‑IR feature of which a hint was recently suggested in 3C…
Multipoint Observations of Magnetosheath Response to Foreshock Transients
Wei, Xinhua; Cai, Chunlin
Multispacecraft observations of the magnetosheath responses to various foreshock transients in a single event on 17 March 2004 are reported in this paper. The Cluster spacecraft recorded long-standing large amplitude ULF waves with both compressive and transverse components in the magnetosheath. Additionally, two transient structures with depressi…
An Observational Test of Solar Plasma Heating by Magnetic Flux Cancellation
Park, Sung-Hong
Recent observations suggest that magnetic flux cancellation may play a crucial role in heating the Sun's upper atmosphere (chromosphere, transition region, corona). Here, we intended to validate an analytic model for magnetic reconnection and consequent coronal heating, driven by a pair of converging and canceling magnetic flux sources of opposite…
A Radio Pinwheel Emanating from WR 147
Toalá, Jesús A.; Carrasco-González, Carlos; Rodríguez, Luis F. +2 more
Wolf-Rayet (WR) stars are evolved massive stars, presumably on their way to becoming supernovae. They are characterized by high luminosities and fast and dense stellar winds. We have detected signs of a radio continuum pinwheel associated with WR 147, a nitrogen-rich WR star with spectral subtype WN8. These structures are known to exist around a h…
E0102-VR: Exploring the scientific potential of Virtual Reality for observational astrophysics
Baracaglia, E.; Vogt, F. P. A.
Virtual Reality (VR) technology has been subject to a rapid democratization in recent years, driven in large by the entertainment industry, and epitomized by the emergence of consumer-grade, plug-and-play, room-scale VR devices. To explore the scientific potential of this technology for the field of observational astrophysics, we have created an e…
Exoplanets in the Antarctic Sky. III. Stellar Flares Found by AST3-II (CHESPA) within the Southern CVZ of TESS
Wittenmyer, Robert A.; Wang, Lifan; Yang, Ming +39 more
The CHinense Exoplanet Searching Program from Antarctica is a ground-based wide-field photometric survey using the AST3 and CSTAR telescopes located at Dome A, Antarctica. Blessed with the unparalleled observing conditions on the highest point of the Antarctic plateau, three remotely controlled, fully automatic telescopes (AST3-I, AST3-II, and CST…
Improved calibrations of the stellar occultation data accumulated by the SPICAV UV onboard Venus Express
Montmessin, Franck; Bertaux, Jean-Loup; Korablev, Oleg +2 more
Stellar occultation is a powerful method to study vertical structure of the Venus night mesosphere. The UV channel of SPICAV spectrometer, operated in 2006-2014 on board ESA's Venus Express orbiter, allowed retrieval profiles of atmospheric gases (CO2, SO2, and O3) and aerosols. It was also able to register differe…
Digitization of Astronegatives of the Pulkovo Glass Library: Positions of Saturn's Major Satellites in the Period 1972-1982 in the Gaia DR2 System
Izmailov, I. S.; Vasil'eva, T. A.; Khovrichev, M. Yu. +3 more
We present the results of the re-reduction of Pulkovo photographic plates with images of Saturn's major satellites in the Gaia DR2 catalog system (169 plates, 3007 individual positions). Astronegatives were taken with the 26-inch refractor at the Pulkovo Observatory between 1972 and 1982. The intrinsic accuracy of measurement of astronegatives usi…
Galaxy Cluster Mass Estimates in the Presence of Substructure
Mateo, Mario; Olszewski, Edward W.; Miller, Christopher J. +3 more
We develop and implement a model to analyze the internal kinematics of galaxy clusters that may contain subpopulations of galaxies that do not independently trace the cluster potential. The model allows for substructures within the cluster environment and disentangles cluster members from contaminating foreground and background galaxies. We estima…