The impact of the uncertainties in the 12C(α,γ)16O reaction rate on the evolution of low- to intermediate-mass stars

Abstract

One of the largest uncertainties in stellar evolutionary computations is the accuracy of the considered reaction rates. The 12C(alpha,gamma)16O reaction is particularly important for the study of low- and intermediate-mass stars as it determines the final C/O ratio in the core which influences the white dwarf cooling evolution. Thus, there is a need for a study of how the computations of white dwarfs and their progenitors that are made to date may be affected by the uncertainties of the 12C(alpha,gamma)16O reaction rates. In this work we compute fully evolutionary sequences using the MESA code with initial masses in the range of 0.90 <= Mi/Msun <= 3.05. We consider different adopted reaction rates, obtained from the literature, as well as the extreme limits within their uncertainties. As expected, we find that previous to the core helium burning stage there are no changes to the evolution of the stars. However, the subsequent stages are all affected by the uncertainties of the considered reaction rate. In particular, we find differences to the convective core mass during the core helium burning stage which may affect pulsation properties of subdwarfs, the number of thermal pulses during the asymptotic giant branch and trends between final oxygen abundance in the core and the progenitor masses of the remnant white dwarfs.

15 pages, 15 figures, 1 table

References in corpus (14)

• Modules for Experiments in Stellar Astrophysics (MESA)
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• Pulsating White Dwarf Stars and Precision Asteroseismology
• Constraints from gravitational wave detections of binary black hole mergers on the ${}^{12}\mathrm{C}{\left(\alpha ,\gamma \right)}^{16}\mathrm{O}$ rate
• Asteroseismic inferences on GW Vir variable stars in the frame of new PG 1159 evolutionary models
• Carbon star formation as seen through the non-monotonic initial-final mass relation
• The Physics of Crystallization from Globular Cluster White Dwarf Stars in NGC 6397
• On the Sensitivity of Massive Star Nucleosynthesis and Evolution to Solar Abundances and to Uncertainties in Helium Burning Reaction Rates
• The age-metallicity dependence for white dwarfs
• Asteroseismology of ZZ Ceti stars with fully evolutionary white dwarf models: I. The impact of the uncertainties from prior evolution on the period spectrum
• The treatment of mixing in core helium burning models -- III. Suppressing core breathing pulses with a new constraint on overshoot
• Can the third dredge-up extinguish hot-bottom burning in massive AGB stars?
• The effects of near-core convective shells on the gravity modes of the subdwarf B pulsator KIC 10553698A
• The formation of type Ia supernovae from carbon-oxygen-silicon white dwarfs

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