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Record 1 of 1185
Rapid cooling of neutron stars by hyperons and Delta isobars
Author and Affiliation:
Prakash, Madappa(NASA, Washington, DC, United States)
Prakash, Manju(NASA, Washington, DC, United States)
Lattimer, James M.(New York, State University, Stony Brook, United States)
Pethick, C. J.(NORDITA, Copenhagen, Denmark, Illinois, University)
Abstract: Direct 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.
Publication Date: May 10, 1992
Document ID:
19920054174
(Acquired Nov 22, 1995)
Accession Number: 92A36798
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 390; 2, Ma
Publisher Information: United States
Contract/Grant/Task Num: DE-FG02-88ER-40388; DE-FG02-87ER-40317; NSF PHY-91-00283; NAGW-1583
Financial Sponsor: NASA; United States
Organization Source: NASA; Washington, DC, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: COOLING; HYPERONS; NEUTRON STARS; NUCLEAR ISOBARS; STELLAR TEMPERATURE; NEUTRINOS; NUCLEAR REACTIONS; STELLAR PHYSICS
Imprint And Other Notes: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. L77-L80.
Availability Source: Other Sources
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