Search Publications
Large-scale horizontal flows in the solar photosphere. V. Possible evidence for the disconnection of bipolar sunspot groups from their magnetic roots
Švanda, M.; Sobotka, M.; Klvaňa, M.
In a recent paper (Švanda et al. 2008, A&A, 477, 285) we pointed out that, based on the tracking of Doppler features in the full-disc MDI Dopplergrams, the active regions display two dynamically different regimes. We speculated that this could be a manifestation of the sudden change in the active regions dynamics, caused by the dynamic disconn…
On the morphology of the compact dust shell in the symbiotic system HM Sagittae
Chesneau, O.; Sacuto, S.
Context: The symbiotic system
Orientations of very faint galaxies in the Coma cluster
Ilbert, O.; Pelló, R.; Adami, C. +5 more
Context: Models of large scale structure formation predict the existence of preferential orientations for galaxies in clusters.
Aims: We have searched for preferential orientations of very faint galaxies in the Coma cluster (down I_Vega ∼-11.5).
Methods: By applying a deconvolution method to deep u* and I band images of the Coma…
Adapting Marchal's test of escape to real triple stars
Li, P. J.; Fu, Y. N.; Sun, Y. S.
Context: For a general N-body system, Marchal constructed an analytical test of escape, which uses only a one-dimensional projected motion state of the system at any given instant. This test is well adapted to identifying real, disintegrating small stellar systems, of which the full motion states are generally unavailable. However, to our knowledg…
Morphological and dynamical properties of small-scale chromospheric features deduced from IBIS observations
Romano, P.; Spadaro, D.; Contarino, L. +2 more
Context: In the past, chromospheric features were mostly studied by analyzing observations performed along the Hα profile, but several aspects related to their formation and dynamics remained uncertain and poorly understood. Recently, new investigations have been carried out using data obtained along the Ca II line at 854.21 nm, providing new inpu…
The physical conditions in Gomez's Hamburger (IRAS 18059-3211), a pre-MS rotating disk
Bujarrabal, V.; Young, K.; Castro-Carrizo, A.
Aims: We aim to study the structure, dynamics, and physical conditions of Gomez's Hamburger (IRAS 18059-3211; GoHam), and in particular confirm that GoHam mainly consists of a flaring disk in Keplerian rotation around a young, probably pre-MS star.
Methods: We present high resolution SMA maps of 12CO J = 2-1, 13CO J = 2-1…
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…