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Comprehensive study of the Galactic Planetary Nebula NGC 2792
Ali, A.; Snaid, S.; Alruhaili, A.
This paper describes integral field unit (IFU) spectroscopic observations of the Galactic planetary nebula (PN) NGC 2792. The physical conditions, chemical composition, and kinematic properties are discussed and found to be in good agreement with prior long-slit-based investigations. The intensity of the He II line indicates that the nebula is of …
First Detailed Analysis of a Relatively Deep, Low Mass-ratio Contact Binary: ATO J108.6991+27.8306
Zhang, Yu; Ma, Shuo; Liu, Jinzhong +3 more
We present the first detailed photometric analysis of ATO J108.6991+27.8306 (hereinafter as J108). The short-period close binary J108 was observed by the Nanshan 1 m Wide Field Telescope of the Xinjiang Astronomical Observatory. The obtained BVRI-band light curves were used to determine the photometric solution by using the 2003 version of the Wil…
Supernova Remnants in the Irregular Galaxy NGC 4449
Blair, William P.; Long, Knox S.; Winkler, P. Frank
The nearby irregular galaxy NGC 4449 has a star formation rate of ~0.4M ☉ yr-1 and should host of order 70 supernova remnants (SNRs) younger than 20,000 yr, a typical age for SNRs expanding into an interstellar medium (ISM) with a density of 1 cm-3 to reach the radiative phase. We have carried out an optical imagin…
NGC 2022, a case study of a multiple-shell planetary nebula
Chu, Y. -H.; Guerrero, M. A.; Toalá, J. A. +7 more
We present a detailed study of the physical properties, history of mass loss, and chemical abundances of the planetary nebula NGC 2022. New imaging observations obtained with the OAJ/JAST80 and NOT/ALFOSC confirm the presence of a faint ~88 arcsec halo surrounding a double-layered elliptical structure that consists of a bright 21.4 × 16.7 arcsec i…
Searching for single-frame rapid X-ray transients detected with Chandra
Feng, Hua; Zhang, Yijia
We propose a new method to identify rapid X-ray transients observed with focusing telescopes. They could be statistically significant if three or more photons are detected with Chandra in a single CCD frame within a point-spread-function region out of quiescent background. In the Chandra archive, 11 such events are discovered from regions without …
The Spitzer-HETDEX Exploratory Large-Area Survey. IV. Model-based Multiwavelength Photometric Catalog
Papovich, Casey; Finkelstein, Steven L.; Chworowsky, Katherine +11 more
We present a 0.3-4.5 µm 16-band photometric catalog for the Spitzer/HETDEX Exploratory Large-Area (SHELA) survey. SHELA covers an ~27 deg2 field within the footprint of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). Here we present new DECam imaging and an rizK s band-selected catalog of four million sour…
A Data-constrained Scheme for the Reconstruction of Solar Wind Parameters in the Inner Heliosphere
Feng, Xueshang; Zhang, Man; Liu, Xiaojing +1 more
With the development of our industrial society, the reconstruction of solar wind parameters in the inner heliosphere becomes very important to understanding the interplanetary propagation of various types of space weather disturbance. However, the situ observations of solar wind parameters are only applicable to several points where spacecraft are…
Mid-Infrared Spectroscopy of Feldspars From the Bühl Basalt (Northern Hesse, Germany) Formed Under Reducing Conditions as Terrestrial Analogue of Mercury for MERTIS
Hiesinger, Harald; Helbert, Jörn; Weber, Iris +6 more
The MErcury Radiometer and Thermal Infrared Spectrometer instrument onboard the BepiColombo spacecraft is designed to investigate Mercury's surface in the mid-infrared (mid-IR). Based on MESSENGER data and modeling, Mercury is thought to be evolved under highly reducing conditions (e.g., McCubbin et al., 2017,
CO, H2O, and CH4 in the dusty atmosphere of a ≲5 Myr-old exoplanet
Gaidos, Eric; Hirano, Teruyuki
Very young massive planets are sufficiently luminous by their internal heat of formation to permit detailed studies, including spectroscopy of their atmospheres with large telescopes at sufficient resolution (λ/Δλ ≳ 1000) to identify major constituents to inform models of planet formation and early evolution. We obtained 1-2.4 µm (YJHK) spec…
Cloud chemistry on Venus: Sulfuric acid reactions and supercooling in Venus liquid cloud droplets
Baines, K. H.; Delitsky, M. L.
Cloud particles on Venus consist of liquid droplets of aqueous sulfuric acid solutions (H2SO4/H2O) that are the site of chemical reactions arising from uptake (absorption) of surrounding gas molecules into the droplets and subsequent solution chemistry. The Henry's Law constant, H*, for HCl in sulfuric acid in wate…