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Thermal-diffusional Instability in White Dwarf Flames: Regimes of Flame Pulsation
KTH, Centra, Nordic Institute for Theoretical Physics NORDITA. Princeton University, United States.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 841, nr 1, artikkel-id 21Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Thermal-diffusional pulsation behaviors in planar as well as outwardly and inwardly propagating white dwarf (WD) carbon flames are systematically studied. In the 1D numerical simulation, the asymptotic degenerate equation of state and simplified one-step reaction rates for nuclear reactions are used to study the flame propagation and pulsation in WDs. The numerical critical Zel'dovich numbers of planar flames at different densities (rho - 2, 3, and 4. x. 10(7) g cm(-3)) and of spherical flames (with curvature c = -0.01, 0, 0.01, and 0.05) at a particular density (rho = 2 x 10(7) g cm-3) are presented. Flame front pulsation in different environmental densities and temperatures are obtained to form the regime diagram of pulsation, showing that carbon flames pulsate in the typical density of 2 x. 10(7) g cm(-3) and temperature of 0.6. x. 10(9) K. While being stable at higher temperatures, at relatively lower temperatures, the amplitude of the flame pulsation becomes larger. In outwardly propagating spherical flames the pulsation instability is enhanced and flames are also easier to quench due to pulsation at small radius, while the inwardly propagating flames are more stable.

sted, utgiver, år, opplag, sider
Institute of Physics Publishing (IOPP), 2017. Vol. 841, nr 1, artikkel-id 21
Emneord [en]
hydrodynamics, instabilities, stars: interiors, supernovae: general, waves, white dwarfs
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-209309DOI: 10.3847/1538-4357/aa6db2ISI: 000402310500007Scopus ID: 2-s2.0-85019766844OAI: oai:DiVA.org:kth-209309DiVA, id: diva2:1111550
Forskningsfinansiär
Swedish Research Council, 637-2014-465
Merknad

QC 20170619

Tilgjengelig fra: 2017-06-19 Laget: 2017-06-19 Sist oppdatert: 2017-06-19bibliografisk kontrollert

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