Two white dwarfs with oxygen-rich atmospheres

Preprint, Article English OPEN
Gaensicke, B. T. ; Koester, Detlev ; Girven, Jonathan ; Marsh, T. R. ; Steeghs, D. (2010)
  • Publisher: American Association for the Advancement of Science
  • Related identifiers: doi: 10.1126/science.1180228, doi: 10.1126/science.1180228
  • Subject: Astrophysics - Solar and Stellar Astrophysics | QB | Astrophysics - Astrophysics of Galaxies
    arxiv: Astrophysics::Galaxy Astrophysics | Astrophysics::Cosmology and Extragalactic Astrophysics | Astrophysics::Earth and Planetary Astrophysics | Astrophysics::Solar and Stellar Astrophysics

Stars with masses ranging from 7 to 10 times the mass of the Sun end their lives either as massive white dwarfs or weak type II supernovae, but there are only limited observational constraints on either evolutionary channel. Here we report the detection of two white dwarfs with large photospheric oxygen abundances, implying that they are bare oxygen-neon cores and that they may have descended from the most massive progenitors that avoid core collapse.\ud
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