Sökresultat

Towards a diffraction-limited square-kilometer optical telescope: Digital revival of intensity interferometry

Spatial resolution and photon collection. Clusters, field populations and evolution of distant galaxies

Acoustic Energy Generated by Convection: 3-D Numerical Simulations for the Sun

Dissipation of acoustic waves may be an efficient heating mechanism forthe lower and middle chromosphere of the quiet Sun. The basic idea isthat turbulent motions at the top of the solar convection zone generateacoustic waves which propagate upwards and dissipate in the lower andmiddle chromosphere, transporting energy into the higher layers. Butstill the question remains if this amount of energy

Stimulated amplification in astrophysical plasma: Fe II space laser in gas condensation in the vicinity of Eta Carinae

Sofia Feltzing - Professor i astronomi

Fe II fluorescence in symbiotic stars

The Velocity Dispersion of the Hyades as a Function of Mass and Radius

Observations of non-magnetic CP stars - Crossing boundaries

Abstract in UndeterminedObservations of chemically peculiar (CP) stars have been conducted for decades and have revealed a variety of spectrum anomalies, most prominent among them are line enhancements of heavy elements. The earlier observations were limited to the optical region and the use of less sensitive detectors, yet are responsible for much of our current characterization of the CP star ph

A European ELT design study

The Impact of Stellar Collisions in the Galactic Center

We consider whether stellar collisions can explain the observed depletion of red giants in the Galactic center. We model the stellar population with two different IMFs: 1) the Miller-Scalo and 2) a much flatter IMF. In the former case, low-mass main-sequence stars dominate the population, and collisions are unable to remove red giants out to 0.4 pc although brighter red giants much closer in may b

Euro50: A European 50 m Adaptive Optics Extremely Large Telescope

The FERRUM Project: oscillator strengths of the iron group elements: Fe II

We report on an international collaboration, the FERRUM Project, whichaims at extending the database of experimental oscillator strengths foriron group elements and possibly evaluating theoretical andastrophysical data. The selection of individual projects is made withrespect to their relevance for abundance work and plasma diagnostics inastrophysics. In this paper we present recent measurements o

Performance analysis of the improved seeing limited mode for the Euro50

This paper presents an analysis of the point-spread functions (PSFs),which may be expected in the so-called improved seeing limited mode forthe Euro50 (Extremely large telescope with a 50 m aperture). This modecomprises adaptive control of the deformable secondary mirror of theaplanatic Gregorian telescope configuration using guide stars in a widefield. I may result in efficient compensation of tu

Gaia Data Processing Architecture

Commission 14: Atomic & Molecular Data

Solar and Stellar Oscillations

Astrometric Radial Velocities I. Non-spectroscopic methods for measuring stellar radial velocity

Astrometric Radial Velocities II. Maximum-likelihood estimation of radial velocities in moving clusters

Spektrum och termanalys av fosfor I : [The spectrum and term analysis of phosporus I]

[abstract missing]

Spektrum av joniserat järn, Fe II, med astrofysiska tillämpningar

[abstract missing]