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astro-ph2008★ 33 cited

Near-IR spectroscopic ages of massive star clusters in M82

A. Lançon, J. S. Gallagher, M. Mouhcine +3

Like other starburst galaxies, M82 hosts compact, massive young star clusters that are interesting both in their own right and as benchmarks for population synthesis models. Can sp…

astro-ph2008★ 15 cited

Discovery of non-radial pulsations in the spectroscopic binary Herbig Ae star RS Cha

T. Böhm, W. Zima, C. Catala +3

In this article we present a first discovery of non radial pulsations in both components of the Herbig Ae spectroscopic binary star RS Cha. The binary was monitored in quasi-contin…

astro-ph2008★ 43 cited

A multiwavelength investigation of the massive eclipsing binary Cyg OB2 #5

N. Linder, G. Rauw, J. Manfroid +5

The properties of the early-type binary Cyg OB2 #5 have been debated for many years and spectroscopic and photometric investigations yielded conflicting results. We have attempted…

astro-ph2008★ 8 cited

The rotation and coma profiles of comet C/2004 Q2 (Machholz)

Maarten Reyniers, Pieter Degroote, Dennis Bodewits +2

Aims. Rotation periods of cometary nuclei are scarce, though important when studying the nature and origin of these objects. Our aim is to derive a rotation period for the nucleus…

astro-ph2008★ 92 cited

Giants in the globular cluster omega Centauri: dust production, mass loss and distance

Iain McDonald, Jacco Th. van Loon, Leen Decin +5

We present spectral energy distribution modelling of 6875 stars in omega Centauri, obtaining stellar luminosities and temperatures by fitting literature photometry to state-of-the-…

astro-ph2008★ 32 cited

On the behaviour of stellar winds that exceed the photon-tiring limit

Allard Jan van Marle, Stanley P. Owocki, Nir J. Shaviv

Stars can produce steady-state winds through radiative driving as long as the mechanical luminosity of the wind does not exceed the radiative luminosity at its base. This upper bou…

astro-ph2008★ 27 cited

A parameter study of self-consistent disk models around Herbig AeBe stars

J. Meijer, C. Dominik, A. de Koter +3

We present a parameter study of self-consistent models of protoplanetary disks around Herbig AeBe stars. We use the code developed by Dullemond and Dominik, which solves the 2D rad…

astro-ph2008★ 1 cited

Spectral analysis of 636 white dwarf - M star binaries from the Sloan Digital Sky Survey

René Heller, Derek Homeier, Stefan Dreizler +1

We present a catalog of 857 white dwarf (WD)-M binaries from the sixth data release (DR6) of the Sloan Digital Sky Survey (SDSS), most of which were previously identified. For 636…

astro-ph2008★ 18 cited

The evolution of massive and very massive stars in clusters

Dany Vanbeveren

The present paper reviews massive star (initial mass smaller than 120 M0) and very massive star (initial mass larger than 120 M0) evolution. I will focus on evolutionary facts and…

astro-ph2008★ 37 cited

The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign

A. Baran, R. Oreiro, A. Pigulski +28

We present the results of a multisite photometric campaign on the pulsating sdB star Balloon 090100001. The star is one of the two known hybrid hot subdwarfs with both long- and sh…

astro-ph2008★ 11 cited

Time-series Spectroscopy and Photometry of the Pulsating Subdwarf B Star PG 1219+534 (KY UMa)

M. D. Reed, J. R. Eggen, S. L. Harms +7

We present observations and analysis of time-series spectroscopy and photometry of the pulsating subdwarf B star PG 1219+534 (KY UMa). Subdwarf B stars are blue horizontal branch s…

astro-ph2008★ 23 cited

Linear wave propagation in relativistic magnetohydrodynamics

R. Keppens, Z. Meliani

The properties of linear Alfvén, slow, and fast magnetoacoustic waves for uniform plasmas in relativistic magnetohydrodynamics (MHD) are discussed, augmenting the well-known expres…

astro-ph2008★ 97 cited

Evidence for CO depletion in the inner regions of gas-rich protoplanetary disks

G. van der Plas, M. E. van den Ancker, B. Acke +4

We investigate the physical properties and spatial distribution of Carbon Monoxide (CO) gas in the disks around the Herbig Ae/Be stars HD 97048 and HD 100546. Using high-spectral-r…

astro-ph2008★ 33 cited

Transverse oscillations of systems of coronal loops

M. Luna, J. Terradas, R. Oliver +1

We study the collective kinklike normal modes of a system of several cylindrical loops using the T-matrix theory. Loops that have similar kink frequencies oscillate collectively wi…

astro-ph2008★ 97 cited

The structure of the protoplanetary disk surrounding three young intermediate mass stars. II. Spatially resolved dust and gas distribution

D. Fedele, M. E. van den Ancker, B. Acke +7

[Abridged] We present the first direct comparison of the distribution of the gas, as traced by the [OI] 6300 AA emission, and the dust, as traced by the 10 micron emission, in the…

astro-ph2008★ 183 cited

Nonlinear Instability of kink oscillations due to shear motions

J. Terradas, J. Andries, M. Goossens +3

First results from a high-resolution three-dimensional nonlinear numerical study of the kink oscillation are presented. We show in detail the development of a shear instability in…

astro-ph2008★ 75 cited

SPITZER survey of dust grain processing in stable discs around binary post-AGB stars

C. Gielen, H. Van Winckel, M. Min +2

Aims: We investigate the mineralogy and dust processing in the circumbinary discs of binary post-AGB stars using high-resolution TIMMI2 and SPITZER infrared spectra. Methods: We pe…

astro-ph2008★ 104 cited

Gravitational Radiation from Primordial Helical Inverse Cascade MHD Turbulence

Tina Kahniashvili, Leonardo Campanelli, Grigol Gogoberidze +2

We consider the generation of gravitational waves by primordial helical inverse cascade magnetohydrodynamic (MHD) turbulence produced by bubble collisions at the electroweak phase…

astro-ph2008★ 47 cited

A seismic approach to testing different formation channels of subdwarf B stars

Haili Hu, M. -A. Dupret, C. Aerts +5

There are many unknowns in the formation of subdwarf B stars. Different formation channels are considered to be possible and to lead to a variety of helium-burning subdwarfs. All s…

astro-ph2008★ 30 cited

Faranoff-Riley type I jet deceleration at density discontinuities "Relativistic hydrodynamics with realistic equation of state"

Z. Meliani, R. Keppens, B. Giacomazzo

The deceleration mechanisms for relativistic jets in active galactic nuclei remain an open question, and in this paper we propose a model which could explain sudden jet deceleratio…

astro-ph2008★ 26 cited

Spatially resolved near-infrared spectroscopy of the massive star-forming region IRAS 19410+2336

N. L. Martin-Hernandez, A. Bik, E. Puga +2

IRAS19410+2336 is a young massive star forming region with an intense outflow activity. We present here spatially resolved NIR spectroscopy which allows us to verify whether the H2…

astro-ph2008★ 158 cited

A multi-site campaign to measure solar-like oscillations in Procyon. I. Observations, Data Reduction and Slow Variations

Torben Arentoft, Hans Kjeldsen, Timothy R. Bedding +45

We have carried out a multi-site campaign to measure oscillations in the F5 star Procyon A. We obtained high-precision velocity observations over more than three weeks with eleven…

astro-ph2008★ 21 cited

A Spectroscopic and Photometric Study of the Metal-Poor, Pulsating, Post-AGB Binary HD 46703

Bruce J. Hrivnak, Hans Van Winckel, Maarten Reyniers +3

The metal-poor post-AGB star HD 46703 is shown to be a single-line spectroscopic binary with a period of 600 days, a high velocity of -94 km/s, and an orbital eccentricity of 0.3.…

astro-ph2008★ 17 cited

Optical configuration and analysis of the AMBER/VLTI instrument

S. Robbe-Dubois, S. Lagarde, R. G. Petrov +23

This paper describes the design goals and engineering efforts that led to the realization of AMBER (Astronomical Multi BEam combineR) and to the achievement of its present performa…