356 citations · 1.3k across the 25 of their papers we have counts for
8 papers · 1 filter
On the reliability of mass-loss-rate estimates for AGB stars
Sofia Ramstedt, Fredrik L. Schoeier, Hans Olofsson +1
In the recent literature there has been some doubt as to the reliability of CO multi-transitional line observations as a mass-loss-rate estimator for AGB stars. Mass-loss rates for…
Spiral inflow feeding the nuclear starburst in M83, observed in H-alpha emission with the GHAFAS Fabry-Perot interferometer
Kambiz Fathi, John E. Beckman, Andreas A. Lundgren +8
We present observations of the nearby barred starburst galaxy, M83 (NGC5236), with the new Fabry-Perot interferometer GHAFAS mounted on the 4.2 meter William Herschel Telescope on…
A multi-transition submillimeter water maser study of evolved stars - detection of a new line near 475 GHz
K. M. Menten, A. Lundgren, A. Belloche +2
Context: Maser emission from the H2O molecule probes the warm, inner circumstellar envelopes of oxygen-rich red giant and supergiant stars. Multi-maser transition studies can be us…
Mass-loss properties of S-stars on the AGB
S. Ramstedt, F. L. Schoeier, H. Olofsson +1
We have used a detailed non-LTE radiative transfer code to model new APEX CO(J=3-2) data, and existing CO radio line data, on a sample of 40 AGB S-stars. The derived mass-loss-rate…
Probable detection of H2D+ in the starless core Barnard 68
M. R. Hogerheijde, P. Caselli, M. Emprechtinger +8
The presence of H2D+ in dense cloud cores underlies ion-molecule reactions that strongly enhance the deuterium fractionation of many molecular species. We determine the H2D+ abunda…
SiO in C-rich circumstellar envelopes of AGB stars: effects of non-LTE chemistry and grain adsorption
F. L. Schoeier, H. Olofsson, A. A. Lundgren
New SiO multi-transition millimetre line observations of a sample of carbon stars, including J=8-7 observations with the APEX telescope, are used to probe the role of non-equilibri…