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Observational asteroseismology of hot subdwarf stars
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
Hot subdwarf stars are particularly challenging for asteroseismology due to their rapid pulsation periods, intrinsic faintness and relative rarity both in the field and in clusters. These features hav...
Observational approach to the chemical evolution of high-mass binaries
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
The complexity of composite spectra of close binaries makes the study of the individual stellar spectra extremely difficult. For this reason there exists very little information on the chemical compos...
The Type Ib SN 1999dn: One Year of Photometric and Spectroscopic Monitoring
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
Extensive optical and near-infrared (NIR) observations of the type Ib supernova 1999dn are presented, covering the first year after explosion. These new data turn this object, already considered a pro...
Many theoretical and laboratory studies predict H2 to be formed in highly excited ro-vibrational states. The consequent relaxation of excited levels via a cascade of infrared transitions might be obse...
Millimeter imaging of MWC 758: probing the disk structure and kinematics
Solar and Stellar Astrophysics (astro-ph.SR) Earth and Planetary Astrophysics (astro-ph.EP)
2011/1/5
We investigate the structure and kinematics of the circumstellar disk around the Herbig Ae star MWC 758 using high resolution observations of the 12CO (3-2) and dust continuum emission at the waveleng...
The Super Lithium-Rich Red Giant Rapid Rotator G0928+73.2600: A Case for Planet Accretion?
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/5
We present the discovery of a super lithium-rich K giant star, G0928+73.2600. This red giant (T_eff = 4885 K and log g = 2.65) is a fast rotator with a projected rotational velocity of 8.4 km/s and an...
Binary/multiple status can affect stars at all stages of their lifetimes: evolution onto the main sequence, properties on the main sequence, and subsequent evolution. 5 $M_\odot$ stars have provided a...
Signatures of binary evolution processes in massive stars
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/5
Before binary components interact, they evolve as single stars do. We therefore first critically discuss massive single star processes which affect their evolution, stellar wind mass loss and rotation...
A collision in 2009 as the origin of the debris trail of asteroid P/2010 A2
Earth and Planetary Astrophysics (astro-ph.EP)
2011/1/5
The peculiar object P/2010 A2 was discovered by the LINEAR near-Earth asteroid survey in January 2010 and given a cometary designation due to the presence of a trail of material, although there was no...
High Velocity Molecular Outflows In Massive Cluster Forming Region G10.6-0.4
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/4
We report the arcsecond resolution SMA observations of the $^{12}$CO (2-1) transition in the massive cluster forming region G10.6-0.4. In these observations, the high velocity $^{12}$CO emission is re...
Star formation in the Taurus filament L1495: From Dense Cores to Stars
Galaxy Astrophysics (astro-ph.GA)
2011/1/4
We present a study of dense structures in the L1495 filament in the Taurus Molecular Cloud and examine its star-forming properties. In particular we construct a dust extinction map of the filament usi...
Solar System Abundances of the Elements
Solar and Stellar Astrophysics (astro-ph.SR) Earth and Planetary Astrophysics (astro-ph.EP)
2011/1/4
Representative abundances of the chemical elements for use as a solar abundance standard in astronomical and planetary studies are summarized. Updated abundance tables for solar system abundances base...
Magnetic fields and the occurrence of flares and microflares are strongly concentrated near that portion (the Hale boundary) in each solar hemisphere where the change in magnetic sector polarity is th...
The formation of polycyclic aromatic hydrocarbons in evolved circumstellar environments
Solar and Stellar Astrophysics (astro-ph.SR) Galaxy Astrophysics (astro-ph.GA)
2011/1/4
The formation of Polycyclic Aromatic Hydrocarbons in the circumstellar outflows of evolved stars is reviewed, with an emphasis on carbon stars on the Asymptotic Giant Branch. Evidence for PAHs present...
Turbulent eddy-time-correlation in the solar convective zone
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/31
Theoretical modeling of the driving processes of solar-like oscillations is a powerful way of understanding the properties of the convective zones of solar-type stars. In this framework, the descripti...