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A nuclear ionized gas outflow in the Seyfert 2 galaxy UGC 2024
Robinson, Andrew; Schnorr-Müller, Allan; Storchi-Bergmann, Thaisa +15 more
As part of a high-resolution observational study of feeding and feedback processes occurring in the vicinity of the active galactic nucleus in 40 galaxies, we observed the inner 3{^''.}5 × 5 arcsec of the nearby spiral and Seyfert 2 galaxy UGC 2024 with the integral field unit of the Gemini-South Telescope. The observations enabled a st…
Detailed spectroscopic and photometric study of three detached eclipsing binaries
Kahraman Aliçavuş, F.; Aliçavuş, F.
Detached eclipsing binaries are remarkable systems to provide accurate fundamental stellar parameters. Fundamental stellar parameters and the metallicity values of stellar systems are needed to deeply understand stellar evolution and formation. In this study, we focus on the detailed spectroscopic and photometric studies of three detached eclipsin…
The Case for a Large-scale Occultation Network
Rice, Malena; Laughlin, Gregory
We discuss the feasibility of and present initial designs and approximate cost estimates for a large (N ∼ 2000) network of small photometric telescopes that is purpose-built to monitor V ≲ 15 Gaia mission program stars for occultations by minor solar system bodies. The implementation of this network would permit measurement of the solar system’s t…
Spectral analysis of the barium central star of the planetary nebula Hen 2-39
Boffin, H. M. J.; Jones, D.; Löbling, L.
Context. Barium stars are peculiar red giants characterized by an overabundance of the elements synthesized in the slow neutron-capture nucleosynthesis (s-process elements) along with an enrichment in carbon. These stars are discovered in binaries with white dwarf companions. The more recently formed of these stars are still surrounded by a planet…
Search for the evolutionary relationship between Galactic globular and open clusters using data from the Gaia DR2 catalogue
Bobylev, V. V.; Bajkova, A. T.
Passing through the Galactic disc, a massive object such as a globular cluster, can trigger star formation process leading to the birth of open clusters. Here, we analyse such possible evolutionary relationship between globular and open clusters. To search for the closest rapprochement between objects we computed backwards the orbits of 150 Galact…
Multiscale estimation of the field-aligned current density
Vogt, Joachim; Marghitu, Octav; Bunescu, Costel +1 more
Field-aligned currents (FACs) in the magnetosphere-ionosphere (M-I) system exhibit a range of spatial and temporal scales that are linked to key dynamic coupling processes. To disentangle the scale dependence in magnetic field signatures of auroral FACs and to characterize their geometry and orientation, Bunescu et al. (2015) introduced the multis…
Multivariate Time-series Analysis of Variable Objects in the Gaia Mission
Bouchy, Francois; Holl, Berry; Rimoldini, Lorenzo +5 more
In astronomy, we are witnessing an enormous increase in the number of source detections, precision, and diversity of measurements. Additionally, multi-epoch data is becoming the norm, making time-series analyses an important aspect of current astronomy. The Gaia mission is an outstanding example of a multi-epoch survey that provides measurements i…
Long-term X-ray variation of the colliding-wind Wolf-Rayet binary WR 125
Sugawara, Yasuharu; Ebisawa, Ken; Midooka, Takuya
WR 125 is considered to be a colliding-wind Wolf-Rayet binary (CWWB), from which the most recent infrared flux increase was reported between 1990 and 1993. We observed the object four times from 2016 November to 2017 May with Swift and XMM-Newton, and carried out a precise X-ray spectral study for the first time. There were hardly any changes in t…
SIMBIO-SYS/STC stereo camera calibration: Geometrical distortion
Da Deppo, Vania; Slemer, Alessandra; Amoroso, Marilena +10 more
The STereo imaging Channel (STC) is the first push-frame stereo camera on board an European Space Agency (ESA) satellite, i.e., the ESA-Japan Aerospace eXploration Agency mission BepiColombo. It was launched in October 2018, and it will reach its target, Mercury, in 2025. The STC main aim is to provide the global three-dimensional reconstruction o…
Spectral properties of gamma-ray bursts observed by the Suzaku wide-band all-sky monitor
Yamaoka, Kazutaka; Fukazawa, Yasushi; Kokubun, Motohide +17 more
We have systematically studied the spectral properties of 302 localized gamma-ray bursts (GRBs) observed by the Suzaku wide-band all-sky monitor (WAM) from 2005 August to 2010 December. The energy spectra in the 100-5000 keV range integrated over the entire emission and the 1 s peak were fitted by three models: a single power law, a power law with…