Hans Olofsson
Min forskning berör den sista utvecklingen av sol-liknande stjärnor på och efter den asymptotiska jättegrenen (AGB). Dessa stjärnor bidrar på ett signifikant sätt till galaxernas livscykel, kanske redan i det unga universum. Deras massförlust är den viktigaste processen, och i stjärnvindarna skapas den stoft- och molekyllinjestrålning som används i forskningen. Av speciellt intresse är vindarnas sammansättning, dvs förekomsthalter av atomer och molekyler, isotopkvoter, och stoftsammansättningar. Slutligen så är den dramatiska utvecklingen från AGB-stjärna till planetarisk nebulosa av stort intresse.
Visar 132 publikationer
Heavy-element Rydberg transition line emission from the post-giant-evolution star HD 101584
The surprisingly carbon-rich environment of the S-type star W Aql
VLTI/PIONIER reveals the close environment of the evolved system HD 101584
CO and HCN isotopologue ratios in the outflows of AGB stars
VLTI images of circumbinary disks around evolved stars
Imaging the dust and the gas around Mira using ALMA and SPHERE/ZIMPOL
HD 101584: circumstellar characteristics and evolutionary status
ALMA spectrum of the extreme OH/IR star OH 26.5+0.6
The discovery of an asymmetric detached shell around the "fresh" carbon AGB star TX Psc
Rotation of the asymptotic giant branch star R Doradus
High-resolution observations of gas and dust around Mira using ALMA and SPHERE/ZIMPOL
Circumstellar environment of the M-type AGB star R Doradus APEX spectral scan at 159.0-368.5GHz
Sulphur-bearing molecules in AGB stars. Part 2. II. Abundances and distributions of CS and SiS
SEPIA - A new single pixel receiver at the APEX telescope
Mass loss of stars on the asymptotic giant branch: Mechanisms, models and measurements
Sulphur-bearing molecules in AGB stars. Part I. The occurrence of hydrogen sulphide
First detection of methanol towards a post-AGB object, HD 101584
Search for aluminium monoxide in the winds of oxygen-rich AGB stars
(HCN)-C-12 and (HCN)-C-13 excitation analysis in the circumstellar outflow of R Sculptoris
The VLTI/MIDI view on the inner mass loss of evolved stars from the Herschel MESS sample
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
Rings and filaments: The remarkable detached CO shell of U Antliae
The shock-heated atmosphere of an asymptotic giant branch star resolved by ALMA
Herschel/HIFI observations of the circumstellar ammonia lines in IRC+10216
The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud
A detailed view of the gas shell around R Sculptoris with ALMA
Sulphur molecules in the circumstellar envelopes of M-type AGB stars
An ALMA view of the post-AGB object HD 101584
Classifying the secondary component of the binary star W Aquilae
H2O Isotopologues in Extreme OH/IR Stars
Nucleosynthesis in AGB Stars Traced by Oxygen Isotopic Ratios
An ALMA View of the Complex Circumstellar Environment of the Post-AGB Object HD 101584
First 230? GHz VLBI fringes on 3C 279 using the APEX Telescope (Research Note)
The Circumstellar (CO)-C-12/(CO)-C-13 Ratio in AGB Stars of Different Chemical Type
ALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae
A new 3 mm band receiver for the Onsala 20 m antenna
Detailed Modelling of the Circumstellar Envelope of the S-type AGB Star W Aquilae
VLTI/MIDI Large Program: AGB Stars at Different Spatial Scales
Detection of Cl line emission from the detached CO shell of the AGB star R Sculptoris
The wonderful complexity of the Mira AB system
The wind of W Hydrae as seen by Herschel I. The CO envelope
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
LOFAR: The LOw-Frequency ARray
The wind of the M-type AGB star RT Virginis probed by VLTI/MIDI
The abundance of HCN in circumstellar envelopes of AGB stars of different chemical type
To be or not to be asymmetric? VLTI and the mass loss geometry of red giants
Herschel/HIFI observations of red supergiants and yellow hypergiants I. Molecular inventory
TWINKLING STARS The disappearing SiO masers of W Aql
Unexpectedly large mass loss during the thermal pulse cycle of the red giant star R Sculptoris
Herschel/HIFI observations of O-rich AGB stars: molecular inventory
The geometry of the close environment of SV Piscium as probed by VLTI/MIDI
LPVs as possible distance indicators in NGC147 and NGC185
The Mass-Loss Rates and Molecular Abundances of S-type AGB Stars
Observing pulsars and fast transients with LOFAR
AGB Mass-Loss Characteristics: Rates, Temporal Variation, and Geometries
A Possible Solution to the Mass-Loss Problem in M-type AGB Stars
Detection of interstellar hydrogen peroxide
A HIFI View of Circumstellar H2O Emission from the S-type AGB Star X Cyg
Detached Shells of Dust and Gas around Carbon Stars
Imaging the circumstellar dust around AGB stars with PolCor
Imaging the Circumstellar Dust Distribution around AGB Stars with the NOT/PolCor Instrument
A Pilot Imaging Line Survey of RW LMi and IK Tau Using the Expanded Very Large Array
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
Polarisation observations of VY Canis Majoris H2O 532-441 620.701 GHz maser emission with HIFI
Discovery of water vapour in the carbon star V Cygni from observations with Herschel/HIFI
Herschel/HIFI deepens the circumstellar NH3 enigma
High-resolution HST/ACS images of detached shells around carbon stars
The detached dust and gas shells around the carbon star U Antliae
Herschel/HIFI observations of high-J CO transitions in the protoplanetary nebula CRL 618
APEX: Five years of operations
Circumstellar molecular line emission from S-type AGB stars: mass-loss rates and SiO abundances
CO in OH/IR stars close to the Galactic centre (Research Note)
The detached dust and gas shells around the carbon star U Ant
A Swedish heterodyne facility instrument for the APEX telescope
Nb3Al thin film deposition for low-noise terahertz electronics
Probing chemical processes in AGB stars
The study of evolved stars with ALMA
A circumstellar journey-physics and chemistry of AGB stellar winds
Circumstellar H2O in M-type AGB stars
MERLIN observations of OH/IR stars
On the reliability of mass-loss-rate estimates for AGB stars
MERLIN observations of OH/IR stars
The study of evolved stars with ALMA
Star Formation and Molecular Gas in M83
The physics and chemistry of circumstellar envelopes of S-stars on the AGB
Facility Heterodyne Receiver for the Atacama Pathfinder Experiment Telescope
The Physics and Chemistry of Circumstellar Envelopes of S Stars on the AGB
The abundance of SiS in circumstellar envelopes around AGB stars
Molecular oxygen in the p Ophiuchi cloud
Nb3Al thin film deposition for low-noise terahertz electronics
Non-Equilibrium Chemistry and Dust Formation in AGB Stars as Probed by SiO Line Emission
Modelling of Circumstellar H2O Line Emission from M-type AGB Stars
Molecular Abundandances in AGB Circumstellar Envelopes
Mass-loss properties of S-stars on the AGB
A 0.8 mm heterodyne facility receiver for the APEX telescope
The circumstellar environment of asymptotic giant branch stars
The distribution of SiO in the circumstellar envelope around IRC+10216
Circumstellar CO in OH/IR Stars Close to the Galactic Centre
Molecules in bipolar proto-planetary nebulae
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Visar 3 forskningsprojekt
Sol-liknande stjärnors sena utveckling
Ordinära stjärnors extraordinära död
Advanced Radio Astronomy in Europe (RADIONET-FP7)