On the formation of hydrogen-deficient low-mass white dwarfs
<i>Context</i>. 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. &...
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| Formato: | Articulo |
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2020
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/123742 |
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I19-R120-10915-123742 |
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dspace |
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Universidad Nacional de La Plata |
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I-19 |
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R-120 |
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SEDICI (UNLP) |
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Inglés |
| topic |
Ciencias Astronómicas Astronomía White dwarfs Asteroseismology Stars: evolution Stars: interiors Stars: oscillations Stars: low-mass |
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Ciencias Astronómicas Astronomía White dwarfs Asteroseismology Stars: evolution Stars: interiors Stars: oscillations Stars: low-mass Battich, Tiara Althaus, Leandro Gabriel Córsico, Alejandro Hugo On the formation of hydrogen-deficient low-mass white dwarfs |
| topic_facet |
Ciencias Astronómicas Astronomía White dwarfs Asteroseismology Stars: evolution Stars: interiors Stars: oscillations Stars: low-mass |
| description |
<i>Context</i>. 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.
<i>Aims</i>. 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.
<i>Methods</i>. 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.
<i>Results</i>. 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.
<i>Conclusions.</i> 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. |
| format |
Articulo Articulo |
| author |
Battich, Tiara Althaus, Leandro Gabriel Córsico, Alejandro Hugo |
| author_facet |
Battich, Tiara Althaus, Leandro Gabriel Córsico, Alejandro Hugo |
| author_sort |
Battich, Tiara |
| title |
On the formation of hydrogen-deficient low-mass white dwarfs |
| title_short |
On the formation of hydrogen-deficient low-mass white dwarfs |
| title_full |
On the formation of hydrogen-deficient low-mass white dwarfs |
| title_fullStr |
On the formation of hydrogen-deficient low-mass white dwarfs |
| title_full_unstemmed |
On the formation of hydrogen-deficient low-mass white dwarfs |
| title_sort |
on the formation of hydrogen-deficient low-mass white dwarfs |
| publishDate |
2020 |
| url |
http://sedici.unlp.edu.ar/handle/10915/123742 |
| work_keys_str_mv |
AT battichtiara ontheformationofhydrogendeficientlowmasswhitedwarfs AT althausleandrogabriel ontheformationofhydrogendeficientlowmasswhitedwarfs AT corsicoalejandrohugo ontheformationofhydrogendeficientlowmasswhitedwarfs |
| bdutipo_str |
Repositorios |
| _version_ |
1764820450164080640 |