Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992dudi.work..186w&link_type=abstract
"Dusty Discs, Proceedings of the 9th RAL Workshop on Astronomy and Astrophysics. Edited by P.M. Gondhalekar.
Astronomy and Astrophysics
Astrophysics
Scientific paper
The optically thin Vega-like particulate disks believed to exist around many main sequence stars will be rapidly processed by interstellar dust grains unless they are shielded by the magnetic fields associated with stellar winds. When not shielded, the time scale for interstellar collisional processing is much less than the time scale for Poynting-Robertson and internal-collision depletion. The authors show that magnetic fields associated with stellar winds of solar magnitude will shield the disks in interstellar voids but not inside clouds of gas density ≥1 cm-3. When exposed to the cloud flux, multiple impact fragmentation of the larger circumstellar grains will result in a significant increase in the disk area and optical depth. The brightning of the disk could persist for millions of years after the star emerges from the cloud. This model can explain the observed velocity streaming of the brightest disk stars, whose centroid passed through the massive Sco Oph cloud complex some 6 Myr ago, and the dearth of late A type dwarfs with particulate disks.
Matese John J.
Whitman Patrick Gene
Whitmire Daniel P.
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