Search Publications
X-ray and UV observations of nova V598 Puppis between 147 and 255 days after outburst
Read, A. M.; Ness, J. -U.; Osborne, J. P. +6 more
Aims: The launch of Swift has allowed many more novae to be observed regularly over the X-ray band. Such X-ray observations of novae can reveal ejecta shocks and the nuclear burning white dwarf, allowing estimates to be made of the ejecta velocity.
Methods: We analyse XMM-Newton and Swift X-ray and UV observations of the nova V598 Pup, which w…
A method for the treatment of supergranulation advection by giant cells
Cuntz, M.; Williams, P. E.
Aims: We present a new method for the treatment of the advection of solar supergranulation by giant cells, a large-scale analogue to the observed property of granule advection by supergranules.
Methods: The proposed method is derived from a description of solar convection via spherical harmonics and spectral coefficients, allowing the investig…
The radial dependence of temperature and iron abundance. Galaxy clusters from z = 0.14 to z = 0.89
Ehlert, S.; Ulmer, M. P.
Context: The origin and evolution of the intracluster medium (ICM) are still not fully understood. A better understanding is not only interesting in its own right, but it is also important for modeling hierarchical structure growth and for using cluster surveys to determine cosmological parameters.
Aims: To determine if there exists any eviden…
Soft gamma-ray sources detected by INTEGRAL
Strong, A.; Beckmann, V.; Halloin, H. +1 more
Aims: We aim to exploit the available INTEGRAL/SPI data to provide time-averaged spectra of the brightest soft gamma-ray sources.
Methods: Employing a maximum-likelihood fit technique for our SPI data analysis, we take as input to our source model the source catalog derived by Bouchet et al. (2008) from a SPI all-sky study. We use the first fo…
XMMSL1 J060636.2-694933: an XMM-Newton slew discovery and Swift/Magellan follow up of a new classical nova in the LMC
Read, A. M.; Esquej, P.; Freyberg, M. J. +7 more
Aims: In order to discover new X-ray transients, the data taken by XMM-Newton as it slews between targets are being processed and cross-correlated with other X-ray observations.
Methods: A bright source, XMMSL1 J060636.2-694933, was detected on 18 July 2006 at a position where no previous X-ray source had been seen. The XMM-Newton slew data, p…
A new spectroscopic and interferometric study of the young stellar object V645 Cygni
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +14 more
Aims: We present the results of high-resolution optical spectroscopy, low-resolution near-IR spectroscopy and near-infrared speckle interferometry of the massive young stellar object candidate V645 Cyg, acquired to refine its fundamental parameters and the properties of its circumstellar envelope.
Methods: Speckle interferometry in the H- and …
Spectroscopic binaries among Hipparcos M giants. II. Binary frequency
Jorissen, A.; Udry, S.; Famaey, B. +3 more
Context: This paper is the second in a series devoted to studying the properties of binaries with M giant primaries.
Aims: The binary frequency of field M giants is derived and compared with the binary fraction of K giants.
Methods: Diagrams of the CORAVEL spectroscopic parameter Sb (measuring the average line width) vs. radial-velocity st…
Relationship between the topological skeleton, current concentrations, and 3D magnetic reconnection sites in the solar atmosphere
Priest, E. R.; Maclean, R. C.; Büchner, J.
Aims: The aim of this work is to determine the relationship between the 3D structure of the coronal magnetic field, diagnosed by the topological skeleton, and current concentrations as potential sites of 3D reconnection.
Methods: We utilised the results of 3D numerical MHD simulations of an observed EUV bright point (BP) in the solar atmospher…
Magnetic helicity and active filament configuration
Poedts, S.; Romano, P.; Zuccarello, F. P. +2 more
Context: The role of magnetic helicity in active filament formation and destabilization is still under debate.
Aims: Although active filaments usually show a sigmoid shape and a twisted configuration before and during their eruption, it is unclear which mechanism leads to these topologies. In order to provide an observational contribution to c…
HST observations of the nebula around the central compact object in the Vela Jr. supernova remnant
de Luca, A.; Pellizzoni, A.; Mignani, R. P.
Context: A handful of young (a few thousand years) supernova remnants (SNRs) host point-like X-ray sources, dubbed central compact objects (CCOs), which are thought to be radio-silent isolated neutron stars formed by the supernova explosion. So far, no CCO has been firmly detected at other wavelengths. However, ground-based observation in the Hα b…