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Rapid cooling of neutron stars by hyperons and Delta isobarsDirect Urca processes with hyperons and/or nucleon isobars can occur in dense matter as long as the concentration of Lambda hyperons exceeds a critical value that is less than 3 percent and is typically about 0.1 percent. The neutrino luminosities from the hyperon Urca processes are about 5-100 times less than the typical luminosity from the nucleon direct Urca process, if the latter process is not forbidden, but they are larger than those expected from other sources. These direct Urca processes provide avenues for rapid cooling of neutron stars which invoke neither exotic states nor the large proton fraction (of order 0.11-0.15) required for the nucleon direct Urca process.
Document ID
19920054174
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Prakash, Madappa
(NASA Headquarters Washington, DC United States)
Prakash, Manju
(NASA Headquarters Washington, DC United States)
Lattimer, James M.
(New York, State University Stony Brook, United States)
Pethick, C. J.
(NORDITA, Copenhagen, Denmark; Illinois, University Urbana, United States)
Date Acquired
August 15, 2013
Publication Date
May 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 390
Issue: 2 Ma
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
92A36798
Funding Number(s)
CONTRACT_GRANT: DE-FG02-88ER-40388
CONTRACT_GRANT: NSF PHY-91-00283
CONTRACT_GRANT: DE-FG02-87ER-40317
CONTRACT_GRANT: NAGW-1583
Distribution Limits
Public
Copyright
Other

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