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Spectral Behavior and Flaring Activity of II Peg in the Ultraviolet
Sanad, M. R.
We have studied the spectral behavior of the II Peg binary system in the ultraviolet band by using International Ultraviolet Explorer (IUE) observations over the period 1979-1993. The ultraviolet observations reveal indication of flare activity in both chromosphere and transition region with their enhanced emission lines. Before and after the flar…
Investigating the effect of surface - exosphere interactions
Johnson, R. E.; Chaufray, J. -Y.; Leblanc, F. +3 more
The surface of planetary airless bodies, also called surface bounded exosphere, like our Moon or Mercury, are directly bombarded by solar particles. The most abundant of those particles are solar wind protons. In the case of the Moon, many observations of low energy neutral atoms have shown that a significant portion of these incident protons are …
Revisiting the high-mass transfer close binary star system AU Monocerotis
Shore, Steven N.; Armeni, Antonio
Context. AU Monocerotis is an eclipsing, double-lined spectroscopic binary with a period of 11 days that is in a state of extreme mass transfer, consisting of a main sequence B-type embedded in a thick accretion disk fed by a Roche lobe overflowing evolved G-type companion. It is also one of the double periodic variable Algol-type binaries.
A…
Candidate cosmic filament in the GJ526 field, mapped with the NIKA2 camera
Berta, S.; Aussel, H.; Adam, R. +44 more
Distinctive large-scale structures have been identified in the spatial distribution of optical galaxies up to redshift z ∼ 1. In the more distant universe, the relationship between the dust-obscured population of star-forming galaxies observed at millimetre wavelengths and the network of cosmic filaments of dark matter apparent in all cosmological…
A Taxonomy for the Configurations of Quadruply Lensed Quasars
Schechter, Paul L.
A simple, novice-friendly scheme for classifying the image configurations of quadruply lensed quasars is proposed. With only six classes, it is intentionally coarse grained. It focuses on the kitelikeness and circularity of these configurations, or the absence thereof. Other features are deliberately ignored, their importance to professional astro…
Infrared Line Emissions from Atoms and Atomic Ions in NGC 7027: Improved Wavelength Determinations for Infrared Metal Lines and a Probable Detection of Zn5+
Neufeld, David A.
An infrared L- and M-band spectral survey, performed toward the young planetary nebula NGC 7027 with the iSHELL instrument on NASA's Infrared Telescope Facility (IRTF), has revealed more than 20 vibrational lines of the molecules HeH+, H2, and CH+ and more than 50 spectral lines of atoms and atomic ions. The presen…
A new estimate of galaxy mass-to-light ratios from flexion lensing statistics
Fabritius, Joseph M.; Goldberg, David M.
We perform a flexion-based weak gravitational analysis of the first two Hubble Frontier Field clusters: Abell 2744 and MACS 0416. A parametric method for using radially projected flexion signals as a probe of cluster member mass is described in detail. The normalization and slope of a L - θE (as a proxy for L - σ) scaling relation in ea…
Localization of cosmic gamma-ray bursts in interplanetary space with MGNS/BepiColombo and HEND/Mars Odyssey experiments
Golovin, D. V.; Kozyrev, A. S.; Litvak, M. L. +3 more
This paper describes the methods and results for the localization by triangulation of cosmic gamma-ray bursts (GRBs) independently observed by two space experiments: the Mercury Gamma-ray and Neutron Spectrometer (MGNS) and the High Energy Neutron Detector (HEND). MGNS is onboard the MPO/BepiColombo mission and on a stage of cruise to Mercury wher…
Ensemble Numerical Simulations of Realistic SEP Events and the Inspiration for Space Weather Awareness
Li, Gang; Wang, Xin; Luo, Bingxian +5 more
The solar energetic particle (SEP) event is a kind of hazardous space weather phenomena, so its quantitative forecast is of great importance from the aspect of space environmental situation awareness. We present here a set of SEP forecast tools, which consists of three components : (1) a simple polytropic solar wind model to estimate the backgroun…
The harsh environment where exoplanets live
Pillitteri, Ignazio