2020/03/31 by Tiara Battich, Leandro G. Althaus, Alejandro H. Córsico · 3 citations
Physics and Astronomy · Social Sciences · #Asteroseismology #Astronomy and Astrophysical Research #Context (archaeology) #Educational Leadership and Practices #Instability #Instability strip #Pulse (music) #Stellar evolution #Stellar, planetary, and galactic studies #Thermal #White dwarf #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/202037743
published in Astronomy and Astrophysics 638, A30 (EDP Sciences) · 7 pages, 7 figures. Accepted for publication in A&A
arxiv created 2020/03/31 · openalex created_date 2020/04/03 · openalex publication_date 2020/05/07 · arxiv updated 2020/07/01 · openalex updated_date 2026/08/05
Context. Two of the possible channels for the formation of low-mass ( M ⋆ ≲ 0.5 M ⊙ ) hydrogen-deficient white dwarfs are the occurrence of a very-late thermal pulse after the asymptotic giant-branch phase or a late helium-flash onset in an almost stripped core of a red giant star. Aims. We aim to asses the potential of asteroseismology to distinguish between the hot flasher and the very-late thermal pulse scenarios for the formation of low-mass hydrogen-deficient white dwarfs. Methods. We computed the evolution of low-mass hydrogen-deficient white dwarfs from the zero-age main sequence in the context of the two evolutionary scenarios. We explore the pulsation properties of the resulting models for effective temperatures characterizing the instability strip of pulsating helium-rich white dwarfs. Results. We find that there are significant differences in the periods and in the period spacings associated with low radial-order ( k ≲ 10) gravity modes for white-dwarf models evolving within the instability strip of the hydrogen-deficient white dwarfs. Conclusions. The measurement of the period spacings for pulsation modes with periods shorter than ∼500 s may be used to distinguish between the two scenarios. Moreover, period-to-period asteroseismic fits of low-mass pulsating hydrogen-deficient white dwarfs can help to determine their evolutionary history.