Enrichment of the Dust-to-Gas Mass Ratio in Bondi/Jeans Accretion/Cloud Systems due to Unequal Changes in Dust and Gas Incoming Velocities

The ratio of the Bondi and Jeans lengths is used to develop a cloud- accretion model that describes both an inner Bondi-type regime where gas pressure is balanced by the gravity of a central star and an outer Jeans-type regime where gas pressure is balanced by gas self-gravity. The gas density profi...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 678; no. 2; pp. 1099 - 1108
Main Author Bellan, P. M
Format Journal Article
LanguageEnglish
Published Chicago, IL IOP Publishing 10.05.2008
University of Chicago Press
Subjects
Astronomy
Earth, ocean, space
Exact sciences and technology
Australia, New South Wales, Sydney, Bondi
ISM: jets and outflows
Accretion
accretion, accretion disks
Mass ratio
MHD
Jets
Accretion disks
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Summary:The ratio of the Bondi and Jeans lengths is used to develop a cloud- accretion model that describes both an inner Bondi-type regime where gas pressure is balanced by the gravity of a central star and an outer Jeans-type regime where gas pressure is balanced by gas self-gravity. The gas density profile provided by this model makes a smooth transition from a wind-type inner solution to a Bonnor-Ebert-type outer solution. It is shown that high- velocity dust impinging on this cloud will tend to pile up due to having a different velocity profile from gas so that the dust-to-gas ratio is substantially enriched above the 1% interstellar medium (ISM) level.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0004-637X
1538-4357
DOI:10.1086/533483