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Towards an Understanding of Radial Velocity Shift in Uv Spectra of Symbiotic Stars
Friedjung, Michael; Mikołajewska, Joanna
A systematic redshift of high ionization resonance emission lines relative to the intercombination lines was found by Friedjung et al. (1883, A & A126, 4071983) in the UV spectra of a number of symbiotic binaries. The interpretation was not then clear. We present a study of archival IUE and GHRS/HST spectra of the symbiotic binary CI Cyg. The …
Solution of Earth orientation parameters in the frame of new Earth Orientation Catalogue
Vondr'ak, J.; Ron, C.
The new Earth Orientation Catalogue was recently derived, based mostly on the ARIHIP and Tycho-2 Catalogues that were combined with ground-based optical observations of latitude and Universal Time variations in the 20th century. The solution of Earth orientation parameters, based on this new star catalogue and the new IAU model of precession-nutat…
All-sky census of galactic open cluster stars
Piskunov, A. E.; Kharchenko, N. V.; Scholz, R. D. +2 more
We present the results of a systematic study of the wider neighbourhoods of 520 Galactic open clusters from data of the all-sky high-precision homogeneous catalogue ASCC-2.5. About 30,000 members have been selected on the basis of proper motion, photometric and spatial criteria. Angular and linear sizes of cluster cores and coronas, mean cluster p…
Observation of a substorm onset on 12 September 2001
Balogh, A.; Dandouras, I.; Thomsen, M. +4 more
The orbits of Polar and Cluster spacecraft in 2001-2003 are extremely well suited to investigate substorms. Here, we discuss a substorm onset on 12 September 2001 between 1800 and 1915 UT. At this time, the Polar spacecraft was at 8 Re, 0034 LT, 70° invariant latitude (IL) and the Cluster spacecraft was at 19.3 Re, 2330 LT, 77° IL. The geostationa…
Shock parameter calculations at weak interplanetary shock waves
Balogh, A.; Gloag, J. M.
A large set of interplanetary shock waves observed using the Ulysses spacecraft is analysed in order to determine their local parameters. For the first time a detailed analysis is extended to the thermodynamic properties of a large number of events. The intention is to relate the shock parameters to the requirements set by MHD shock theory. A unif…
Multi-phase interstellar clouds in the Vela SNR resolved with XMM-Newton
Miceli, M.; Bocchino, F.; Reale, F. +1 more
XMM-Newton spatial/spectral resolution and high effective area allow to deepen our knowledge about the shocks in Supernova Remnants and their interaction with the interstellar medium. We present the analysis of an EPIC observation of the northern rim of the Vela SNR and we compare the X-ray and optical morphology of the emission. We derive a descr…
Temporal profiles of solar energetic particle events from SOHO/EPHIN data
Kunow, H.; Muller-Mellin, R.; Gómez-Herrero, R. +3 more
Temporal profiles of energetic ions and electrons observed at 1 AU during solar energetic particle events are mainly determined by particle injection features, the observer location relative to the source region at the Sun, and the interplanetary space plasma and field conditions during particle transport. In this work, temporal profiles of 18 sol…
Modelling Cosmic Ray Element Spectra and Ionization in the Ionospheres and Atmospheres of Terrestrial and Jovian Planets
Buchvarova, M.; Velinov, P. I. Y.; Kobylinski, Z.
The galactic (GCRs) and anomalous (ACRs) cosmic rays form the lower parts of the planetary ionospheres. For this purpose analytical and numerical spectra for cosmic particles are necessary. Our knowledge of GCR modulation in the solar system was greatly enhanced thanks to the heliospheric missions, Voyagers 1 and 2, Pioneer 10 and Ulysses. In this…
Near infrared imaging of the broad absorption line quasar BAL QSO 0134+3253
Eckart, A.; Zuther, J.
In this paper we present near infrared (NIR) imaging data of the host galaxy of the broad absorption line quasar (BALQ) at z=2.169, serendipitously found close to 3C 48 (Canalizo et al. 1998, AJ, 115, 890). The data were obtained with the ESO-VLT camera ISAAC during period 67. We find extended, rest-frame optical emission around the BALQ after sub…
IUE Spectra of Seyvert 1 Galaxy NGC 7469- BLR Characteristics of NGC 7469
Hyung, Siek; Son, Dong-Hoon
From the line ratios of Si III] 1892 to C III] 1909 (Feibelman & Aller 1987), we estimated the BLR electron densities and their changes of Seyfert 1 galaxy NGC 7469 using IUE spectra observed from June 11 to July 29, 1996 (Wanders et al. 1997). We separated blended Si III] and C III] lines using the STARLINK/DIPSO and measured their fluxes wit…