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23 papers
Circumstellar molecular line emission from S-type AGB stars: Mass-loss rates and SiO abundances
S. Ramstedt, F. L. Schoeier, H. Olofsson
The main aim is to derive reliable mass-loss rates and circumstellar SiO abundances for a sample of 40 S-type AGB stars based on new multi-transitional CO and SiO radio line observ…
Circumstellar water vapour in M-type AGB stars: Radiative transfer models, abundances and predictions for HIFI
Matthias Maercker, Fredrik L. Schoeier, Hans Olofsson +2
Aims: By performing a detailed radiative transfer analysis, we determine fractional abundances of circumstellar H2O in the envelopes around six M-type asymptotic giant branch stars…
The abundance of SiS in circumstellar envelopes around AGB stars
F. L. Schoeier, J. Bast, H. Olofsson +1
New SiS multi-transition (sub-)millimetre line observations of a sample of AGB stars with varying photospheric C/O-ratios and mass-loss rates are presented. A combination of low- a…
A computer program for fast non-LTE analysis of interstellar line spectra
Floris van der Tak, John Black, Fredrik Schoeier +2
The large quantity and high quality of modern radio and infrared line observations require efficient modeling techniques to infer physical and chemical parameters such as temperatu…
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…
H2CO and CH3OH abundances in the envelopes around low-mass protostars
J. K. Jorgensen, F. L. Schoeier, E. F. van Dishoeck
This paper presents the third in a series of single-dish studies of molecular abundances in the envelopes around a large sample of 18 low-mass pre- and protostellar objects. It foc…