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Binary Star Population with Common Proper Motion in Gaia DR2
Kovaleva, D. A.; Malkov, O. Yu.; Sapozhnikov, S. A. +1 more
<sec id="ASec1"><title>Abstract—We describe a homogeneous catalog compilation of common proper motion stars based on Gaia DR2. A preliminary list of all pairs of stars within the radius of 100 pc around the Sun with a separation less than a parsec was compiled. Also, a subset of comoving pairs, wide binary stars, was selected. The clus…
Benford's law in the Gaia universe
de Bruijne, Jos; de Jong, Jurjen; De Ridder, Joris
Context. Benford's law states that for scale- and base-invariant data sets covering a wide dynamic range, the distribution of the first significant digit is biased towards low values. This has been shown to be true for wildly different datasets, including financial, geographical, and atomic data. In astronomy, earlier work showed that Benford's la…
The H I Structure of the Local Volume Dwarf Galaxy Pisces A
Peek, J. E. G.; Putman, Mary E.; Tollerud, Erik J. +2 more
Dedicated H I surveys have recently led to a growing category of low-mass galaxies found in the Local Volume. We present synthesis imaging of one such galaxy, Pisces A, a low-mass dwarf originally confirmed via optical imaging and spectroscopy of neutral hydrogen (H I) sources in the Galactic Arecibo L-band Feed Array H I survey. Using H I observa…
Testing the Cosmic Distance Duality Relation with the Latest Strong Gravitational Lensing and Type Ia Supernovae
Xia, Jun-Qing; Lyu, Meng-Zhen; Li, Zheng-Xiang
We perform a model-independent and comprehensive test on the cosmic distance duality relation (CDDR) by combining the latest observations of strong gravitational lensing (SGL) including a total of 161 well-measured systems from several surveys and observations of Type Ia supernovae (SNe Ia), I.e., the joint light-curve analysis of SNe Ia and the P…
Kinematics of T Tauri Stars Close to the Sun from the Gaia DR2 Catalogue
Bobylev, V. V.
The spatial and kinematic properties of a large sample of young T Tauri stars from the solar neighborhood 500 pc in radius have been studied. The following parameters of the position ellipsoid have been determined from the most probable members of the Gould Belt: its sizes are $350× 270× 87$ pc and it is oriented at an angle of $14^{\circ}± 1^{\ci…
Testing Comptonization as the Origin of the Continuum in Nonmagnetic Cataclysmic Variables: The Photon Index of X-Ray Emission
Maiolino, T.; Titarchuk, L.; Wang, W. +4 more
The X-ray spectra of nonmagnetic cataclysmic variables (nmCVs) in the ∼0.3-15 keV energy band have been described by either one or several optically thin thermal plasma components or by cooling flow models. We tested whether the spectral continuum in nmCVs could be successfully described by Comptonization of soft photons off hot electrons presente…
Identifying the 3FHL Catalog. IV. Swift Observations of Unassociated Fermi-LAT 3FHL Sources
Ajello, M.; Marchesi, S.; Kaur, A. +3 more
The Fermi Large Area Telescope (Fermi-LAT) 3FHL catalog is the latest catalog of >10 GeV sources and will remain an important resource for the high-energy community for the foreseeable future. Therefore, it is crucial that this catalog is made complete by providing associations for most sources. In this paper, we present the results of the X-ra…
Hubble Space Telescope Astrometry of the Metal-poor Visual Binary µ Cassiopeiae: Dynamical Masses, Helium Content, and Age
Schaefer, Gail H.; Bond, Howard E.; Gilliland, Ronald L. +1 more
µ Cassiopeiae is a nearby, high-velocity, metal-poor ([Fe/H] = -0.81) visual binary. We have used high-resolution imaging with the Hubble Space Telescope (HST), obtained over nearly two decades, to determine the period (21.568 yr) and precise orbital elements. Combining these with published ground- and space-based astrometry, we determined d…
Simultaneous Observation of Negatively and Positively Charged Nanograins at Comet 67P/Churyumov-Gerasimenko
Goldstein, R.; Goetz, Charlotte; LLera, K. +1 more
Observations near comet 67P by Rosetta show evidence of charged nanograins. Specifically, the ion and electron sensor (IES) observed negative particles with energy/charge (E/q) consistent with charged nanograins. However, theory predicts that both polarities should be present. On 19 September 2014, IES detected positively and negatively charged pa…
The GRAVITY young stellar object survey. III. The dusty disk of RY Lup
Genzel, R.; Sturm, E.; Ménard, F. +55 more
Context. Studies of the dust distribution, composition, and evolution of protoplanetary disks provide clues for understanding planet formation. However, little is known about the innermost regions of disks where telluric planets are expected to form.
Aims: We aim constrain the geometry of the inner disk of the T Tauri star RY Lup by combining…