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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

A circumstellar disk associated with a massive protostellar object

Article Abstract:

A number of disks are discovered around low and intermediate-mass young steller objects, and the presence of disks around massive young stellar objects is uncertain. To clear that a near-infrared imaging polarimetry that reveals an outflow/disk system around the Becklin-Neugebauer protostellar object, which has a mass of at least seven solar masses, is presented.

Author: Zhibo Jiang, Tamura, Motohide, Fukagawa, Misato, Hough, Jim, Lucas, Phil, Suto, Hiroshi, Ishii, Miki, Ji Yang
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
United States, Stars, Infrared imaging, Stellar mass

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Low-temperature crystallization of silicate dust in circumstellar disks

Article Abstract:

Observations of highly crystalline silicate dust in the disks around binary red-giant stars are reported. The temperatures in the disks are too low for the grains to anneal and some low-temperature process must therefore be responsible. The results indicated that low-temperature crystallization of silicate grains can occur in protoplanetary systems.

Author: Waters, L.B.F.M., de Koter, A., van Winckel, H., Molster, F.J., Tielens, A.G.G.M., de Jong, T., de Graauw, Th., Yamamura, I., Malfait, K., vand den Ancker, M.e., Voors, R.H.M., Waelkens, C.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
Research, Circumstellar matter

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Rapid planetesimal formation in turbulent circumstellar disks

Article Abstract:

The boulders can undergo efficient gravitational collapse in locally overdense regions in the midplane of the disk. Gravitational collapse has happened much faster than radial drift, thus offering a possible path to planetesimal formation in accreting circumstellar disks.

Author: Johansen, Anders, Klahr, Hubert, Henning, Thomas, Youdin, Andrew, Oishi, Jeffrey S., Low, Mordecai-Mark Mac
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2007
Natural history, Interstellar matter, Interstellar medium, Gravitational collapse, Planetesimals

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