NDLI: Modeling the evolution of Sakurai's Object

Content Provider	Springer Nature Link
Author	Herwig, Falk
Copyright Year	2002
Abstract	Sakurai's Object is a born again AGBstar of the very late thermal pulse flavor. In thiscontribution I will discuss new models of stellar evolution andnucleosynthesis models of this phase. Two most intriguing properties ofSakurai's Object have so far not been understood theoretically: the peculiar chemical appearance, in particular the high lithiumabundance, and the short time scale of only a few years on which thetransition from the dwarf configuration into the born again giantappearance has occurred. A new nucleosynthesis mode of hot hydrogen-deficient 3He burning can explain the extraordinarylithium abundance. During the thermal pulse 3He is ingested fromthe envelope together with the protons into the hot He-flashconvection zone. The first network calculations show that, due to thelarge 12C abundance protons are captured rather by carbon, thandestroy newly formed 7Be and ultimately 7Li. Moreover, the shortevolution time scale has been reproduced by making the assumption that the convective efficiency forelement mixing is smaller by two to three orders of magnitude thanpredicted by the mixing-length theory. As a result the main energygeneration from fast convective proton capture will occur at a largermass coordinate, closer to the surface and the expansion to the giantstate is accelerated to a few years, in excellent agreement with thebehavior of Sakurai's Object. This result represents an independent empiricalconstraint on the poorly known efficiency of element mixing inconvective zones of the stellar interior.
Starting Page	103
Ending Page	113
Page Count	11
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	279
Issue Number	1-2
e-ISSN	1572946X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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