Search Publications
Search for signatures of dust in the Pluto-Charon system using Herschel/PACS observations
Lellouch, E.; Balog, Z.; Marton, G. +3 more
In this letter we explore the environment of Pluto and Charon in the far infrared with the main aim of identifying the signs of any possible dust ring, should it exist in the system. Our study is based on observations performed at 70 µm with the PACS instrument onboard the Herschel Space Observatory at nine epochs between March 14 and 19, 20…
The prospective search for highly ionized technetium in hot (pre-) white dwarfs
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
The discovery of technetium (Tc) in the atmospheres of red giants by Merrill (1952, ApJ, 116, 21) constituted convincing proof that s-process nucleosynthesis is indeed occurring in evolved stars. In principle, Tc should still be present in the atmospheres of hot post-AGB stars and (pre-) white dwarfs although, due to radioactive decay, it should b…
Period change of massive binaries from combined photometric and spectroscopic data in Cygnus OB2
Tuvikene, Taavi; Tempel, Elmo; Eenmäe, Tõnis +2 more
Context. Mass loss is an important property in evolution models of massive stars. As up to 90% of the massive stars have a visual or spectroscopic companion and many of them exhibit mass exchange, mass-loss rates can be acquired through studying the period of massive binaries.
Aims: Using our own photometric observations as well as archival d…
Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14
Götz, D.; Mereghetti, S.; Santangelo, A. +1 more
We exploited the high sensitivity of the INTEGRAL IBIS/ISGRI instrument to study the persistent hard X-ray emission of the soft gamma-ray repeater SGR 1900+14, based on ~11.6 Ms of archival data. The 22-150 keV INTEGRAL spectrum can be well fitted by a power law with photon index 1.9 ± 0.3 and flux Fx = (1.11 ± 0.17) × 10-11 …
An X-ray characterization of the central region of the supernova remnant G332.5-5.6
Miceli, M.; Combi, J. A.; García, F. +3 more
Aims: We present an X-ray analysis of the central region of supernova remnant (SNR) G332.5-5.6 through an exhaustive analysis of XMM-Netwon observations with complementary infrared observations. We characterize and discuss the origin of the observed X-ray morphology, which presents a peculiar plane edge over the west side of the central regio…
A coronal wave and an asymmetric eruptive filament in SUMER, CDS, EIT, and TRACE co-observations
Doyle, J. G.; Madjarska, M. S.; Shetye, J.
Context. The investigation covers the complex subject of coronal waves and the phenomena contributing to and/or causing their formation.
Aims: The objectives of the present study is to provide a better physical understanding of the complex inter-relation and evolution of several solar coronal features comprising a double-peak flare, a coronal…
Solar extreme ultraviolet variability of the quiet Sun
Solanki, S. K.; Teriaca, L.; Shakeri, F.
The last solar minimum has been unusually quiet compared to the previous minima (since space-based radiometric measurements are available). The Sun's magnetic flux was substantially lower during this minimum. Some studies also show that the total solar irradiance during the minimum after cycle 23 may have dropped below the values known from the tw…
XMM-Newton RGS observations of the Cat's Eye Nebula
Gruendl, R. A.; Chu, Y. -H.; Guerrero, M. A. +1 more
We present an analysis of XMM-Newton Reflection Grating Spectrometer (RGS) observations of the planetary nebula (PN) NGC 6543. These observations render it the second PN with high-resolution X-ray spectroscopic observations after BD +30°3639. The observations consist of 26 pointings, 14 of which included RGS observations for a total integration ti…
Environmental dependence of polycyclic aromatic hydrocarbon emission at z ~ 0.8. Investigation by observing RX J0152.7-1357 with AKARI
Koyama, Yusei; Kodama, Tadayuki; Matsuhara, Hideo +2 more
We study the environmental dependence of the strength of polycyclic aromatic hydrocarbon (PAH) emission using AKARI observations of RX J0152.7-1357, a galaxy cluster at z = 0.84. PAH emission reflects the physical conditions of galaxies and dominates 8 µm luminosity (L8), which can be directly measured with the L15 band of AKARI. The ratio o…
Astrometric observations of Phobos with the SRC on Mars Express. New data and comparison of different measurement techniques
Oberst, J.; Hoffmann, H.; Willner, K. +7 more
Aims: From April 2008 to August 2011 Mars Express carried out 74 Phobos flybys at distances between 669 and 5579 km. Images taken with the Super Resolution Channel (SRC) were used to determine the spacecraft-centered right ascension and declination of this Martian moon.
Methods: Image positions of Phobos were measured using the limb-fit …