152 citations · 216 across the 7 of their papers we have counts for
7 papers
The unique capabilities of HST for stellar physics: Probing Atmospheric Structure, Chromospheres, and Mass Loss of Evolved Stars
Maryam Saberi, Graham Harper, Jacco Th. van Loon +10
Evolved stars are among the primary sources of chemical enrichment and dust production in galaxies. During the giant phases, stars return a substantial fraction of their mass to th…
Asymmetries in asymptotic giant branch stars and their winds. I. From 3D RHD models to synthetic observables
Joachim Wiegert, Bernd Freytag, Susanne Höfner
[Abridged] AGB stars are significant contributors to the metal enrichment of the interstellar medium. In this paper, we adapted models from advanced RHD simulations as input for ra…
How to disentangle geometry and mass-loss rate from AGB-star spectral energy distributions -- The case of EP Aqr
J. Wiegert, M. A. T. Groenewegen, A. Jorissen +2
High-angular-resolution observations of asymptotic giant branch (AGB) stars often reveal non-spherical morphologies for the gas and dust envelopes. We aim to make a pilot study to…
94 Ceti: a triple star with a planet and dust disc
J. Wiegert, V. Faramaz, F. Cruz-Saenz de Miera
94 Ceti is a triple star system with a circumprimary gas giant planet and far-infrared excess. Such excesses around main sequence stars are likely due to debris discs, and are cons…
How dusty is alpha Centauri? Excess or non-excess over the infrared photospheres of main-sequence stars
J. Wiegert, R. Liseau, P. Thébault +19
[Abridged] Debris discs around main-sequence stars indicate the presence of larger rocky bodies. The components of the nearby binary aCentauri have higher than solar metallicities,…
Centauri A in the far infrared
R. Liseau, B. Montesinos, G. Olofsson +15
Chromospheres and coronae are common phenomena on solar-type stars. Understanding the energy transfer to these heated atmospheric layers requires direct access to the relevant empi…
The effective stability parameter for two-component galactic discs: Is 1/Q ~ 1/Q_stars + 1/Q_gas ?
Alessandro B. Romeo, Joachim Wiegert
The Wang-Silk approximation, 1/Q ~ 1/Q_stars + 1/Q_gas, is frequently used for estimating the effective Q parameter in two-component discs of stars and gas. Here we analyse this ap…