Search Publications
Links between magnetic fields and plasma flows in a coronal hole
Marsch, E.; Xia, L. D.; Wiegelmann, T.
We compare the small-scale features visible in the Ne viii Doppler-shift map of an equatorial coronal hole (CH) as observed by SUMER with the small-scale structures of the magnetic field as constructed from a simultaneous photospheric magnetogram by a potential magnetic-field extrapolation. The combined data set is analysed with respect to the sma…
A study of bright Southern long period variables
Lebzelter, T.; Hinkle, K. H.; Wood, P. R. +2 more
In this paper we present radial velocity curves of AGB variables that exhibit various kinds of anomalies: semiregular variables (SRVs) with typical mira periods, SRVs exceeding the mira 2.5 mag amplitude limit, miras with secondary maxima in their light curves, and a SRV with a long secondary period. The stars with reliable Hipparcos parallaxes fr…
HST/WFPC2 morphologies and bar structures of field galaxies at 0.4 < z < 1
Flores, H.; Hammer, F.; Assémat, F. +2 more
To address how the galaxy Hubble sequence is established and what physical processes are involved, we studied morphological properties and internal structures of field galaxies in the past (0.4<z<1). In addition to structural parameters derived from bulge+disk decomposition, Zheng et al. (2004, A&A, 421, 847) introduced color maps in rec…
An ISOCAM survey through gravitationally lensing galaxy clusters. IV. Luminous infrared galaxies in Cl 0024+1654 and the dynamical status of clusters
Kneib, J. -P.; Altieri, B.; Miville-Deschênes, M. -A. +9 more
Observations of the core of the massive cluster
On the effect of the background wind on the evolution of interplanetary shock waves
Poedts, S.; Chané, E.; Jacobs, C. +1 more
The propagating shock waves in the solar corona and interplanetary (IP) space caused by fast Coronal Mass Ejections (CMEs) are simulated numerically and their structure and evolution is studied in the framework of ideal magnetohydrodynamics (MHD). Due to the presence of three characteristic velocities and the anisotropy induced by the magnetic fie…
Fiber bursts as 3D coronal magnetic field probe in postflare loops
Mann, G.; Aurass, H.; Rausche, G. +1 more
Fiber bursts appear in some complex solar radio bursts as a continuum fine structure in the frequency range of 150\cdots3000 MHz. We present and test a new method to use fiber bursts as a probe of the magnetic field strength and the 3D field structure in postflare loops. Thereby we assume that fiber bursts are driven by whistler waves ascending in…
On the origin of microwave zebra pattern
Kuznetsov, A. A.; Yan, Yihua; Altyntsev, A. T. +2 more
The results of the first observations of a zebra pattern at frequencies around5.6GHz are presented. The fine structures in the emission spectrum were recorded simultaneously by the Siberian Solar Radiotelescope and the spectropolarimeters of the National Astronomical Observatories, which allowed us to study the presented event with high spatial, t…
Highly ionized gas in the local ISM: Some like it hot?
Lallement, R.; Welsh, B. Y.
We present HST-STIS medium-resolution spectra (R ∼ 6.5 km s-1) of the ultraviolet interstellar absorption lines observed towards 4 early-type stars located within the local interstellar medium (ISM), with sight-line distances <186 pc in the general direction of the Loop I superbubble (l = 330°, b = +18°). These data have been supplem…
An XMM-Newton look at the Wolf-Rayet star WR 40. The star itself, its nebula and its neighbours
Gosset, E.; Nazé, Y.; Rauw, G. +3 more
We present the results of an XMM-Newton observation of the field of the Wolf-Rayet star WR 40. Despite a nominal exposure of 20 ks and the high sensitivity of the satellite, the star itself is not detected: we thus derive an upper limit on its X-ray flux and luminosity. Joining this result to recent reports of a non-detection of some WC stars, we …
The proper motion of the isolated neutron star RX J1605.3+3249
Haberl, F.; Motch, C.; Schwope, A. +3 more
We obtained deep optical imaging of the thermally emitting X-ray bright and radio-quiet isolated neutron star