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Record Details

Record 9 of 22
Accretion discs around young stellar objects and the proto-sun
Author and Affiliation:
Lin, D. N. C.(Lick Observatory, Santa Cruz, CA, United States)
Abstract: Observed IR and UV excesses have widely been interpreted as signatures for accretion disks around young stellar objects. Analyses of the observed properties of these disks are important for the investigation of star formation as well as the dynamics of the protoplanetary disk out of which the solar system was formed. Accretion-disk theories suggest that evolution of protoplanetary disks is determined by the efficiency of angular momentum transport. During the formation stages, the disk dynamics are regulated by mixing of infalling material and disk gas. In the outermost regions of the disk, self-gravity may promote the growth of nonaxisymmetric perturbations which can transfer angular momentum outwards. After infall has ceased, convectively driven turbulence can redistribute angular momentum with an evolutionary timescale of 0.1 - 1 Myr. Convection in protoplanetary disks may eventually be stabilized by surface heating as the disk material is depleted.
Publication Date: Jan 01, 1989
Document ID:
19900064400
(Acquired Nov 28, 1995)
Accession Number: 90A51455
Subject Category: ASTROPHYSICS
Document Type: Conference Paper
Publication Information: (SEE A90-51451)
Publisher Information: United Kingdom
Meeting Information: Dynamics of Astrophysical Discs; Dec. 13-16, 1988; Manchester
Contract/Grant/Task Num: NSF AST-85-21636; NAGW-1211
Financial Sponsor: NASA; United States
Organization Source: Lick Observatory; Santa Cruz, CA, United States
Description: 16p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACCRETION DISKS; EARLY STARS; PROTOSTARS; STAR FORMATION; T TAURI STARS; ANGULAR MOMENTUM; MOMENTUM TRANSFER; PRE-MAIN SEQUENCE STARS; SOLAR SYSTEM; SUN
Imprint And Other Notes: IN: Dynamics of astrophysical discs; Proceedings of the Conference, Manchester, England, Dec. 13-16, 1988 (A90-51451 23-90). Cambridge, England and New York, Cambridge University Press, 1989, p. 27-42.
Availability Source: Other Sources
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