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Kinematics of stars in the northern and southern galactic hemispheres
Tsvetkov, A. S.; Vityazev, V. V.
We use vector spherical harmonics for a kinematic analysis of the proper motions of stars from the Hipparcos, Tycho-2, and UCAC3 catalogues in the northern and southern Galactic hemispheres. We have found that the statistically reliable values of the Ogorodnikov-Milne model parameters M {32/+} and M {32/-
Ptolemy operations and results during the Lutetia flyby
Andrews, D. J.; Leese, M. R.; Zarnecki, J. C. +6 more
The September 5th 2008 Rosetta flyby of asteroid 2867 Šteins raised tantalising questions concerning the possibility of outgassing and extant exospheres surrounding small bodies within the asteroid belt. With this in mind and recognising the size and composition of asteroid 21 Lutetia it was decided to attempt a detection of such possible outgassi…
Orbits of the visual binaries ADS 8814 and ADS 8065 from observations along a short arc
Kiselev, A. A.; Romanenko, L. G.; Kiyaeva, O. V. +1 more
The orbits of the visual binaries ADS 8814 and ADS 8065 are determined for the first time. The orbits were calculated using the parameters of the apparent motion, based on position observations along short arcs obtained on the 26-inch refrector of the Pulkovo Observatory, supplemented with radial-velocity observations for the stellar components in…
The rates and time-delay distribution of multiply imaged supernovae behind lensing clusters
Richard, Johan; Hjorth, Jens; Li, Xue
Time delays of gravitationally lensed sources can be used to constrain the mass model of a deflector and determine cosmological parameters. We here present an analysis of the time-delay distribution of multiply imaged sources behind 17 strong lensing galaxy clusters with well-calibrated mass models. We find that for time delays less than 1000 days…
Proper Motions of the HH 110/270 System
Bally, J.; Raga, A. C.; Kajdič, P. +2 more
We present a study of the HH 110/270 system based on three sets of optical images obtained with the ESO New Technology Telescope, the Subaru Telescope, and the Hubble Space Telescope (HST). The ground-based observations are made in the Hα and [S II] emission lines and the HST observations are made in the Hα line only. Ground-based observations rev…
Energetic Fermi/LAT GRB 100414A: Energetic and Correlations
Yamaoka, Kazutaka; Tashiro, Makoto S.; Urata, Yuji +2 more
This study presents multi-wavelength observational results for energetic GRB 100414A with GeV photons. The prompt spectral fitting using Suzaku/WAM data yielded spectral peak energies of E src peak of 1458.7+132.6 - 106.6 keV and E iso of 34.5+2.0 - 1.8 × 1052 …
Measuring the black hole masses in accreting X-ray binaries by detecting the Doppler orbital motion of their accretion disc wind absorption lines
Yao, Yangsen; Zhang, Shuang-Nan; Liao, Jinyuan
So far essentially all black hole masses in X-ray binaries have been obtained by observing the companion star's velocity and light curves as functions of the orbital phase. However, a major uncertainty is the estimate of the orbital inclination angle of an X-ray binary. Here we suggest to measure the black hole mass in an X-ray binary by measuring…
Statistical ring current of Saturn
Carbary, J. F.; Arridge, C. S.; Achilleos, N.
The statistical ring current of Saturn has been determined from the curl of the median magnetic field derived from over 5 years of observations of the Cassini magnetometer. The main issue addressed here is the calculation of the statistical ring current of Saturn by directly computing, for the first time, the symmetrical part of the ring current J…
XMM-Newton and Swift observations of the Type IIb supernova 2011dh in Messier 51
Campana, Sergio; Immler, Stefan
The Type IIb supernova (SN) 2011dh exploded in the nearby galaxy M51 (the Whirlpool galaxy) and provides us with one of the best laboratories to study early high-energy emission from SNe. We give here a comprehensive view of the X-ray properties of SN 2011dh from the analyses of two pointed XMM-Newton early observations as well as the full Swift X…
New observation strategies for the solar UV spectral irradiance
Dudok de Wit, Thierry; Kretzschmar, Matthieu; Lilensten, Jean +2 more
Many applications in space weather and in space situational awareness require continuous solar spectral irradiance measurements in the UV, and to a lesser degree in the visible band. Most space-borne solar radiometers are made out of two different parts: (i) a front filter that selects the passband and (ii) a detector that is usually based on sili…