Science Archives Publication System

X-ray confirmation of the intermediate polar HT Cam

DOI: 10.1051/0004-6361:20052761 Bibcode: 2005A&A...437..935D

Mukai, K.; Haberl, F.; Gänsicke, B. T. +6 more

We report on the first pointed X-ray observations with XMM-Newton and RXTE satellites of the X-ray source RX J0757.0+6306 = HT Cam. We detect a strong 515 s X-ray modulation confirming the optical photometric period found in 1998, which definitively assigns this source to the intermediate polar class of magnetic cataclysmic variables. The lack of …

2005 • Astronomy and Astrophysics

XMM-Newton 26

Warm flux tubes in the E-ring plasma torus: Initial Cassini magnetometer observations

DOI: 10.1029/2005GL022652 Bibcode: 2005GeoRL..3214S08L

André, N.; Russell, C. T.; Dougherty, M. K. +2 more

Initial Cassini magnetometer observations in the E-ring plasma torus reveal the presence of previously unreported diamagnetic decreases in the magnetic field. The decrease in magnetic pressure on these flux tubes implies the presence of additional plasma energy densities up to 1 keV/cm³. They are less stretched than surrounding flux tub…

2005 • Geophysical Research Letters

Cassini 26

Supernova Remnants in the Magellanic Clouds. VI. The DEM L316 Supernova Remnants

DOI: 10.1086/497681 Bibcode: 2005ApJ...635.1077W

Chu, Y. -H.; Williams, R. M.

The DEM L316 system contains two shells, both with the characteristic signatures of supernova remnants (SNRs). We analyze Chandra and XMM-Newton data for DEM L316, investigating its spatial and spectral X-ray features. Our Chandra observations resolve the structure of the northeastern SNR (shell A) as a bright inner ring and a set of ``arcs'' surr…

2005 • The Astrophysical Journal

XMM-Newton 26

Evidence for Gravitational Infall of Matter onto the Supermassive Black Hole in the Quasar PG 1211+143?

DOI: 10.1086/498568 Bibcode: 2005ApJ...633L..81R

Turner, T. J.; Uttley, P.; Kraemer, S. +5 more

We report the detection of redshifted iron Kα absorption lines in the Chandra LETG spectrum of the narrow-line quasar PG 1211+143. The absorption lines are observed at 4.22 and 4.93 keV in the quasar spectrum, corresponding to 4.56 and 5.33 keV in the rest frame of PG 1211+143. From Monte Carlo simulations, the chance probability of both lines bei…

2005 • The Astrophysical Journal

XMM-Newton 26

Energetic Electrons as a Field Line Topology Tracer in the High Latitude Boundary/CUSP Region: Cluster Rapid Observations

DOI: 10.1007/s10712-005-1879-z Bibcode: 2005SGeo...26..215Z

Balogh, A.; Daly, P. W.; Reme, H. +7 more

Energetic electrons (e.g., 50 keV) travel along field lines with a high speed of around 20 R_Es^‑1. These swift electrons trace out field lines in the magnetosphere in a rather short time, and therefore can provide nearly instantaneous information about the changes in the field configuration in regions of geospace. The energeti…

2005 • Surveys in Geophysics

Cluster 26

The young active binary star EK Draconis

DOI: 10.1051/0004-6361:20040462 Bibcode: 2005A&A...435..215K

Guenther, E. W.; Hatzes, A. P.; Woitas, J. +1 more

EK Dra (HD 129333) is a young, active, nearby star that is orbited by a low mass companion. By combining new speckle observations with old and new radial velocity measurements we find that the orbit is highly eccentric with e=0.82±0.03, and we derive the true masses of both components. The masses are 0.9±0.1 M…

2005 • Astronomy and Astrophysics

Hipparcos 25

The dM4.5e star G124-62 and its binary L dwarf companion DENIS-P J1441-0945. Common proper motion, distance, age, and masses

DOI: 10.1051/0004-6361:20041902 Bibcode: 2005A&A...440..967S

Neuhäuser, R.; Guenther, E.; Seifahrt, A.

We present astrometric and photometric measurements of the field binary L1 dwarf DENIS-P J1441-0945. Analysis of archival HST images and photometric parallax measurements give a distance of 34±7 pc and a proper motion close to that of the nearby high proper motion star G124-62. Comparison of SuperCOSMOS and 2MASS images confirms that these objects…

2005 • Astronomy and Astrophysics

eHST 25

A stochastic sea: The source of plasma sheet boundary layer ion structures observed by Cluster

DOI: 10.1029/2005JA011183 Bibcode: 2005JGRA..11012221A

Zelenyi, L. M.; El-Alaoui, M.; Walker, R. J. +4 more

On 14 February 2001 the Cluster Ion Spectrometry (CIS) experiment onboard three of the Cluster spacecraft observed velocity-dispersed ion structures (VDIS) as the spacecraft passed from the tail lobes into the plasma sheet boundary layer. These are the first multiple spacecraft observations of the VDIS phenomenon. The Cluster 1 spacecraft (SC1) ob…

2005 • Journal of Geophysical Research (Space Physics)

Cluster 25

Discovery of nitrogen in Saturn's inner magnetosphere

DOI: 10.1029/2005GL022654 Bibcode: 2005GeoRL..3214S03S

Johnson, R. E.; Sittler, E. C.; Smith, H. T. +6 more

We detected N⁺ in Saturn's magnetosphere in the range L ~ 3.5 to ~9.5 Saturn Radii (Rs) using data collected by the Cassini Plasma Spectrometer during Saturn Orbit Insertion and the following orbit (Rev A). The presence of N⁺ in Saturn's magnetosphere has been a source of much debate since Voyager's detection of unresolved ma…

2005 • Geophysical Research Letters

Cassini 25

Temporal and spatial evolution of discrete auroral arcs as seen by Cluster

DOI: 10.5194/angeo-23-2531-2005 Bibcode: 2005AnGeo..23.2531F

Nilsson, H.; Karlsson, T.; Fazakerley, A. +7 more

Two event studies are presented in this paper where intense convergent electric fields, with mapped intensities up to 1350 mV/m, are measured in the auroral upward current region by the Cluster spacecraft, at altitudes between 3 and 5 Earth radii. Both events are from May 2003, Southern Hemisphere, with equatorward crossings by the Cluster spacecr…

2005 • Annales Geophysicae

Cluster 25