Search Publications
Confirmation of the binary status of Chamaeleon Hα 2 - a very young low-mass binary in Chamaeleon
Neuhäuser, R.; Schmidt, T. O. B.; Vogt, N. +3 more
Context: Neuhäuser & Comerón (1998, Science, 282, 83; 1999, A&A, 350, 612) presented direct imaging evidence, as well as first spectra, of several young stellar and sub-stellar M6- to M8-type objects in the Cha I dark cloud. One of these objects is Cha Hα 2, classified as brown dwarf candidate in several publications and suggested as possi…
XMM-Newton X-ray and optical monitor far UV observations of NGC 7070A and ESO 2400100 shell galaxies
Marino, A.; Trinchieri, G.; Rampazzo, R. +3 more
Context: Shell galaxies are considered to be the debris of recent accretion/merging episodes. Their high frequency in low density environments suggests that these episodes could drive the secular evolution of at least some fraction of the early-type galaxy population.
Aims: We present XMM-Newton X-ray observations of two shell galaxies, NGC 70…
In situ spectroscopy of the solar corona
Li, B.; Fineschi, S.; Habbal, S. R. +1 more
Context: Future spacecraft missions, such as the proposed Solar Probe mission, will venture close to the Sun, allowing spectrometers measuring emission from heavy ions or neutrals in the solar wind to have radial lines of sight (LOS) pointing away from the Sun, or indeed in any direction other than sunwards.
Aims: We show that a radial LOS giv…
Modeling of C IV pumped fluorescence of Fe II in symbiotic stars
Nilsson, H.; Long, K. S.; Eriksson, M. +1 more
Aims:We describe how the C IV λ1548.18 line pumps the 1548.20 and 1548.41 Å channels of Fe II in symbiotic stars through the process known as photo-ionization by accidental resonance (PAR). We describe where and why Fe II fluorescence arises in symbiotic stars and whether the Fe II λ1548.41 channel can only be activated when there is a white-dwarf…
Investigation of CME dynamics in the LASCO field of view
Cho, K. -S.; Moon, Y. -J.; Shanmugaraju, A. +2 more
Context: The speed-distance profile of CMEs is important for understanding the propagation of CMEs.
Aims: Our main aim is to study the initial speed of CMEs in the LASCO field of view and its role in subsequent CME propagation using the acceleration-speed profile. The secondary aim is to obtain the speed growth rate.
Methods: We considered…
Deep surface photometry of edge-on spirals in Abell galaxy clusters. Constraining environmental effects
Santiago, B. X.; Vale, T. B.
Context: There is a clear scarcity of structural parameters for stellar thick discs, especially for spiral galaxies located in high-density regions, such as galaxy clusters and compact groups.
Aims: We have modelled the thin and thick discs of 4 edge-on spirals located in Abell clusters: NGC 705, ESO 243G49, ESO 187G19, LCSBS 0496P. Deep I ban…
Are there Kronian electrons in the inner heliosphere?
Fichtner, H.; Lange, D.
Context: As the largest in our solar system the Jovian magnetosphere is treated in the literature as the dominant source of a few-MeV electrons, which have been measured by various spacecraft. In particular, observations obtained with Ulysses have significantly broadened the available data base.
Aims: We simulated the transports of MeV electro…
On the Doppler navigation of a small body orbiter: Rosetta
Mysen, E.; Aksnes, K.
In 2014 the ESA probe Rosetta is to rendezvous with short-period comet 67P/Churyumov-Gerasimenko, where it will be inserted into a stable bound orbit. Partly by measuring the Doppler displacements of the probe's radio carrier waves, the gravity field of the comet's nucleus will be found. In this work, navigation strategies are developed, and impor…
XMMU J134736.6+173403: an eclipsing LMXB in quiescence or a peculiar AGN?
Altieri, B.; King, A. R.; Nucita, A. +2 more
Aims:We report the discovery of a peculiar object observed serendipitously with XMM-Newton. We present its timing and spectral properties and investigate its optical counterpart.
Methods: The light curve of the X-ray source, its spectrum, and the spectrum of the best optical counterpart are presented and analyzed.
Results: The X-ray flux d…
A solar eruption triggered by merge interactions of different helicity loops
Shen, F.; Song, W.; Feng, X.
Aims: We investigate the magnetic evolution of a flare/CME source region to determine the trigger of the flare and the EUV brightening event. Also, we discuss the role of the current helicity (h_c) in solar activity.
Methods: We use the long duration sequences of SOHO/MDI magnetograms and TRACE 195 Å images for a super active region (AR), NOAA…