Hans Olofsson
My research focusses on the final evolution of solar-type stars on and beyond the asymptotic giant branch (AGB). These stars are important ingredients in the life cycle of galaxies, maybe even in the early universe. The stellar mass loss is the key process, and the stellar winds provide the dust and molecular line emission which lies at the base of the analysis. Of particular importance are the compositions of the stellar winds, i.e., atomic and molecular abundances, isotope ratios, and dust species. Finally, the dramatic changes in mass-loss properties and chemistry as the object leaves the AGB and evolves towards the planetary nebula stage are part of the research.
Showing 142 publications
ALMA observations of CO isotopologues towards six obscured post-asymptotic giant branch stars
An impressionist view of V Hydrae: When MATISSE paints asymmetric giant blobs
Probing the dynamical and kinematical structures of detached shells around AGB stars
The <sup>17</sup>O/<sup>18</sup>O Ratio of Post-AGB Sources: Canonical and Non-Canonical Populations
The salty emission of the intermediate-mass AGB star OH 30.1-0.7
Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX
Gas and Dust in the Circumstellar Envelopes of Stars on (and Beyond) the AGB
Heavy-element Rydberg transition line emission from the post-giant-evolution star HD 101584
VLTI/PIONIER reveals the close environment of the evolved system HD 101584
The surprisingly carbon-rich environment of the S-type star W Aql
CO and HCN isotopologue ratios in the outflows of AGB stars
VLTI images of circumbinary disks around evolved stars
HD 101584: circumstellar characteristics and evolutionary status
The discovery of an asymmetric detached shell around the "fresh" carbon AGB star TX Psc
ALMA spectrum of the extreme OH/IR star OH 26.5+0.6
Imaging the dust and the gas around Mira using ALMA and SPHERE/ZIMPOL
SEPIA - A new single pixel receiver at the APEX telescope
Rotation of the asymptotic giant branch star R Doradus
Sulphur-bearing molecules in AGB stars. Part 2. II. Abundances and distributions of CS and SiS
High-resolution observations of gas and dust around Mira using ALMA and SPHERE/ZIMPOL
Mass loss of stars on the asymptotic giant branch: Mechanisms, models and measurements
Circumstellar environment of the M-type AGB star R Doradus APEX spectral scan at 159.0-368.5GHz
First detection of methanol towards a post-AGB object, HD 101584
The VLTI/MIDI view on the inner mass loss of evolved stars from the Herschel MESS sample
Rings and filaments: The remarkable detached CO shell of U Antliae
The shock-heated atmosphere of an asymptotic giant branch star resolved by ALMA
Sulphur-bearing molecules in AGB stars. Part I. The occurrence of hydrogen sulphide
(HCN)-C-12 and (HCN)-C-13 excitation analysis in the circumstellar outflow of R Sculptoris
Search for aluminium monoxide in the winds of oxygen-rich AGB stars
Water isotopologues in the circumstellar envelopes of M-type AGB stars
The circumstellar envelope around the S-type AGB star W Aql Effects of an eccentric binary orbit
Sulphur molecules in the circumstellar envelopes of M-type AGB stars
An ALMA view of the post-AGB object HD 101584
A detailed view of the gas shell around R Sculptoris with ALMA
The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud
Herschel/HIFI observations of the circumstellar ammonia lines in IRC+10216
Nucleosynthesis in AGB Stars Traced by Oxygen Isotopic Ratios
A new 3 mm band receiver for the Onsala 20 m antenna
VLTI/MIDI Large Program: AGB Stars at Different Spatial Scales
An ALMA View of the Complex Circumstellar Environment of the Post-AGB Object HD 101584
ALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae
The Circumstellar (CO)-C-12/(CO)-C-13 Ratio in AGB Stars of Different Chemical Type
Detection of Cl line emission from the detached CO shell of the AGB star R Sculptoris
H2O Isotopologues in Extreme OH/IR Stars
Classifying the secondary component of the binary star W Aquilae
Detailed Modelling of the Circumstellar Envelope of the S-type AGB Star W Aquilae
First 230? GHz VLBI fringes on 3C 279 using the APEX Telescope (Research Note)
The wonderful complexity of the Mira AB system
Detailed modelling of the circumstellar molecular line emission of the S-type AGB star W Aquilae
The wind of W Hydrae as seen by Herschel II. The molecular envelope of W Hydrae
Outflows from Binary AGB stars with ALMA
The wind of W Hydrae as seen by Herschel I. The CO envelope
The wind of the M-type AGB star RT Virginis probed by VLTI/MIDI
LOFAR: The low-frequency array
The abundance of HCN in circumstellar envelopes of AGB stars of different chemical type
TWINKLING STARS The disappearing SiO masers of W Aql
To be or not to be asymmetric? VLTI and the mass loss geometry of red giants
Unexpectedly large mass loss during the thermal pulse cycle of the red giant star R Sculptoris
The geometry of the close environment of SV Piscium as probed by VLTI/MIDI
LPVs as possible distance indicators in NGC147 and NGC185
Herschel/HIFI observations of O-rich AGB stars: molecular inventory
Herschel/HIFI observations of red supergiants and yellow hypergiants I. Molecular inventory
Imaging the Circumstellar Dust Distribution around AGB Stars with the NOT/PolCor Instrument
A HIFI View of Circumstellar H2O Emission from the S-type AGB Star X Cyg
Long-period variables in NGC 147 and NGC 185
X Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed by Herschel
Detection of interstellar hydrogen peroxide
Observing pulsars and fast transients with LOFAR
AGB Mass-Loss Characteristics: Rates, Temporal Variation, and Geometries
The Mass-Loss Rates and Molecular Abundances of S-type AGB Stars
Detached Shells of Dust and Gas around Carbon Stars
A Possible Solution to the Mass-Loss Problem in M-type AGB Stars
A Pilot Imaging Line Survey of RW LMi and IK Tau Using the Expanded Very Large Array
Imaging the circumstellar dust around AGB stars with PolCor
Polarisation observations of VY Canis Majoris H2O 532-441 620.701 GHz maser emission with HIFI
Herschel/HIFI deepens the circumstellar NH3 enigma
The detached dust and gas shells around the carbon star U Antliae
High-resolution HST/ACS images of detached shells around carbon stars
APEX: Five years of operations
Herschel/HIFI observations of high-J CO transitions in the protoplanetary nebula CRL 618
Discovery of water vapour in the carbon star V Cygni from observations with Herschel/HIFI
CO in OH/IR stars close to the Galactic centre (Research Note)
The detached dust and gas shells around the carbon star U Ant
Circumstellar molecular line emission from S-type AGB stars: mass-loss rates and SiO abundances
Circumstellar H2O in M-type AGB stars
Star Formation and Molecular Gas in M83
A Swedish heterodyne facility instrument for the APEX telescope
A circumstellar journey-physics and chemistry of AGB stellar winds
MERLIN observations of OH/IR stars
MERLIN observations of OH/IR stars
Nb3Al thin film deposition for low-noise terahertz electronics
Probing chemical processes in AGB stars
The study of evolved stars with ALMA
The study of evolved stars with ALMA
On the reliability of mass-loss-rate estimates for AGB stars
The physics and chemistry of circumstellar envelopes of S-stars on the AGB
Gas and Dust Mass Loss of O-rich AGB-stars
Nb3Al thin film deposition for low-noise terahertz electronics
The Physics and Chemistry of Circumstellar Envelopes of S Stars on the AGB
Non-Equilibrium Chemistry and Dust Formation in AGB Stars as Probed by SiO Line Emission
Molecular oxygen in the p Ophiuchi cloud
Modelling of Circumstellar H2O Line Emission from M-type AGB Stars
Facility Heterodyne Receiver for the Atacama Pathfinder Experiment Telescope
The abundance of SiS in circumstellar envelopes around AGB stars
A 0.8 mm heterodyne facility receiver for the APEX telescope
Circumstellar CO in OH/IR Stars Close to the Galactic Centre
The distribution of SiO in the circumstellar envelope around IRC+10216
Molecular Abundandances in AGB Circumstellar Envelopes
Mass-loss properties of S-stars on the AGB
The circumstellar environment of asymptotic giant branch stars
Molecules in bipolar proto-planetary nebulae
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Showing 3 research projects
Late evolution of solar-type stars
The extra-ordinary deaths of ordinary stars
Advanced Radio Astronomy in Europe (RADIONET-FP7)