Cooling of Dense Gas by H2O Line Emission and an Assessment of its Effects in Chondrule-Forming ShocksWe consider gas at densities appropriate to protoplanetary disks and calculate its ability to cool due to line radiation emitted by H2O molecules within the gas. Our work follows that of Neufeld &…M. A. Morris, S. J. Desch, F. J. Ciesla·Sep 29, 2008SaveLearn
The formation of brown dwarfs and low-mass stars by disc fragmentationWe suggest that a high proportion of brown dwarfs are formed by gravitational fragmentation of massive, extended discs around Sun-like stars. We argue that such discs should arise frequently, but…Dimitris Stamatellos, Anthony P. Whitworth·Sep 29, 2008SaveLearn
VV Pup in a low state: secondary-star irradiation or stellar activity?Aims. Emission lines in polars show complex profiles with multiple components that are typically ascribed to the accretion stream, threading region, accretion spot, and the irradiated secondary-star.…Elena Mason, Steve B. Howell, Travis Barman et al.·Sep 29, 2008SaveLearn
3-D Radiative Transfer Modelling of Massive-Star UV Wind Line VariabilityWe present detailed semi-empiric models for rotational modulations observed in ultraviolet wind lines of B0.5 supergiant HD 64760. We model the Rotational Modulation Regions (RMRs) with advanced 3-D…A. Lobel·Sep 29, 2008SaveLearn
Dust processing in photodissociation regions - Mid-IR emission modellingMid-infrared spectroscopy of dense illuminated ridges (or photodissociation regions, PDRs) suggests dust evolution. Such evolution must be reflected in the gas physical properties through processes…M. Compiegne, A. Abergel, L. Verstraete et al.·Sep 29, 2008SaveLearn
Towards an accurate model for the Antennae GalaxiesIn the framework of hierarchical structure formation ellipticals can form from merging of smaller disk galaxies. The nearby interacting 'Antennae' galaxy pair (NGC 4038/39) is one of the…Simon J. Karl, Thorsten Naab, Peter H. Johansson et al.·Sep 29, 2008SaveLearn
5 years of survey on the Crab Nebula with SPI/INTEGRALWe present observations of the Crab Nebula above 20 keV by the SPI/INTEGRAL telescope during more than 5 years of operations. Our study demonstrates the stability of the instrument with time and…E. Jourdain, J. P. Roques·Sep 29, 2008SaveLearn
Ground-based observations of O and B starsGround-based observations are a strong tool for asteroseismic studies and even in the era of asteroseismic space missions they continue to play an important role. I will report on the activities of…Katrien Uytterhoeven·Sep 29, 2008SaveLearn
LIINUS/SERPIL: a design study for interferometric imaging spectroscopy at the LBTWe present two design concepts and the science drivers of a proposed near-infrared interferometric integral field spectrograph for the LBT. This instrument will expand the capabilities of the…F. Mueller Sanchez, C. Gal, F. Eisenhauer et al.·Sep 29, 2008SaveLearn
The night-sky at the Calar Alto Observatory II: The sky at the near infraredWe present here the characterization of the night sky-brightness at the near-infrared, the telescope seeing, and the fraction of useful time at the Calar Alto observatory. For this study we have…S. F. Sanchez, U. Thiele, J. Aceituno et al.·Sep 29, 2008SaveLearn
A new interesting source in Chandra field: a pulsar wind nebula?We report the detection of a point source CXO J172337.5-373442 in a Chandra field with a high significance (26.7 sigma), and the discovery (4 sigma) of a 48" long X-ray tail emanating from the…Sudip Bhattacharyya·Sep 29, 2008SaveLearn
DNS of the kappa-mechanismWe present a purely-radiative hydrodynamic model of the kappa-mechanism that sustains radial oscillations in Cepheid variables. We determine the physical conditions favourable for the kappa-mechanism…T. Gastine, B. Dintrans·Sep 29, 2008SaveLearn
Near-Infrared Polarimetry toward the Galactic CenterNear-infrared polarimetry of point sources reveals the presence of a toroidal magnetic field in the central 20' x 20' region of our Galaxy. Comparing the Stokes parameters between high…Shogo Nishiyama, Motohide Tamura, Hirofumi Hatano et al.·Sep 29, 2008SaveLearn
Molecular gas streamers feeding and obscuring the active nucleus of NGC1068We report the first direct observations of neutral, molecular gas streaming in the nucleus of NGC1068 on scales of <30 pc using SINFONI near-infrared integral field spectroscopy. At a resolution of…F. Mueller Sanchez, R. I. Davies, R. Genzel et al.·Sep 29, 2008SaveLearn
The first VLBI image of an Infrared-Faint Radio SourceContext: To investigate the joint evolution of active galactic nuclei and star formation in the Universe. Aims: In the 1.4 GHz survey with the Australia Telescope Compact Array of the Chandra Deep…E. Middelberg, R. P. Norris, S. Tingay et al.·Sep 29, 2008SaveLearn
A Global Energetic Model for Microquasars: preliminary results and spectral energy distributionsWe present preliminary results and observables from a model of microquasar based on a theoretical framework where stationary, powerful, compact jets are launched and then accelerated from an inner…C. Foellmi, P. -O. Petrucci, J. Ferreira et al.·Sep 29, 2008SaveLearn
Merger of Black Holes in the Galactic CenterWe present the results of three body simulations focused on understanding the fates of intermediate mass black holes (IBH) that drift within the central 0.5 pc of the Galaxy. In particular, we…F. Elliott Koch, Bradley M. S. Hansen·Sep 29, 2008SaveLearn
Propagation of nonadiabatic magnetoacoustic waves in a threaded prominence with mass flowsHigh resolution observations of solar filaments suggest the presence of groups of prominence threads, i.e. the fine-structures of prominences, which oscillate coherently (in phase). In addition, mass…R. Soler, R. Oliver, J. L. Ballester·Sep 29, 2008SaveLearn
The diverse broad-band light-curves of Swift GRBs reproduced with the cannonball modelTwo radiation mechanisms, inverse Compton scattering (ICS) and synchrotron radiation (SR), suffice within the cannonball (CB) model of long gamma ray bursts (LGRBs) and X-ray flashes (XRFs) to…Shlomo Dado, Arnon Dar, A. De Rujula·Sep 28, 2008SaveLearn
ADONIS high contrast infrared imaging of Sirius-BSirius is the brightest star in the sky and a strong source of diffuse light for modern telescopes so that the immediate surroundings of the star are still poorly known. We study the close…Jean-Marc Bonnet-Bidaud, Eric Pantin·Sep 28, 2008SaveLearn
The Discovery of Stellar Oscillations in the K Giant ι Draι Dra (HIP 75458) is a well-known example for a K giant hosting a substellar companion since its discovery by Frink et al. (2002). We present radial velocity measurements of this star from…Mathias Zechmeister, Sabine Reffert, Artie P. Hatzes et al.·Sep 28, 2008SaveLearn
Spectral evidence for jets from Accreting Millisecond X-ray PulsarsTransient radio emission from X-ray binaries is associated with synchrotron emission from collimated jets that escape the system, and accreting millisecond X-ray pulsars (AMXPs) are no exception.…David M. Russell, Rob P. Fender, Peter Jonker et al.·Sep 28, 2008SaveLearn
Quark-nova remnants IV: Application to radio emitting AXP transients(Abridged) XTE J1810-197 and 1E 1547.0-5408 are two transient AXPs exhibiting radio emission with unusual properties. In addition, their spin down rates during outburst show opposite trends, which so…Rachid Ouyed, Denis Leahy, Brian Niebergal·Sep 27, 2008SaveLearn
The Accuracy of Supermassive Black Hole Masses Determined by the Single-Epoch-Spectrum (Dibai) MethodThe first set of supermassive black hole mass estimates, published from 1980 to 1984 by E. A. Dibai, are shown to be in excellent agreement with recent reverberation-mapping estimates. Comparison of…Nikolai G. Bochkarev, C. Martin Gaskell·Sep 27, 2008SaveLearn
Mass loss and evolution of hot massive starsWe discuss the role of mass loss for the evolution of the most massive stars, highlighting the role of the predicted bi-stability jump that might be relevant for the evolution of rotational…Jorick S. Vink·Sep 27, 2008SaveLearn