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Asymptotic strength of thermal pulses in the helium shell burning

Journal Article:

Abstract

Secular growth in the strength of the recurrent thermal pulses of helium shell burning is discussed for the purpose of determining its asymptotic strength. It is shown that the pulse grows stronger if the helium zone has been cooled more before the initiation of the pulse. The secular growth of the pulse is related with the increasing degree of cooling. Thermal pulses are computed for an initial model corresponding to the maximum possible cooling, i.e., for a model in which the steady-state entropy distribution was realized in the helium zone. Such thermal pulses are shown to give an upper bound to the asymptotic strength, which is close enough to the asymptotic strength itself for relatively large core masses. Numerical results are given for the core mass of 1.07 M sub(sun), for which the asymptotic strength is found to be 9 x 10/sup 6/ L sub(sun). Thermal pulses are also computed for an initial model which has been cooled artificially more than the steady-state model. The first pulse results in a much greater strength than in the normal model, but a later pulse approaches the normal asymptotic value. Such models are also discussed in relation to the shell flashes on accreting  More>>
Authors:
Fujimoto, M Y; [1]  Sugimoto, D
  1. Niigata Univ. (Japan)
Publication Date:
Mar 01, 1979
Product Type:
Journal Article
Reference Number:
AIX-11-515577; EDB-80-113677
Resource Relation:
Journal Name: Publ. Astron. Soc. Jpn.; (Japan); Journal Volume: 31:1
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; WHITE DWARF STARS; S PROCESS; ENTROPY; HELIUM BURNING; PULSES; STAR ACCRETION; STAR MODELS; DWARF STARS; MATHEMATICAL MODELS; PHYSICAL PROPERTIES; STAR BURNING; STAR EVOLUTION; STARS; THERMODYNAMIC PROPERTIES; 640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
OSTI ID:
5022666
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: PASJA
Submitting Site:
INIS
Size:
Pages: 1-10
Announcement Date:
May 01, 1980

Journal Article:

Citation Formats

Fujimoto, M Y, and Sugimoto, D. Asymptotic strength of thermal pulses in the helium shell burning. Japan: N. p., 1979. Web.
Fujimoto, M Y, & Sugimoto, D. Asymptotic strength of thermal pulses in the helium shell burning. Japan.
Fujimoto, M Y, and Sugimoto, D. 1979. "Asymptotic strength of thermal pulses in the helium shell burning." Japan.
@misc{etde_5022666,
title = {Asymptotic strength of thermal pulses in the helium shell burning}
author = {Fujimoto, M Y, and Sugimoto, D}
abstractNote = {Secular growth in the strength of the recurrent thermal pulses of helium shell burning is discussed for the purpose of determining its asymptotic strength. It is shown that the pulse grows stronger if the helium zone has been cooled more before the initiation of the pulse. The secular growth of the pulse is related with the increasing degree of cooling. Thermal pulses are computed for an initial model corresponding to the maximum possible cooling, i.e., for a model in which the steady-state entropy distribution was realized in the helium zone. Such thermal pulses are shown to give an upper bound to the asymptotic strength, which is close enough to the asymptotic strength itself for relatively large core masses. Numerical results are given for the core mass of 1.07 M sub(sun), for which the asymptotic strength is found to be 9 x 10/sup 6/ L sub(sun). Thermal pulses are also computed for an initial model which has been cooled artificially more than the steady-state model. The first pulse results in a much greater strength than in the normal model, but a later pulse approaches the normal asymptotic value. Such models are also discussed in relation to the shell flashes on accreting white dwarfs.}
journal = {Publ. Astron. Soc. Jpn.; (Japan)}
volume = {31:1}
journal type = {AC}
place = {Japan}
year = {1979}
month = {Mar}
}