Work

Three new hot hydrogen-deficient pre-white dwarfs

Year: 2024

Type: preprint

Abstract: 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).

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2412.15984

Authors: Werner, Klaus, Reindl, Nicole, Pritzkuleit, Max, Geier, Stephan

Institutions: University of Tübingen, Heidelberg University, University of Potsdam

Language: English

Topic: Stellar, planetary, and galactic studies

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Aeronautics and Space Administration, European Space Agency, Deutsche Forschungsgemeinschaft

Award: G6795133306

OpenAlex ID: W4405715682

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