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Asteroseismology of two Kepler detached eclipsing binaries
Liakos, A.
The present work contains light curve, spectroscopic, and asteroseismic analyses for KIC 04851217 and KIC 10686876. These systems are detached eclipsing binaries hosting a pulsating component of δ Scuti type and have been observed with the unprecedented accuracy of the Kepler space telescope. Using ground-based spectroscopic observations, the spec…
The Three Young Nuclear Super Star Clusters in NGC 5253
Smith, Linda J.; Sabbi, Elena; Ryon, Jenna +1 more
The blue compact dwarf galaxy NGC 5253 hosts a very young central starburst. The center contains intense radio thermal emission from a massive ultracompact H II region (or supernebula) and two massive and very young super star clusters (SSCs), which are seen at optical and infrared wavelengths. The spatial correspondence between these three object…
Fast and Wide CMEs without Observed >20 MeV Protons
Thompson, B. J.; Lario, D.; Krupar, V. +6 more
Statistical studies have found a close association between large solar energetic particle (SEP) events and fast and wide coronal mass ejections (CMEs). However, not all fast and wide CMEs have an associated SEP event. From the Coordinated Data Analysis Web catalog of CMEs observed by the Solar and Heliospheric Observatory (SOHO) between 2009 Janua…
Two-dimensional model for the martian exosphere: Applications to hydrogen and deuterium Lyman α observations
Bertaux, J. L.; Clarke, J. T.; Yelle, R. V. +8 more
The analysis of Lyman α observations in the exosphere of Mars has become limited by the assumption of spherical symmetry in the modeling process, as the models are being used to analyze increasingly detailed measurements. In order to overcome this limitation, a two-dimensional density model is presented, which better emulates the density distribut…
Layered mound, inverted channels and polygonal fractures from the Makgadikgadi pan (Botswana): Possible analogues for Martian aqueous morphologies
Franchi, Fulvio; MacKay, Ruaraidh; Selepeng, Ame Thato +1 more
Layered mounds and inverted channels with polygonal fractures from the Ntwetwe Pan in the Makgadikgadi Basin (central Botswana) have been herein investigated. These morphologies are from an evaporitic basin (the Makgadikgadi Basin) that is the remnant of an ancient Pleistocene lake and is currently part of the world's largest evaporitic system.
Secular Extragalactic Parallax: Measurement Methods and Predictions for Gaia
Darling, Jeremy; Paine, Jennie; Graziani, Romain +1 more
Secular extragalactic parallax caused by the solar system's velocity relative to the cosmic microwave background rest frame may be observable as a dipole proper motion field with amplitude 78 µas yr-1 Mpc. Nearby galaxies also exhibit proper motions caused by their transverse peculiar velocities that prevent detection of secular p…
First stars that could significantly perturb comet motion are finally found
Dybczyński, Piotr A.; Królikowska, Małgorzata; Wysoczańska, Rita
Since 1950 when Oort published his paper on the structure of the cloud of comets it is believed that stars passing near this hypothetical cometary reservoir play an important role in the dynamical evolution of long-period comets and injecting them into the observability region of the Solar system. The aim of this paper is to discuss two cases in w…
Saturn atmospheric dynamics one year after Cassini: Long-lived features and time variations in the drift of the Hexagon
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +15 more
We examine Saturn's atmospheric dynamics with observations in the visible range from ground-based telescopes and Hubble Space Telescope (HST). We present a detailed analysis of observations acquired during 2018 obtaining drift rates of major meteorological systems from the equator to the north polar hexagon. A system of polar storms that appeared …
Photometric study of the young open clusters IC 1442, King 21, and Trumpler 7
Joshi, Y. C.; Maurya, Jayanand; Gour, A. S.
We carried out the UBVRcIc photometric study of three poorly studied young open clusters IC 1442, King 21, and Trumpler 7 (Tr 7). We obtained 263, 244, and 128 member stars using Gaia Data Release 2 proper motions and parallaxes in IC 1442, King 21, and Tr 7, respectively. The reddening, E(B - V), was derived to be 0.54 ± 0.0…
A precise benchmark for cluster scaling relations: Fundamental Plane, Mass Plane, and IMF in the Coma cluster from dynamical models
Krajnović, Davor; Kobayashi, Chiaki; Cappellari, Michele +4 more
We study a sample of 148 early-type galaxies in the Coma cluster using SDSS photometry and spectra, and calibrate our results using detailed dynamical models for a subset of these galaxies, to create a precise benchmark for dynamical scaling relations in high-density environments. For these galaxies, we successfully measured global galaxy properti…