881 citations · 29.1k across the 1.2k of their papers we have counts for
335 papers · 1 filter
Radiative transfer in black hole systems
Kinwah Wu, Warrick Ball, Steven V. Fuerst
We present a convariant formulation for radiative transfer in curved space time and demonstrate some applications in the black-hole systems. We calculate the emission from semi-tra…
VLT/FORS1 spectrophotometry of the first planetary nebula discovered in the Phoenix dwarf galaxy
Ivo Saviane, Katrina Exter, Yiannis Tsamis +2
Context: A planetary nebula (PN) candidate was discovered during FORS imaging of the Local Group dwarf galaxy Phoenix. Aims: Use this PN to complement abundances from red-giant sta…
The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating stars
M. Pignatari, R. Gallino, G. Meynet +3
The goal of this paper is to analyze the impact of a primary neutron source on the s-process nucleosynthesis in massive stars at halo metallicity. Recent stellar models including r…
The Discovery of Stellar Oscillations in the K Giant Dra
Mathias Zechmeister, Sabine Reffert, Artie P. Hatzes +2
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…
Swift Observations of Shock Evolution in RS Ophiuchi
M. F. Bode, J. P. Osborne, K. L. Page +11
Our \textit{Swift} observations of RS Oph form an unprecedented X-ray dataset to undertake investigations of both the central source and the interaction of the outburst ejecta with…
Extragalactic Classical Nova Surveys
M. J. Darnley, D. T. R. Black, M. F. Bode +5
We are currently involved in a multifaceted campaign to study extragalactic classical novae in the Local Group and beyond. Here we report on-going results from the exploitation of…
The nature of the methanol maser ring G23.657-00.127
A. Bartkiewicz, A. Brunthaler, M. Szymczak +2
Methanol masers are associated with young high-mass stars and are an important tool for investigating the process of massive star formation. The recently discovered methanol maser…
Hubble Space Telescope Imaging of the Expanding Nebular Remnant of the 2006 Outburst of RS Ophiuchi
D. J. Harman, M. F. Bode, M. J. Darnley +7
We report {\it Hubble Space Telescope} imaging obtained 155 days and 449 days after the 2006 outburst of RS Ophiuchi. Both epochs show evidence of extended emission, consistent wit…
Multi-telescope timing of PSR J1518+4904
G. H. Janssen, B. W. Stappers, M. Kramer +5
PSR J1518+4904 is one of only 9 known double neutron star systems. These systems are highly valuable for measuring the masses of neutron stars, measuring the effects of gravity, an…
Measurements of cosmic-ray secondary nuclei at high energies with the first flight of the CREAM balloon-borne experiment
H. S. Ahn, P. S. Allison, M. G. Bagliesi +34
We present new measurements of heavy cosmic-ray nuclei at high energies per- formed during the first flight of the balloon-borne cosmic-ray experiment CREAM (Cosmic-Ray Energetics…
SMC in space and time: a project to study the evolution of the prototype interacting late-type dwarf galaxy
M. Tosi, J. Gallagher, E. Sabbi +13
We introduce the SMC in space and time, a large coordinated space and ground-based program to study star formation processes and history, as well as variable stars, structure, kine…
The solar chromosphere at high resolution with IBIS. II. Acoustic shocks in the quiet internetwork and the role of magnetic fields
A. Vecchio, G. Cauzzi, K. P. Reardon
(Abridged) Aims: We characterize the dynamics of the quiet inter-network chromosphere by studying the occurrence of acoustic shocks and their relation with the concomitant photosph…
Dynamical Feedback of Self-generated Magnetic Fields in Cosmic Ray Modified Shocks
D. Caprioli, P. Blasi, E. Amato +1
We present a semi-analytical kinetic calculation of the process of non-linear diffusive shock acceleration (NLDSA) which includes the magnetic field amplification due to cosmic ray…
Luminosity-Metallicity Relation for dIrr Galaxies in the Near-Infrared
Ivo Saviane, Valentin D. Ivanov, Enrico V. Held +4
(abridged) The present work is a first step to collect homogeneous abundances and near-infrared (NIR) luminosities for a sample of dwarf irregular (dIrr) galaxies, located in nearb…
Non-LTE Spectral Analysis of Extremely Hot Post-AGB Stars: Constraints for Evolutionary Theory
Thomas Rauch, Klaus Werner, Marc Ziegler +2
Spectral analysis by means of Non-LTE model-atmosphere techniques has arrived at a high level of sophistication: fully line-blanketed model atmospheres which consider opacities of…
Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
D. J. Pinfield, B. Burningham, M. Tamura +32
We present the discovery of fifteen new T2.5-T7.5 dwarfs (with estimated distances between ~24-93pc, identified in the first three main data releases of the UKIRT Infrared Deep Sky…
Orbital periods of cataclysmic variables identified by the SDSS. IV. SDSS J220553.98+115553.7 has stopped pulsating
John Southworth, D W Townsley, B T Gaensicke
We present time-series VLT spectroscopy and NTT photometry of the cataclysmic variable SDSS J220553.98+115553.7, which contains a pulsating white dwarf. We determine a spectroscopi…
Numerical simulations of rotating axisymmetric sunspots
G. J. J. Botha, F. H. Busse, N. E. Hurlburt +1
A numerical model of axisymmetric convection in the presence of a vertical magnetic flux bundle and rotation about the axis is presented. The model contains a compressible plasma d…
Cluster AgeS Experiment (CASE): Deficiency of observed dwarf novae in globular clusters
P. Pietrukowicz, J. Kaluzny, A. Schwarzenberg-Czerny +4
We present the results of a search for dwarf novae (DNe) in globular clusters (GCs). It is based on the largest available homogeneous sample of observations, in terms of the time s…
Interaction of Close-in Planets with the Magnetosphere of their Host Stars I: Diffusion, Ohmic Dissipation of Time Dependent Field, Planetary Inflation, and Mass Loss
Randy O. Laine, Douglas N. C. Lin, Shawfeng Dong
The unanticipated discovery of the first close-in planet around 51 Peg has rekindled the notion that shortly after their formation outside the snow line, some planets may have migr…
Deep optical spectroscopy of extended Lyman alpha emission around three radio-quiet z=4.5 quasars
F. Courbin, P. North, A. Eigenbrod +1
We report the first results of a spectroscopic search for Lyman alpha, envelopes around three z=4.5 radio-quiet quasars. Our observational strategy uses the FORS2 spectrograph atta…
Metal abundances at z<1.5: new measurements in sub-Damped Lyman-alpha Absorbers
C. Peroux, J. D. Meiring, V. P. Kulkarni +4
Damped Lyman-alpha systems (DLAs) and sub-DLAs seen toward background quasars provide the most detailed probes of elemental abundances. Somewhat paradoxically these measurements ar…
RACE-OC Project: Rotation and variability in the open cluster NGC2099 (M37)
S. Messina, E. Distefano, Padmakar Parihar +4
Rotation and solar-type magnetic activity are closely related to each other in stars of G or later spectral types. Presence and level of magnetic activity depend on star's rotation…
Variability in the cycle length of the supersoft source RX J0513.9-6951
V. Burwitz, K. Reinsch, J. Greiner +4
The supersoft X-ray binary RX J0513.9-6951 shows cyclic changes between optical-low / X-ray-on states and optical-high / X-ray-off states. It is supposed to be accreting close to t…