A study of circumstellar envelopes around bright carbon stars. I: Structure, kinematics, and mass-loss rate
- H. Olofsson, K. Eriksson, B. Gustafsson, U. Carlström
- Physics, Geology
- 1 July 1993
We have performed a survey of circumstellar CO emission on a sample of bright carbon stars, which is relatively complete out to about 900 pc from the Sun. In total, 68 detections were made. All…
A Swedish heterodyne facility instrument for the APEX telescope
- V. Vassilev, D. Meledin, H. Olofsson
- Physics
- 1 November 2008
Aims. In March 2008, the APEX facility instrument was installed on the telescope at the site of Lliano Chajnantor in northern Chile. The main objective of the paper is to introduce the new instrument…
Models of circumstellar molecular radio line emission - Mass loss rates for a sample of bright carbon stars
- F. Schoeier, H. Olofsson
- Physics
- 26 January 2001
Using a detailed radiative transfer analysis, combined with an energy balance equation for the gas, we have performed extensive modelling of circumstellar CO radio line emission from a large sample…
Mass loss of stars on the asymptotic giant branch
- S. Höfner, H. Olofsson
- Physics, Geology
- 1 November 2018
As low- and intermediate-mass stars reach the asymptotic giant branch (AGB), they have developed into intriguing and complex objects that are major players in the cosmic gas/dust cycle. At this…
"Thermal" SiO radio line emission towards M-type AGB stars: A probe of circumstellar dust formation and dynamics
- D. G. Delgado, H. Olofsson, F. Kerschbaum, F. Schoeier, M. Lindqvist, M. Groenewegen
- Physics
- 10 February 2003
An extensive radiative transfer analysis of circumstellar SiO "thermal" radio line emission from a large sample of M-type AGB stars has been performed. The sample contains 18 irregulars of type Lb…
Molecular gas in the galaxy M 83: II kinematics of the molecular gas
- A. Lundgren, H. Olofsson, T. Wiklind, G. Rydbeck
- Physics
- 1 April 2004
We present the kinematics of the molecular gas in the barred spiral galaxy M 83 (NGC 5236). The study is based on 12CO( J= 1-0 and 2-1) observations with the Swedish-ESO Submillimetre Telescope (SE…
Mass loss rates of a sample of irregular and semiregular M-type AGB-variables
- H. Olofsson, D. G. Delgado, F. Kerschbaum, F. Schoeier
- Physics
- 11 June 2002
We have determined mass loss rates and gas expansion velocities for a sample of 69 M-type irregular (IRV; 22 objects) and semiregular (SRV; 47 objects) AGB-variables using a radiative transfer code…
Molecular gas in the galaxy M 83: I. The molecular gas distribution
- A. Lundgren, T. Wiklind, H. Olofsson, G. R. S. Observatory, Space Telescope Science Institute, O. Observatory
- Physics
- 29 September 2003
We present 12CO J=1-0 and J=2-1 Swedish-ESO Submillimetre Telescope (SEST) observations of the barred spiral galaxy M 83 (NGC 5236). The size of the CO maps is
and they cover the entire optical d…
A census of AGB stars in Local Group galaxies: II. NGC 185 and NGC 147
- W. Nowotny, F. Kerschbaum, H. Olofsson, H. E. Schwarz
- Physics
- 1 May 2003
We present results of our ongoing photometric survey of Local Group galaxies, using a four filter technique based on the method of Wing (1971) to identify and characterise the late-type stellar…
Asymptotic giant branch stars
- H. Habing, H. Olofsson
- Physics
- 2004
Preface Chapter 1: Introduction: H.J. Habing and H. Olofsson N.B.: This chapter is not yet completed! 1.1 Bits of history 1.2 The structure of AGB stars 1.3 Observational characteristics of AGB stars…
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