detalle del documento
IDENTIFICACIÓN
oai:arXiv.org:2412.15984
Tema
Astrophysics - Solar and Stellar A...Autor
Werner, Klaus Reindl, Nicole Pritzkuleit, Max Geier, StephanCategoría
ciencias: astrofísica
Año
2024
fecha de cotización
25/12/2024
Palabras clave
pg1159 starResumen
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).
;Comment: Accepted by A&A
Werner, Klaus,Reindl, Nicole,Pritzkuleit, Max,Geier, Stephan, 2024, Three new hot hydrogen-deficient pre-white dwarfs
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