Three new hot hydrogen-deficient pre-white dwarfs
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866929642596728832 |
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| author | Werner, Klaus Reindl, Nicole Pritzkuleit, Max Geier, Stephan |
| author_facet | Werner, Klaus Reindl, Nicole Pritzkuleit, Max Geier, Stephan |
| contents | We have detected three new hydrogen-deficient (H < 0.001 mass fraction) pre-white dwarfs (WDs) with helium-dominated atmospheres. The first object is a relatively cool PG1159 star (effective temperature Teff = 72,000 K) that has the lowest surface gravity of any PG1159 star known (log g = 4.8). It is a PG1159 star in the earliest pre-WD phase. The second object is a hot subdwarf O (sdO) star (Teff = 50,000 K, log g = 5.3) with high carbon and oxygen abundances. It is only the third known member of the recently established CO-sdO spectral class, which comprises stars that are thought to be formed by a merger of a disrupted low-mass CO WD with a higher-mass He WD. The third object is one of the rare stars of spectral type O(He) (Teff = 90,000 K, log g = 5.5). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15984 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Three new hot hydrogen-deficient pre-white dwarfs Werner, Klaus Reindl, Nicole Pritzkuleit, Max Geier, Stephan Solar and Stellar Astrophysics We have detected three new hydrogen-deficient (H < 0.001 mass fraction) pre-white dwarfs (WDs) with helium-dominated atmospheres. The first object is a relatively cool PG1159 star (effective temperature Teff = 72,000 K) that has the lowest surface gravity of any PG1159 star known (log g = 4.8). It is a PG1159 star in the earliest pre-WD phase. The second object is a hot subdwarf O (sdO) star (Teff = 50,000 K, log g = 5.3) with high carbon and oxygen abundances. It is only the third known member of the recently established CO-sdO spectral class, which comprises stars that are thought to be formed by a merger of a disrupted low-mass CO WD with a higher-mass He WD. The third object is one of the rare stars of spectral type O(He) (Teff = 90,000 K, log g = 5.5). |
| title | Three new hot hydrogen-deficient pre-white dwarfs |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2412.15984 |