Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.148d&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Other
Scientific paper
We would like to present the results obtained from a Herschel PACS far-infrared spectrum of the debris disk of β Pictoris. From the analysis of the 69μ m band of crystalline olivine ( (Mg, Fe)2SiO4 ) and the Spitzer mid-infrared spectrum we have found that:
- The grains are colder than expected (˜55 K vs ˜100 K expected from the bulk dust population)
- Their composition is not purely magnesium rich. Which is contrary to what is concluded from detections in many other types of sources
We can determine both the temperature and composition of the crystalline olivines grains because the position and shape of the 69μ m band is sensitive to both. Looking at different kind of objects, from Young Stellar Objects to Asymptotic Giant Branch stars and Planetary Nebula, the crystalline olivines that are observed are always seen as pure forsterite (Mg2SiO4). It is the first time that crystalline olivine grains are found that contain 2-3% iron. This raises questions about the exact formation and origin of these minerals.
Acke Bram
Blommaert Joris A. D. L.
de Vries Bernard L.
Vandenbussche Bart
Waelkens Christoffel
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