The first 8–13 μm spectra of globular cluster red giants: circumstellar silicate dust grains in 47 Tucanae (NGC 104)

@article{Loon2006TheF8,
  title={The first 8–13 $\mu$m spectra of globular cluster red giants: circumstellar silicate dust grains in 47 Tucanae (NGC 104)},
  author={Jacco Th. van Loon and Iain McDonald and Joana M. Oliveira and Aneurin Evans and Martha L. Boyer and Robert D. Gehrz and Elisha F. Polomski and Charles E. Woodward},
  journal={Astronomy and Astrophysics},
  year={2006},
  volume={450},
  pages={339-343}
}
We present 8–13 µm spectra of eight red giants in the globular cluster 47 Tucanae (NGC 104), obtained at the European Southern Observatory 3.6 m telescope. These are the first mid-infrared spectra of metal-poor, low-mass stars. The spectrum of at least one of these, namely the extremely red, large-amplitude variable V1, shows direct evidence of circumstellar grains made of amorphous silicate. 

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References

SHOWING 1-10 OF 33 REFERENCES
Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster
Improved data analysis of far infrared imaging data of the globular cluster NGC 7078 obtained with the ISO instru- ment ISOPHOT at 60 µm, 70 µm and 90 µm has detected the thermal emission from dust
Abundances for globular cluster giants: I. homogeneous metallicities for 24 clusters
We have obtained high resolution, high signal-to-noise ratio CCD echelle spectra of 10 bright red giants in 3 globular clusters (47 Tuc, NGC 6752 and NGC 6397) roughly spanning the whole range of
The 10 μm Feature of M-Type Stars in the Large Magellanic Cloud and the Dust Condensation Sequence*
We present 7-14 μm Infrared Space Observatory (ISO) spectroscopy of 12 M-type evolved stars in the Large Magellanic Cloud (LMC), in order to study the dust mineralogy and condensation process around
Isocam observations of galactic globular clusters: mass loss along the red giant branch
Deep images in the 10 ?m spectral region have been obtained for five massive Galactic globular clusters, NGC 104 (=47 Tuc), NGC 362, NGC 5139 (=? Cen), NGC 6388, NGC 7078 (=M15), and NGC 6715 (=M54)
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
Stellar mass loss and the intracluster medium in Galactic globular clusters: a deep radio survey for H i and oH
We present the results of a survey, the deepest to date, for H i emission at 21 cm and OH emission at 18 cm (lines at 1612, 1665, 1667 and 1720 MHz) in the direction towards the Galactic globular
Evolution of the dust mass loss with luminosity along the giant branch of the globular cluster 47 Tucanae
The present paper investigates the properties of the dust mass loss in stars populating the giant branch of the globular cluster 47 Tuc, by combining ISOCAM and DENIS data. Raster maps of 5 fields
Globular clusters and the Mira period–luminosity relation
A globular cluster distance scale based on Hipparcos parallaxes of subdwarfs has been used to derive estimates of MK for cluster Miras, including one in the Small Magellanic Cloud (SMC) globular
Dust-enshrouded giants in clusters in the Magellanic Clouds
We present the results of an investigation of post-Main Sequence mass loss from stars in clusters in the Magellanic Clouds, based around an imaging survey in theL � -band (3.8 µm) performed with the
Long period variables in the globular cluster 47 Tuc: Radial velocity variations
We present near infrared velocity curves for 12 long period variables (LPVs) in the globular cluster 47 Tuc (NGC 104). New light curves are also presented for these variables. Results are compared
...
1
2
3
4
...