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High resolution spectroscopy of Seyfert warm absorbers with XMM-Newton
Kaastra, J. S.; Behar, E.; Sako, M. +5 more
We present results from the analysis of an XMM-Newton observation of the Seyfert 1 galaxy NGC 7469, the first high resolution X-ray spectrum of this source. The Reflection Grating Spectrometer (RGS) spectrum has several narrow absorption and emission lines of O, N, C and Ne, originating from gas at a range of ionisation parameters, from log ξ∼1.6 …
Re-Evaluation of the Flare Type II CME Association
Kim, Y. -H.; Moon, Y. -J.; Shanmugaraju, A. +2 more
We have re-evaluated the association of type II solar radio bursts with flares and/or coronal mass ejections (CMEs) using the year 2000 solar maximum data. For this, we consider 52 type II events whose associations with flares or CMEs were absent or not clearly identified and reported. These events are classified as follows; group I: 11 type IIs f…
On putting the catalogues of the relative proper motions of open cluster stars in one system (cluster M67)
Loktin, A. V.
In this paper a method for putting the catalogues of the proper motions of cluster stars in one system is discussed on the base of numerical experiments. The catalogue of proper motions of stars in the field of open cluster M67 based on five catalogues of relative proper motions and the Tycho-2 catalogue is compiled.
A joint Cluster and ground-based instruments study of two magnetospheric substorm events on 1 September 2002
Lester, M.; Bosqued, J.; Provan, G. +9 more
We present a coordinated ground- and space-based multi-instrument study of two magnetospheric substorm events that occurred on 1 September 2002, during the interval from 18:00 UT to 24:00 UT. Data from the Cluster and Polar spacecraft are considered in combination with ground-based magnetometer and HF radar data. During the first substorm event th…
Radar detection of subsurface features on Mars
Orosei, R.; Kartashov, D. V.; Shchuko, O. B.
The structure of the pulse radar signal reflected from continuously changing layered Martian crust is investigated theoretically. As a simple model of stratigraphy, we considered one layer with electrodynamics' parameters increasing or decreasing exponentially upon a depth laying on monolith base and covered by homogeneous layer. This exponential …
The central region of NGC 3077: ground-based photometry and age of bright `starlike' objects
Karachentsev, I. D.; Makarova, L. N.; Notni, P.
We present UBVI_C photometry of starlike objects in the central region of NGC 3077. The colour-colour and colour-magnitude diagrams of the objects are discussed. Many of the objects under consideration, starlike from the ground, are probably dense young star clusters (super star clusters, SSC). Ages spreading over ∼4 to ∼150 Myr are estimated for …
Multiple Flux Rope Events at the High-Latitude Magnetopause on January 26, 2001: Current Density Calculation
Glassmeier, K. -H.; Shen, Chao; Cao, Jin-Bin +12 more
A systematic comparison is carried out for three methods of current density calculation based on simultaneous magnetic field measurements of four-spacecraft Cluster mission. It is demonstrated analytically and numerically that within the linear approximation, all these methods lead to exactly the same results. As a case study, the current density …
The close binary system SU Ind
Budding, E.; Zeilik, M.; Rhodes, M. +1 more
Photometric data on the southern mid-F type close eclipsing binary system SU Ind from the Carter Observatory (NZ) were examined, together with a light curve obtained from the Hipparcos Epoch Photometry (HEP) database. The system appears detached, although appreciably evolved from the Zero Age Main Sequence. The HEP period must be accurate for its …
Dependence of frequency of nonlinear cold plasma cylindrical oscillations on electron density
Fainberg, J.; Osherovich, Vladimir
For cold plasma, the frequency of small amplitude Langmuir oscillations along one Cartesian coordinate is ωpo=√4πe2no/me , where np=no is the constant proton density which is equal to the average electron density ne¯. This formula for ωpo is the basis for measu…
High Spatial Resolution Hubble Space Telescope NICMOS Observations of Markarian 231
Schneider, G.; Neugebauer, G.; Low, F. J.
Observations of Markarian 231 at 1.1 µm taken with NICMOS on the Hubble Space Telescope are described. The brightness of the object in the near-infrared, and the inherent short-term stability of the NICMOS optical and instrumental system, enables the application of special observational and analysis techniques that effectively increase high …