Search Publications
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…
SUMER-Hinode observations of microflares: excitation of molecular hydrogen
Innes, D. E.
Context: Concentrations of H2 have been detected by SUMER in active region plage. The H2 is excited by O VI line emission at 1031.94 Å which, although not observed, must be brightening along with the observed transition region line, Si III 1113.24 Å.
Aims: We investigate the excitation of H2 and demonstrate the association between the observed…
The FERRUM project: experimental and theoretical transition rates of forbidden [Sc II] lines and radiative lifetimes of metastable Sc II levels
Lundberg, H.; Hartman, H.; Hibbert, A. +6 more
Context: In many plasmas, long-lived metastable atomic levels are depopulated by collisions (quenched) before they decay radiatively. In low-density regions, however, the low collision rate may allow depopulation by electric dipole (E1) forbidden radiative transitions, so-called forbidden lines (mainly M1 and E2 transitions). If the atomic transit…
Spitzer mid-infrared study of compact H II regions in the Magellanic Clouds
Heydari-Malayeri, M.; Charmandaris, V.; Chatzopoulos, E.
Aims: We present a study of the mid-infrared properties and dust content of a sample of 27 H ii “blobs”, a rare class of compact H ii regions in the Magellanic Clouds. A unique feature of this sample is that even though these H ii regions are of high and low excitation they have nearly the same physical sizes ~1.5-3 pc.
Methods: We base our an…
The INTEGRAL long monitoring of persistent ultra compact X-ray bursters
Bird, A. J.; Fiocchi, M.; Ubertini, P. +3 more
Context: The combination of compact objects, short period variability and peculiar chemical composition of the ultra compact X-ray binaries make up a very interesting laboratory to study accretion processes and thermonuclear burning on the neutron star surface. Improved large optical telescopes and more sensitive X-ray satellites have increased th…