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X-Ray Warm Absorber Variability of the Seyfert Galaxy Arakelian 564
Nouh, M. I.; Korany, B.
We studied the variability of warm absorber clouds of ionized gas within AGN for the Seyfert 1 galaxy Arakelian 564. The X-ray spectra for four XMM-Newton observations of this object are analyzed using the EPIC and the RGS instruments. These four observations covered 11 years. The ionization parameter ξ of the absorbing matter changed between obse…
A steep bandpass interference filter with FWHM 11nm centered at 1254nm for studying Lyman Alpha signatures of highly redshifted galaxies
Herrero, A.; Marín-Franch, A.; Guzmán, R. +9 more
The presented new 1% narrowband filter centered at 1254nm with a FWHM of 11nm required and achieved excellent maximum transmission and deep out of band blocking. Magnetron sputtering was used for the filter coating process. The filter was used in the fully cryogenic near-infrared camera CIRCE of the Gran Telescopio Canarias (GTC) Telescope. The go…
Variability analysis of δ Scuti candidate stars
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +5 more
The Hipparcos catalogue contains stars suspected to be δ Scuti variables for which extensive groundbased observations and characterisation of variability are desired. We obtained 24 215 CCD images with the 35/51 cm Maksutov-type robotic telescope at the Molėtai Astronomical Observatory (MAO, Lithuania) of thirteen δ Scuti candidates selected from …
Corrigendum to "Decadal Timescale Variability of the Enceladus Plumes Inferred from Cassini Images" [ICARUS, 282 (15 Jan 2017) pages 260-275]
Ingersoll, Andrew P.; Ewald, Shawn P.
Tables S2 and S3 are now included in the Supplementary Online Material for this article.
Stray light calibration for the Solar Orbiter/Metis solar coronagraph
Romoli, M.; Andretta, V.; Uslenghi, M. +20 more
The Solar Orbiter/Metis visible and UV solar coronagraph redefines the concept of external occultation in solar coronagraphy. Classical externally occulted coronagraphs are characterized by an occulter in front of the telescope entrance aperture. Solar Orbiter will approach the Sun down to 0.28 AU: in order to reduce the thermal load, the Metis de…
Project BMK10k: Zeiss Ballistische Messkammer with a 10k × 10k CCD for ground‑based PLATO support
Chini, Rolf; Strassmeier, Klaus G.; Granzer, Thomas +5 more
Ballistische Messkammer with 10k CCD's (BMK10k) central goal is supporting the upcoming PLAnetary Transits and Oscillation of stars (PLATO) mission by reducing its number of false positives (planet‑compatible transit candidates but not planets at the end). For Kepler, the number of false positives had been estimated to still be about 10%. Understa…
Oxygen Ion Flow Reversals in Earth's Magnetotail: A Cluster Statistical Study
Gunell, H.; Nilsson, H.; Hamrin, M. +5 more
We present a statistical study of magnetotail flows that change direction from earthward to tailward using Cluster spacecraft. More precisely, we study 318 events of particle flux enhancements in the O+ data for which the pitch angle continuously changes with time, either from 0° to 180° or from 180° to 0°. These structures are called "…
NOMAD/TGO and PFS/MEx joint analysis for the retrieval of trace gases in the Martian atmosphere
Nardi, Luca
Search for variable stars in the northern sky: analysis of photometric time series for 3598 stars
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +6 more
As extensive ground-based observations and characterisation of different variable stars are of the utmost importance in preparing optimal input catalogues for space missions, our aim was to search for new variable stars in selected fields of the northern sky. We obtained 24 470 CCD images and analysed photometric time series of stars using the DAO…
Some Kinematical Properties of Solar Motion Using Stellar Associations
Elsanhoury, W. H.; Elkhateeb, M. M.
In this paper, we have constructed many models of the Solar motion and the kinematical properties for a sample of 5100 main sequence stars; into which 1528 early types (B5, A0, A5, F0, and F5) and about 3572 late types (G0, G5, K0, and K5). The sample was collected with aid of Extended Hipparcos Compilation (XHIP) Cross references. Based on the sp…