Rusty old stars: a source of the missing interstellar iron
@inproceedings{McDonald2010RustyOS, title={Rusty old stars: a source of the missing interstellar iron}, author={Iain McDonald and G. C. Sloan and Albert A. Zijlstra and Noriyuki Matsunaga and Mikako Matsuura and Kathleen E. Kraemer and Jeronimo Bernard-Salas and Andrew J. W. Markwick}, year={2010} }
Iron, the universe’s most abundant refractory element, is highly depleted in both circumstellar and interstellar environments, meaning it exists in solid form. The nature of this solid is unknown. In this Letter, we provide evidence that metallic iron grains are present around oxygen-rich asymptotic giant branch stars, where it is observationally manifest as a featureless mid-infrared excess. This identification is made using Spitzer Space Telescope observations of evolved globular cluster…
58 Citations
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References
SHOWING 1-10 OF 42 REFERENCES
Tracing the development of dust around evolved stars: The case of 47 Tuc
- Physics
- 2006
We observed mid-infrared (7.5-22 μm) spectra of asymptotic giant branch (AGB) stars in the globular cluster 47 Tuc with the Spitzer Space Telescope, and we find significant dust features of various…
Depletion in post-AGB stars with a dusty disc. II.
- Physics
- 2005
We present a chemical abundance analysis on the basis of high signal-to-noise and high resolution spectra for 12 stars of our newly defined sample. The selection criterion for the stars of this…
Dust, pulsation, chromospheres and their rôle in driving mass loss from red giants in Galactic globular clusters
- Physics
- 2007
Context. Mass loss from red giants in old globular clusters affects the horizontal branch (HB) morphology and post-HB stellar evolution including the production of ultraviolet-bright stars, dredge up…
The depletion of interstellar gaseous iron
- Physics
- 1979
The Copernicus ultraviolet telescope was used to measure equivalent widths of interstellar Fe II resonance lines toward 55 early-type stars. The measurements permit the determination of Fe II column…
The dust condensation sequence in red supergiant stars
- Physics
- 2009
Context. Red supergiant (RSG) stars exhibit significant mass loss by means of a slow, dense wind. They are often considered to be the more massive counterparts of Asymptotic Giant Branch (AGB) stars.…
Dust and the spectral energy distribution of the OH/IR star OH 127.8+0.0: Evidence for circumstellar metallic iron
- Physics
- 2002
We present a t to the spectral energy distribution of OH 127.8+0.0, a typical asymptotic giant branch star with an optically thick circumstellar dust shell. The t to the dust spectrum is achieved…
Lithium in a Cool Red Giant Member of the Globular Cluster NGC 362
- Physics
- 1999
A surprisingly strong Li I λ6707 feature has been identified in a red giant member of the globular cluster NGC 362. This giant, V2, is located near the tip of the red giant branch and could be either…
Thermal Emission Spectroscopy and Analysis of Dust, Disks, and Regoliths
- Physics, Geology
- 1999
Spectroscopy of the vibrational bands of solids provides a unique diagnostic tool for studying the mineralogy, crystallography, sizes, temperatures, and radiative transfer e†ects in these materials…
Aluminum Oxide and the Opacity of Oxygen-rich Circumstellar Dust in the 12-17 Micron Range
- Materials Science
- 1997
Amorphous alumina (Al2O3) was produced by a sol-gel technique in order to make available its optical constants for possible astrophysical applications. Gradual annealing showed that the X-ray…
A Spitzer Space Telescope atlas of ω Centauri: The stellar population, mass loss, and the intracluster medium
- Physics
- 2007
We present a Spitzer Space Telescope imaging survey of the most massive Galactic globular cluster, ω Centauri, and investigate stellar mass loss at low metallicity and the intracluster medium (ICM).…