Search Publications
X-ray Emission of ICRF Sources
Tugay, A. V.; Shevchenko, S. Yu.; Voitsekhovskiy, V. V. +1 more
Considering increasing requirements to the coordinates measurement precision by the end of XX century International Astronomical Union commenced implementation of the new astrometric system ICRF (International Celestial Reference Frame). This quasi-inertial reference frame system centered in the barycenter of the Solar System and has axes defined …
Author Correction: Atmospheric mountain wave generation on Venus and its influence on the solid planet's rotation rate
Lebonnois, S.; Navarro, T.; Schubert, G.
In the version of this Article originally published, a statement regarding past measurements of the length of day and rotation rate of Venus was potentially misleading. The original statement has now been replaced in the online versions of this Article, to acknowledge that neither Magellan nor Venus Express measured an instantaneous rotation rate.
Revised and updated catalogue of the First Byurakan Survey of late-type stars: 2nd edition
Gigoyan, K. S.; Kostandyan, G. R.; Mickaelian, A. M.
Eighteen lists of late-type stars (LTSs) have been published between 1990 and 2016. These LTSs have been found in the low-dispersion spectroscopic plates of the First Byurakan Survey (FBS). The systematic search and selection was carried out on a surface _16000 deg2 on almost the whole area of the FBS. As a result, “Revised and Updated Catalogue o…
Astrometry by ground-based telescopes for the Gaia mission
Tanga, Paolo; Thuillot, William; Carry, Benoît +1 more
The space astrometry Gaia mission is operating since July 2014 (Gaia Collaboration; Brown, A. et al., 2016; Gaia Collaboration; Prusti, T et al., 2016). As planned, Gaia detects many moving objects in its fields of view during its scanning process of the sky. Several months were necessary to tune the different parameters for filtering these object…
Foreground contribution to the inferred cosmological parameters from Planck
Vincent, Aaron C.; Wibig, Tadeusz; Wolfendale, Arnold W.
Previous analyses of cosmic microwave background (CMB) measurements [T. Wibig and A. W. Wolfendale, Mon. Not. R. Astron. Soc. 360 (2005) 236, arXiv:astro-ph/0409397; Mon. Not. R. Astron. Soc. 448 (2015) 1030, arXiv:1507.0677.] have revealed contamination by areas of high cosmic ray activity in the Milky Way. Here, we update studies, looking at the…
SMSS J130522.47-293113.0: a high-latitude stellar X-ray source with pc-scale outflow relics?
Schmidt, B. P.; Da Costa, G. S.; Soria, R. +17 more
We report the discovery of an unusual stellar system SMSS J130522.47-293113.0. The optical spectrum is dominated by a blue continuum together with emission lines of hydrogen, neutral, and ionized helium, and the N III, C III blend at ∼4640-4650 Å. The emission-line profiles vary in strength and position on time-scales as short as 1 d, while optica…
Electric potential structures of auroral acceleration region border from multi-spacecraft Cluster data
Sadeghi, S.; Emami, M. R.
This paper studies an auroral event using data from three spacecraft of the Cluster mission, one inside and two at the poleward edge of the bottom of the Auroral Acceleration Region (AAR). The study reveals the three-dimensional profile of the region's poleward boundary, showing spatial segmentation of the electric potential structures and their d…
Feasibility of the debris ring transit method for the solar-like star HD 107146 by an occulted galaxy
Holwerda, B. W.; Schneider, G.; Kenworthy, M. A. +2 more
Occulting galaxy pairs have been used to determine the transmission and dust composition within the foreground galaxy. Observations of the nearly face-on ring-like debris disc around the solar-like star HD 107146 by HST/ACS in 2004 and HST/STIS in 2011 reveal that the debris ring is occulting an extended background galaxy over the subsequent decad…
Thermal Non-equilibrium Plasma Observed by Hinode
Imada, Shinsuke
Analysis of the Systematic Differences between the Stellar Parallaxes of the TGAS and Hipparcos Catalogues Using Spherical Harmonics
Tsvetkov, A. S.; Amosov, F. A.
The systematic differences between the trigonometric parallaxes of the Hipparcos and TGAS catalogues have been investigated using spherical harmonics. The most significant harmonics in the expansion have been determined. The distribution of the parallax difference dispersion in various regions of the celestial sphere has also been studied. The dis…