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XMM-Newton observations of OY Car III: OM light curve modelling, X-ray timing and spectral studies
Ramsay, G.; Hakala, P.
We revisit the XMM-Newton observations of the dwarf nova OY Car taken in July 2000 which occured shortly after an outburst. Ramsay et al. (\cite{Ramsay2001a}) found a prominent energy dependent modulation at a period of 2240 s: this modulation was only seen for ∼1/3 of the observation duration. In our new analysis, we examine this time interval in…
UVIS/HDAC Lyman-α observations of the geocorona during Cassini’s Earth swingby compared to model predictions
Keller, H. U.; Werner, S.; Korth, A. +1 more
The Hydrogen Deuterium Absorption Cell (HDAC) is part of the Ultraviolet Imaging Spectrograph (UVIS) experiment aboard the Cassini spacecraft. During Cassini's Earth swingby on August 18, 1999, HDAC was used as a photometer to measure solar Lyman-α radiation scattered by the neutral hydrogen atoms of the geocorona. These data provide information a…
Identification of broad-band waves above the auroral acceleration region: Cluster observations
Balogh, A.; André, M.; Buchert, S. +3 more
We investigate broad-band emissions at frequencies above the ion gyrofrequency on auroral field lines at geocentric distances of about 4.5 Earth radii. Observations by the Cluster satellites are used to study the wave characteristics and to determine the wave modes involved. All events include some bursts of broad-band emissions with a substantial…
The Nature of Near-Ultraviolet-selected Objects in the Chandra Deep Field-South
Gardner, Jonathan P.; Koekemoer, A. M.; Conselice, C. J. +3 more
We present the first results of the pure parallel near-UV observations with the Wide Field Planetary Camera 2 (WFPC2) in the Chandra Deep Field-South. The main goal is to search for the population of objects that contributes to the rise in the volume-averaged star formation rate at intermediate redshifts (z<1). A total of 34 objects were identi…
Kinematical Structure of Wolf-Rayet Winds. II. Internal Velocity Scatter in WN Stars
Niedzielski, A.; Nugis, T.; Skorzynski, W.
The shortward edge of the absorption core velocities - v_black as determined from low resolution archived IUE spectra from the INES database are presented for three P Cyg profiles of NV 1240, HeII 1640 and NIV 1720 for 51 Galactic and 64 LMC Wolf-Rayet stars of the WN subtype. These data, together with v_black of CIV 1550 line presented in Niedzie…
X-Ray Emission from the Warm-Hot Intergalactic Medium
Kaastra, Jelle S.
Visualization and topographical analysis of the Mars surface
Dorninger, P.; Jansa, J.; Briese, Ch.
The Institute of Photogrammetry and Remote Sensing has more than 30 years of experience in computation, visualization and analysis of digital terrain data. Most of the developed methods and algorithms are implemented in the software application SCOP++ and tested on Earth datasets. Due to the institute's involvement into Mars Express, these methods…
The distance to NGC 5904 (M 5) via the subdwarf main sequence fitting method
Testa, V.; Marconi, G.; Andreuzzi, G. +2 more
We present a determination of the distance modulus of the globular cluster NGC 5904 (M 5), obtained by means of the subdwarf main-sequence fitting on the (V,V-I) color-magnitude diagram. The subdwarf sample has been selected from the HIPPARCOS catalog in a metallicity range homogeneous with the cluster ([Fe/H] ≃ -1.1). Both the cluster and the sub…
The Pattern of Moving Magnetic Inhomogeneities in and Around Sunspots
Venkatakrishnan, P.; Kumar, Brajesh; Ravindra, B.
High-resolution MDI magnetograms are used to study the pattern of moving magnetic inhomogeneities in sunspots. We examine the inward and outward moving features in sunspots. The velocity of these features is small in the umbra while it is about 0.5 km s−1 in the outer penumbra. The inward and outward moving features may be the possible …
The Counterarc to MS 1512-cB58 and a Companion Galaxy
Teplitz, Harry I.; Malkan, Matthew A.; McLean, Ian S.
We present near-infrared spectra of ``A2,'' the primary counterarc to the gravitationally lensed galaxy MS 1512-cB58. The spectra show redshifted Hα, [N II], [O III], and Hβ at z=2.729+/-0.001. We observe the same Hα/[O III] ratio as cB58, which together with the redshift confirms that A2 is indeed another image of a single background galaxy. Publ…