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Record Details

Record 32 of 2436
Ortho- and para-hydrogen in dense clouds, protoplanets, and planetary atmospheres
External Online Source: doi:10.1086/156318
Author and Affiliation:
Decampli, W. M.(NASA Ames Research Center, Moffett Field, CA, United States)
Cameron, A. G. W.(Harvard College Observatory and Smithsonian Astrophysical Observatory, Center for Astrophysics, Cambridge, Mass., United States)
Bodenheimer, P.(Lick Observatory, Santa Cruz, Calif., United States)
Black, D. C.(NASA Ames Research Center, Space Sciences Div., Moffett Field, Calif., United States)
Abstract: If ortho- and para-hydrogen achieve a thermal ratio on dynamical time scales in a molecular hydrogen cloud, then the specific heat is high enough in the temperature range 35-70 K to possibly induce hydrodynamic collapse. The ortho-para ratio in many interstellar cloud fragments is expected to meet this condition. The same may have been true for the primitive solar nebula. Detailed hydrodynamic and hydrostatic calculations are presented that show the effects of the assumed ortho-para ratio on the evolution of Jupiter during its protoplanetary phase. Some possible consequences of a thermalized ortho-para ratio in the atmospheres of the giant planets are also discussed.
Publication Date: Aug 01, 1978
Document ID:
19780061630
(Acquired Dec 01, 1995)
Accession Number: 78A45539
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal; vol. 223
Publisher Information: United States
Contract/Grant/Task Num: NSF AST-76-17590; NSF AST-76-81572; NCA2-OR660-703; NGR-22-007-269
Financial Sponsor: NASA; United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Lick Observatory; Santa Cruz, CA, United States
Harvard-Smithsonian Center for Astrophysics; Cambridge, MA, United States
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ABUNDANCE; HYDROGEN CLOUDS; INTERSTELLAR MATTER; PLANETARY ATMOSPHERES; STELLAR EVOLUTION; ION PRODUCTION RATES; RAMAN SPECTROSCOPY; REACTION KINETICS; SPECIFIC HEAT
Imprint And Other Notes: Astrophysical Journal, Part 1, vol. 223, Aug. 1, 1978, p. 854-858.
Miscellaneous Notes: Aug. 1, 1978, p. 854-858
Availability Source: Other Sources
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