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Observation and modelling of dusty, low gravity L, and M dwarfs
Andreas Seifahrt, Christiane Helling, Adam J. Burgasser +6
Observational facilities allow now the detection of optical and IR spectra of young M- and L-dwarfs. This enables empirical comparisons with old M- and L- dwarfs, and detailed stud…
The radii of the nearby K5V and K7V stars 61 Cyg A & B - CHARA/FLUOR interferometry and CESAM2k modeling
Pierre Kervella, Antoine Mérand, Bernard Pichon +11
Context: The main sequence binary star 61 Cyg (K5V+K7V) is our nearest stellar neighbour in the northern hemisphere. This proximity makes it a particularly well suited system for v…
A new method for the spectroscopic identification of stellar non-radial pulsation modes. II. Mode identification of the Delta Scuti star FG Virginis
W. Zima, D. Wright, J. Bentley +7
We present a mode identification based on new high-resolution time-series spectra of the non-radially pulsating Delta Scuti star FG~Vir (HD 106384, V = 6.57, A5V). From 2002 Februa…
Geometry of giant star model atmospheres: A consistency test
U. Heiter, K. Eriksson
We investigate the effect of a geometric inconsistency in the calculation of synthetic spectra of giant stars. Spectra computed with model atmospheres calculated in spherical geome…
The design and performance of the Gaia photometric system
C. Jordi, E. Hoeg, A. G. A. Brown +32
The European Gaia astrometry mission is due for launch in 2011. Gaia will rely on the proven principles of ESA's Hipparcos mission to create an all-sky survey of about one billion…
Interpolation of Stellar Model Grids and Application to the NEMO Grid
J. Nendwich, U. Heiter, F. Kupka +2
NEMO.2003 (vienna NEw MOdel grid of stellar atmospheres) is a DVD with 91,520 stellar model atmospheres representing a 5D grid of modified ATLAS9 atmospheres; the purpose of the mo…
Abundance Analysis of Planetary Host Stars I. Differential Iron Abundances
U. Heiter, R. E. Luck
We present atmospheric parameters and iron abundances derived from high-resolution spectra for three samples of dwarf stars: stars which are known to host close-in giant planets (C…
Abundance analysis of planetary host stars
U. Heiter, R. E. Luck
We present atmospheric parameters and Fe abundances derived for the majority of dwarf stars (north of -30 degrees declination) which are up to now known to host extrasolar planets.…
New grids of ATLAS9 atmospheres I: Influence of convection treatments on model structure and on observable quantities
U. Heiter, F. Kupka, C. van 't Veer-Menneret +6
We present several new sets of grids of model stellar atmospheres computed with modified versions of the ATLAS9 code. Each individual set consists of several grids of models with d…
The accretion/diffusion theory for lambda Bootis stars in the light of spectroscopic data
U. Heiter, W. W. Weiss, E. Paunzen
Most of the current theories suggest the lambda Bootis phenomenon to originate from an interaction between the stellar surface and its local environment. In this paper, we compare…
The abundance pattern of the lambda Bootis stars
U. Heiter
Within a project to investigate the properties of lambda Bootis stars, we report on their abundance pattern. High resolution spectra have been obtained for a total of twelve candid…
Atmospheric parameters and abundances of lambda Bootis stars
U. Heiter
The results of the abundance analyses of six lambda Bootis stars are presented. For three stars, the impact of individual ODFs and various treatments of convection in the calculact…