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Star formation: statistical measure of the correlation between the prestellar core mass function and the stellar initial mass function
stars formation — stars luminosity function mass function — ISM clouds
2010/11/11
We present a simple statistical analysis of recent numerical simulations exploring the correlation between the core mass function obtained from the fragmentation of a molecular cloud and the stellar m...
Gemini GMOS spectroscopy of HeII nebulae in M33
stars atmospheres — stars Wolf-Rayet — ISM HII regions — ISM lines and bands — galaxies individual (M33)—galaxies
2010/11/15
We have carried out a narrow-band survey of the Local Group galaxy, M33, in the HeII λ4686 emission line, to identify HeII nebulae in this galaxy. With spectroscopic follow-up observations, we confirm...
Reaction Networks For Interstellar Chemical Modelling: Improvements and Challenges
Reaction Networks Interstellar Chemical Modelling
2010/11/11
We survey the current situation regarding chemical modelling of the synthesis of molecules in the interstellar medium. The present state of knowledge concerning the rate coecients and their uncertain...
Retrograde Accretion and Merging Supermassive Black Holes
accretion accretion discs black hole physics galaxies formation – galaxies
2010/11/12
We investigate whether a circumbinary gas disc can coalesce a supermassive black hole
binary system in the centre of a galaxy. This is known to be problematic for a prograde disc.
We show that in co...
Sigmoid-to-Flux-Rope Transition Leading to A Loop-Like Coronal Mass Ejection
Sun flares—Sun Coronal mass ejections (CMEs)—Sun filaments prominences
2010/11/11
Sigmoids are one of the most important precursor structures for solar eruptions.In this Letter, we study a sigmoid eruption on 2010 August 1 with EUV data obtained by the Atmospheric Imaging Assembly ...
Abundance anomalies in pre-main-sequence stars: Stellar evolution models with mass loss
Diffusion — stars chemically peculiar — stars mass–loss — stars pre–main-sequence — stars evolution — stars
2010/11/12
Aims. The effects of atomic diffusion on internal and surface abundances of A and F pre–main-sequence stars with mass loss are studied in order to determine at what age the effects materialize, as wel...
High-resolution spectroscopic view of planet formation sites
planetary systems protoplanetary disks hydrodynamics line pro les
2010/11/15
Theories of planet formation predict the birth of giant planets in the inner, dense, and
gas-rich regions of the circumstellar disks around young stars. These are the regions from which strong CO emi...
Modeling of the Vela complex including the Vela supernova remnant, the binary system gamma2 Velorum, and the Gum nebula
ISM supernova remnants – ISM clouds – ISM bubbles – ISM individual objects Vela SNR shock waves Stars
2010/11/11
We study the geometry and dynamics of the Vela complex including the Vela supernova remnant (SNR), the binary system γ2 Velorum and the Gum nebula. We show that the Vela SNR belongs to a subclass of n...
Over the past years observations of young and populous star clusters have shown that the stellar initial mass function (IMF) can be conveniently described by a two-part power-law with an exponent 2 =...
The Ultraviolet-X-ray connection in AGN outflows
X-ray Spectroscopy UV spectroscopy Active Galactic Nuclei absorption lines
2010/11/15
In this paper I review the recent progress in understanding the physics of the gas outflowing from active galactic nuclei and its impact on the surrounding environment, using the combined information ...
Non-axisymmetric oscillations of stratified coronal magnetic loops with elliptical cross-sections
magnetohydrodynamics(MHD) - plasmas - Sun corona - Sun oscillations - waves
2010/11/15
Aims. We study non-axisymmetric oscillations of a straight magnetic tube with an elliptic crosssection and density varying along the tube.
Old open clusters and the Galactic metallicity gradient: Berkeley 20, Berkeley 66, and Tombaugh 2
Galaxy disc – Hertzsprung-Russell (HR) diagram – open clusters and associations
2010/11/15
To study the crucial range of Galactocentric distances between 12 and 16 kpc, where little
information is available, we have obtained V I CCD imaging of Berkeley 20 and BV I CCD
imaging of Berkeley ...
Detection of the 69 μm band of crystalline forsterite in the Herschel MESS-program
crystalline forsterite Herschel MESS-program
2010/11/11
In this article we present the detection of the 69 μm band of the crystalline olivine forsterite within the MESS key program of Herschel. We determine the temperature of the forsterite grains by fitti...
Determining the forsterite abundance of the dust around AGB stars
forsterite abundance of the dust AGB stars
2010/11/11
We present a diagnostic tool to determine the forsterite abundance of the dust ejected by AGB stars. Our method is based on a comparison between the observed strength of spectral bands of forsterite a...
Propagation of the burst of radiation in expanding and recombining Universe: Thomson scattering
radiation expanding recombining Universe
2011/1/10
Within the framework of a flat cosmological model a propagation of an instantaneous burst of nonpolarized isotropic radiation is considered from the moment of its beginning at some initial redshift z0...