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Census of Variable Stars toward Serpens Main
Chen, Zhiwei; Li, Yao; Haas, Martin +7 more
We monitored a 3 deg2 area toward Serpens Main in the Pan-STARRS1 r, i, and z bands from 2016 April to September. Light curves of more than 11,000 stars in each band were obtained, and 143 variables have been identified. Among those, 119 variables are new discoveries, while 24 variables were previously known. We present variability clas…
Magnetic flux structuring of the quiet Sun internetwork. Center-to-limb analysis of solar-cycle variations
Faurobert, M.; Ricort, G.
Context. The small-scale magnetism of the quiet Sun has been investigated by various means in recent decades. It is now well established that the quiet Sun contains in total more magnetic flux than active regions and represents an important reservoir of magnetic energy. But the nature and evolution of these fields remain largely unknown.
Aims…
VZ Sex: X-Ray Confirmation of Its Intermediate Polar Nature
Nucita, A. A.; De Paolis, F.; Ingrosso, G. +3 more
Intermediate polars are members of the cataclysmic variable binary stars. They are characterized by a moderately magnetized white dwarf accreting matter from a cool main-sequence companion star. In many cases, this accretion gives rise to a detectable X-ray emission. VZ Sex is an interesting X-ray source whose nature needs a robust confirmation. H…
Searching for Low-mass Population III Stars Disguised as White Dwarfs
Schlaufman, Kevin C.; Chandra, Vedant
It is uncertain whether or not low-mass Population III stars ever existed. While limits on the number density of Population III stars with M* ≈ 0.8 M⊙ have been derived, using Sloan Digital Sky Survey (SDSS) data, little is known about the occurrence of Population III stars at lower masses. In the absence of reliable parallax…
Visibility analysis of Phobos to support a science and exploration platform
Sefton-Nash, Elliot; Cardesín-Moinelo, Alejandro; Witasse, Olivier +3 more
The surfaces of the Martian moons, Phobos and Deimos may offer a stable environment for long-term operation of platforms. We present a broad assessment of potential scientific investigations, as well as strategic and operational opportunities offered by long-term operation of an instrumented lander. Studies using observations of Mars' moons, and t…
V488 Per Revisited: No Strong Mid-infrared Emission Features and No Evidence for Stellar/substellar Companions
Howard, Andrew W.; Zuckerman, B.; Song, Inseok +4 more
We present characterization of the planetary system architecture for V488 Per, the dustiest main-sequence star known with a fractional infrared luminosity of ≈16%. Far-infrared imaging photometry confirms the existence of an outer planetary system dust population with a blackbody-fit temperature of ≈130 K. Mid-infrared spectroscopy probing the pre…
Studies of emission regions of the X-ray pulsar Hercules X-1 with pulse-phase-resolved spectra observed with Suzaku
Dotani, Tadayasu; Inoue, Hajime; Kondo, Keisuke
Pulse-phase-resolved X-ray spectra of the X-ray pulsar Her X-1 observed with Suzaku are analyzed. The analysis is based on a hypothesis that the observed variations of the continuum spectra associated with the neutron star spin originate in the changes of the projection areas of the emission regions viewed from the observer, and that the spectral …
Broad-velocity-width Molecular Features in the Galactic Plane
Oka, Tomoharu; Tsujimoto, Shiho; Iwata, Yuhei +2 more
We performed a systematic search for broad-velocity-width molecular features (BVFs) in the disk part of our Galaxy by using the CO J = 1-0 survey data obtained with the Nobeyama Radio Observatory 45 m telescope. From this search, 58 BVFs were identified. In comparisons with the infrared and radio continuum images, 36 BVFs appeared to have both inf…
FPGA Design for On-Board Measurement of Intermittency From In-Situ Satellite Data
Echim, M. M.; Teodorescu, E.; Deak, N. +2 more
Intermittency is a fundamental property of space plasma dynamics, characterizing turbulent dynamical variables as well as passive scalars. Its qualitative and quantitative description from in-situ data requires an accurate estimation of the probability density functions (PDFs) of fluctuations and their moments, particularly the flatness, a normali…
Geological History of Southeastern Gorgonum Chaos, Mars: A Story of Water and Wind
Hauber, Ernst; Adeli, Solmaz; Haack, David
Gorgonum Chaos is part of the Eridania paleolake in Terra Sirenum and displays a number of prominent light-toned morphological features that bear a record of the regional climatic conditions throughout most of Martian history. Based on an intergrated analysis of orbital data, we mapped a 1,500 km2 area in the southeast of Gorgonum Chaos…