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Eclipsing binaries in the era of Gaia
Holl, B.; Mowlavi, N.; Lecoeur-Taïbi, I. +3 more
The ESA mission Gaia is expected to detect a few million eclipsing binaries, most of them hitherto unknown. We present an outline of the processing of these objects in the Gaia Data Processing and Analysis Consortium pipeline, with an emphasis on the scientific validation of the software components.
Study of the Streamer Current Sheet with White-Light and UV Observations
Feng, Li; Li, Hui; Shi, Guang-lu +2 more
Current sheets (CSs) are the main region where magnetic reconnections can convert magnetic energy into plasma thermal and kinetic energies. We have studied a CS in the streamer occurred on 3 January 2003 by combining the White-Light (WL) images observed by the Large Angle and Spectrometric Coronagraph (LASCO) and the EUV spectra detected by the Ul…
Martian fan deposits: Insights on depositional processes and origin from mass balance survey
Hynek, Brian M.; Williams, Rebecca M. E.; Di Achille, Gaetano +2 more
Fan deposits located at the mouths of Martian valleys have been interpreted as indicators of wet conditions during Mars history. However, the processes, time and amount of water needed to carve the valleys and form the fans are still debated. Here we present a detailed morphometric and mass balance analysis of valleys and fan-shaped deposits using…
High-Velocity Moving Groups in the Solar Neighborhood in Gaia DR2
Baluev, R. V.; Shaidulin, V. Sh.; Veselova, A. V.
We use an improved wavelet analysis technique to reconstruct the (U,V,W) velocity distribution for ≈250 000 stars from Gaia DR2, located in the solar neighborhood of 200 pc. The 2D wavelet transforms for three bivariate distributions (U,V), (U,W), and (V,W) were investigated. Though most of currently known (low-velocity) stellar moving groups are …
More planetary candidates from K2 Campaign 5 using TRAN_K2
Kovacs, Geza
Context. The exquisite precision of space-based photometric surveys and the unavoidable presence of instrumental systematics and intrinsic stellar variability call for the development of sophisticated methods that distinguish these signal components from those caused by planetary transits.
Aims: Here, we introduce the standalone Fortran code …
The characteristics of the coronal mass ejections preceding the associated X-ray and γ-ray burst solar flares
Abdel-Sattar, Walid; Mawad, Ramy
In this study, investigated 14,786 coronal mass ejection (CME) events and 5092 Gamma-ray Burst Monitor (GBM) solar flare events (called γ-ray burst solar flare) recorded during 2008-2017, by using temporal and spatial conditions criteria, we found 845 (about 16%) CME events associated with γ-ray burst solar flare events only (hereafter, CME-γ-pref…
IVOA HiPS implementation in the framework of WorldWide Telescope
Li, S.; Li, C.; Xu, Y. +9 more
The WorldWide Telescope(WWT) is a scientific visualization platform which can browse deep space images, star catalogs, and planetary remote sensing data from different observation facilities in a three-dimensional virtual scene. First launched and then open-sourced by Microsoft Research, the WWT is now managed by the American Astronomical Society …
[Rb/Zr] ratio in Ba stars as a diagnostic of the companion AGB stellar mass
Shejeelammal, J.; Goswami, Aruna
Understanding nucleosynthesis in and evolution of asymptotic giant branch (AGB) stars is of primary importance as these stars are the main producers of some of the key elements in the Universe. They are the predominant sites for slow-neutron-capture nucleosynthesis (s-process). The exact physical conditions and nucleosynthetic processes occurring …
Star formation rates in the L 1482 filament of the California molecular cloud
Shimajiri, Yoshito; Sunada, Kazuyoshi; Dobashi, Kazuhito +7 more
We measured the trigonometric parallax of the H2O maser source associated with the L 1482 molecular filament hosting the most massive young star, LkHα 101, in the California molecular cloud. The measured parallax is 1.879 ± 0.096 mas, corresponding to the distance of 532 ± 28 pc. This parallax is consistent with that of the nearby star …
The Initiation of a Solar Streamer Blowout Coronal Mass Ejection Arising from the Streamer Flank
Chen, Yao; Zheng, Ruisheng; Wang, Bing
Streamer blowout (SBO) coronal mass ejections (CMEs) represent a particular class of CMEs that are characterized by a gradual swelling of the overlying streamer and a slow CME containing a flux-rope structure. SBO CMEs arising from the streamer flank fall into a special category of SBO CMEs involving three lower arches under the higher streamer ar…