W Hya: molecular inventory by ISO-SWS

@article{Justtanont2004WHM,
  title={W Hya: molecular inventory by ISO-SWS},
  author={K. Justtanont and Teije de Jong and A. Tielens and Helmut Feuchtgruber and L. B. F. M. Waters},
  journal={Astronomy and Astrophysics},
  year={2004},
  volume={417},
  pages={625-635}
}
Infrared spectroscopy is a powerful tool to probe the inventory of solid state and molecular species in circumstellar ejecta. Here we analyse the infrared spectrum of the Asymptotic Giant Branch star W Hya, obtained by the Short and Long Wavelength Spectrometers on board of the Infrared Satellite Observatory. These spectra show evidence for the presence of amorphous silicates, aluminum oxide, and magnesium-iron oxide grains. We have modelled the spectral energy distribution using laboratory… 
Oxygen-rich AGB stars with optically thin dust envelopes
The dust composition and dynamics of the circumstellar envelopes of oxygen-rich AGB stars with low mass-loss rates (5 × 10 −8 -10 −5 Myr −1 ) have been investigated. We have analyzed the ISO-SWS
The wind of W Hydrae as seen by Herschel - II. The molecular envelope of W Hydrae
Context. The evolution of low- and intermediate-mass stars on the asymptotic giant branch (AGB) is mainly controlled by the rate at which these stars lose mass in a stellar wind. Understanding the
The mid-infrared diameter of W Hydrae ,
Aims. Asymptotic giant branch (AGB) stars are among the largest distributors of dust into the interstellar medium, and it is therefore important to understand the dust formation process and sequence
The wind of W Hydrae as seen by Herschel I. The CO envelope
Context. Asymptotic giant branch (AGB) stars lose their envelopes by means of a stellar wind whose driving mechanism is not understood well. Characterizing the composition and thermal and dynamical
W Hya through the eye of Odin. Satellite observations of circumstellar submillimetre H2O line emission
We present Odin observations of the AGB star W Hya in the ground-state transition of ortho-H2O, 110 − 101 ,a t 557 GHz. The line is clearly of circumstellar origin. Radiative transfer modelling of
Spectro-Imaging of the Asymmetric Inner Molecular and Dust Shell Region of the Mira Variable W Hya with MIDI/VLTI
We have observed W Hya, one of the closest and best-studied oxygen-rich evolved stars, in the dust sensitive mid-IR spectral domain with the interferometric instrument MIDI. Images could be obtained
On the detection of CO and mass-loss of bulge OH/IR stars
We report on the successful search forCO(2-1) and (3-2) emission associated with OH/IR stars in the Galactic bulge. We observed a sample of eight extremely red asymptotic giant branch stars with the
Circumstellar Ion-Molecule Chemistry: Observations of HCO+ in the Envelopes of O-rich Stars and IRC+10216
Millimeter-wave observations of HCO+ have been conducted toward oxygen-rich circumstellar envelopes, as well as IRC+10216, using the facilities of the Arizona Radio Observatory (ARO). The J = 1 → 0
Dust and molecular shells in asymptotic giant branch stars - Mid-infrared interferometric observations of R Aquilae, R Aquarii, R Hydrae, W Hydrae, and V Hydrae
Context. Asymptotic giant branch (AGB) stars are one of the largest distributors of dust into the interstellar medium. However, the wind formation mechanism and dust condensation sequence leading to
VLBA SiO observations of bright O-rich AGB stars
We present the results of observations of the SiO masers at 7 mm wavelength in several oxygen rich Asymptotic Giant Branch (AGB) stars. These observations were coordinated with observations using the
...
1
2
3
...

References

SHOWING 1-10 OF 41 REFERENCES
The formation and annealing of circumstellar dust, as gauged by IRAS low-resolution spectra and the microwave maser chronology
By comparing IRAS mean colors and LRS spectral differences in a large sample of Mira variables with the chronological sequence for development of microwave maser emission among such stars, it appears
OH-IR stars. I. Physical properties of circumstellar envelopes
A theoretical model of the circumstellar envelope which surrounds a OH-IR star is developed. The circumstellar gas is ejected by radiation pressure which acts on dust grains that condense in the
Spectroscopic constraints on the properties of dust in active galactic nuclei
The optical properties of graphite, silicate, and SiC grains over the wavelength range 1000 microns - 1 A are calculated for grains in the 0.005-10-micron size range. Both graphite + silicate (MRN)
Water and Dust Emission from W Hydrae
We construct a self-consistent model for the wind around W Hya by solving the coupled equations describing the hydrodynamics and dust radiative transfer problems. The model matches simultaneously the
Mass loss from OH/IR stars - Models for the infrared emission of circumstellar dust shells
The IR emission of a sample of 24 OH/IR stars is modeled, and the properties of circumstellar dust and mass-loss rate of the central star are derived. It is shown that for some sources the
Dust features in the 10-mu m infrared spectra of oxygen-rich evolved stars
We have analyzed the 8 13:5 mU KIRT CGS3 spectra of 142 M-type stars including 80 oxygen- rich AGB stars and 62 red supergiants, with a view to understanding the dierences and similarities between
Sources of the 13 Microns Feature Associated with Oxygen-Rich Circumstellar Dust
A search of the database of spectra from the IRAS Low-Resolution Spectrometer has revealed 13 micron emission features in 187 sources, most of which are associated with stars embedded within
A subarcsecond H2O maser shell surrounding a variable star
Radio continuum and H{sub 2}O maser emission have been detected from the semiregular variable W Hya. The continuum emission at radio frequencies probably comes from the outer photosphere of the red
Full polarization structure of the OH main‐line maser envelopes of W Hydrae
Simultaneous MERLIN observations of the OH 1665- and 1667-MHz maser lines in the circumstellar envelope of the semiregular star W Hya have been taken in all Stokes parameters. The 1665-MHz emission
Modelling the dust and gas outflows from IRC+10 216 - I. Ground-based and airborne observations
We have developed a model for the dust and gas envelope of the C star IRC+10 216. Spherical symmetry is assumed, and the model consistently solves the full radiative transfer problem for the
...
1
2
3
4
5
...