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Transient ion beamlet injections into spatially separated PSBL flux tubes observed by Cluster-CIS
Lundin, R.; Dandouras, I.; Klecker, B. +8 more
Ion measurements from Cluster-CIS were used to characterize and interpret the signatures of PSBL energy-dispersed ions and their fine structure. On 14 February 2001, several ion injections were encountered by SC 1 and SC 3, separated by ~530 km, during an outbound orbit at 4.5 RE. Both satellites recorded the same ion structures. The en…
Cluster observations of complex 3D magnetic structures at the magnetopause
Fedorov, A.; Budnik, E.; Balogh, A. +7 more
On June 30, 2001, around 0530 UT, Cluster was moving along the magnetopause with spacecraft on both sides of the discontinuity. The configuration was `quasi-ideal' with magnetic field and plasma flow almost aligned in the magnetosheath and nearly anti-parallel to the magnetospheric field. Cluster observed several perturbations with leading and tra…
Subgiants as probes of galactic chemical evolution
Gustafsson, B.; Edvardsson, B.; Thorén, P.
Chemical abundances for 23 candidate subgiant stars have been derived with the aim at exploring their usefulness for studies of galactic chemical evolution. High-resolution spectra from ESO CAT-CES and NOT-SOFIN covered 16 different spectral regions in the visible part of the spectrum. Some 200 different atomic and molecular spectral lines have be…
A young and complex binary star - HD 144432
de Winter, D.; van den Ancker, M. E.; Bopp, B. W. +1 more
The southern emission-line star HD 144432 has received considerable attention due to its relative brightness (V ∼ 8.17), its late spectral type (late A-type or perhaps early F) and its relative isolation from a bona-fide active star formation region. We present new imaging and spectroscopic data of this star, which in the past has been classified …
An Atlas of Far-Ultraviolet Spectra of Wolf-Rayet Stars from the FUSE Satellite
Walborn, Nolan R.; Sonneborn, George; Hutchings, John B. +5 more
We present an atlas of far-ultraviolet spectra of 21 Wolf-Rayet (WR) stars in the Galaxy and Large and Small Magellanic Clouds, secured with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite. The data cover the wavelength range of 912-1190 Å at a spectral resolution of 0.1 Å and span examples of most subtypes in the WN and WC sequences. …
Shocks and particle acceleration in supernova remnants: observational features
Vink, Jacco
The last 10 years a number of observational advances have substantially increased our knowledge of shock phenomena in supernova remnants. This progress has mainly been made possible by the recent improvements in X-ray and γ-ray instrumentation. It has become clear that some shell-type supernova remnants, e.g., SN 1006, have X-ray emission dominate…
A second glance at SN 2002ap and the M 74 field with XMM-Newton
Pian, E.; Soria, R.; Mazzali, P. A.
We have re-observed the field of M 74 in January 2003 with XMM-Newton, 11 months after the X-ray detection of SN 2002ap. From a comparison of the two XMM-Newton observations we obtain more accurate values for the X-ray luminosity and colours of the source five days after the event, and a limit on its decline rate. We compare its X-ray behaviour (p…
On the Nature of the Bright Short-Period X-Ray Source in the Circinus Galaxy Field
Wu, Kinwah; Weisskopf, Martin C.; Tennant, Allyn F. +2 more
The spectrum and light curve of the bright X-ray source CG X-1 in the field of the Circinus galaxy are reexamined. Previous analyses have concluded that the source is an accreting black hole of mass >~50 Msolar, although it has been noted that the light curve resembles that of an AM Herculis system. Here we show that the short period…
Hydrogen Lyα Intensity Oscillations Observed by the Solar and Heliospheric Observatory Ultraviolet Coronagraph Spectrometer
Li, X.; Morgan, H.; Habbal, S. Rifai
We report on a search for significant oscillations in different coronal structures by applying a wavelet analysis to Solar and Heliospheric Observatory UVCS observations of the hydrogen Lyα 1216 Å line intensity taken between 1.5 and 2.2 Rsolar. Significant periodic oscillations, unlikely to be a result of instrumental effects, are show…
Energetic magnetospheric oxygen in the magnetosheath and its response to IMF orientation: Cluster observations
Lundin, R.; Sauvaud, J. -A.; Balogh, A. +17 more
We present Cluster observations made during an outbound orbit on 10 December 2000. After exiting the magnetosphere at midlatitude, Cluster spent a long time skimming the magnetopause moving to lower latitude along an orbit approximately in the ZYGSM plane on the dusk flank of the magnetopause. During this time, magnetospheric oxygen wit…