Search Publications
SUMER observations of the inverse Evershed effect in the transition region above a sunspot
Solanki, S. K.; Curdt, W.; Teriaca, L.
Aims: We analyse SUMER spectral scans of a large sunspot within active region NOAA 10923, obtained on 14-15 November 2006, to determine the morphology and dynamics of the sunspot atmosphere at different heights/temperatures.
Methods: The data analysed here consist of spectroheliograms in the continuum around 142.0 nm and in the Si iv 140.2 nm,…
Different triggering mechanisms for solar flares and coronal mass ejections
Lippiello, E.; de Arcangelis, L.; Godano, C.
Context: Experimental observations indicate that flares and CMEs are often associated, even if the precise relationship between the two phenomena is a still hot and open question.
Aims: We present a study of the statistical properties of solar flare and CME temporal organisation, in order to enlighten differences in the mechanisms at the basis…
Correcting for background changes in CoRoT exoplanet data
Auvergne, M.; Costa, J. E. S.; Samadi, R. +4 more
Context: The CoRoT satellite is a highly accurate photometer with 2 channels respectively optimised for asteroseismology and exoplanet finding. The design includes an effective straylight rejection system, however residual straylight reaches the detectors.
Aims: We test four different background models in order to apply the best possible backg…
Imaging the heliosheath using HSTOF energetic neutral atoms and Voyager 1 ion data
Hsieh, K. C.; Hilchenbach, M.; Czechowski, A. +2 more
Context: Voyager 1 and 2 LECP instruments measure the distributions of the heliosheath ions of energies ≥40 keV. This threshold energy is an order of magnitude higher than the maximum energy (6 keV) of the energetic neutral atoms (ENA) to be measured by the forthcoming IBEX mission. On the other hand, the energy range of SOHO/CELIAS/HSTOF ENA meas…
Magnetic topology of blinkers
Doyle, J. G.; Madjarska, M. S.; Maclean, R. C. +2 more
Context: Co-spatial and co-temporal spectroscopic, imaging and magnetogram data enable us to better understand various solar transient phenomena. Here, we study brightening events in the transition region of the quiet Sun, also called “blinkers”.
Aims: We aim to investigate the physical mechanism responsible for blinkers.
Methods: An autom…
An infrared-submillimeter study of starforming regions selected by the ISOSS 170 µm survey
Krause, O.; Birkmann, S. M.; Lemke, D. +1 more
Context: Using the ISOPHOT Serendipity Survey (ISOSS) at 170 µm, a sample of galactic starforming regions has been established that exhibits very cold dust temperatures (< 20 K) and high masses (> 100 M_⊙).
Aims: We characterize the starforming content of five regions that were selected as potential sites of high-mass star formatio…
Cluster geometry and inclinations from deprojection uncertainties. Cluster geometry and inclination
Chakrabarty, D.; Russell, H.; de Filippis, E.
Context: The determination of cluster masses is a complex problem that would be aided by information about the cluster shape and orientation (with respect to the line-of-sight).
Aims: It is in this context, that we have developed a scheme for identifying the intrinsic morphology and inclination of a cluster, by looking for the signature of the…
Discovery of thermal X-ray emission in the supernova remnant G337.8-0.1 (Kes 41)
Combi, J. A.; Martí, J.; Albacete-Colombo, J. F.
Aims: We report here on the first detection at X-ray wavelengths of the Supernova Remnant (SNR) G337.8-0.1, carried out with the XMM-Newton Observatory.
Methods: Using the X-ray observations, we studied the X-ray morphology of the remnant at different energy ranges, analysed the spectral properties and investigated a possible variable behavior…
Three X-ray transients in M ;31 observed with Swift
Stiele, H.; Pietsch, W.; Haberl, F. +5 more
Aims: The purpose of this study is to find transient X-ray sources in M 31 and to investigate and classify their nature.
Methods: Three X-ray transients were observed with Swift. For each of the three X-ray transients, we used the Swift X-ray and optical data with observations from XMM-Newton and Chandra to investigate the lightcurves and the …
Discovery of a [WO] central star in the planetary nebula Th 2-A
Gamen, R.; Díaz, R. J.; Weidmann, W. A. +1 more
Context: About 2500 planetary nebulae are known in our Galaxy but only 224 have central stars with reported spectral types in the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker et al. 1992; Acker et al. 1996).
Aims: We have started an observational program aiming to increase the number of PN central stars with spectral classific…