Korn, A J; Richard, O.; Mashonkina, L; Bessell, Michael; Frebel, Anna; Aoki, Wako
Based on spectroscopic constraints derived from nonlocal thermodynamic equilibrium line formation, we explore the likely range of stellar parameters (Teff and log g) for the hyper-metal-poor (HMP) star HE 1327-2326. Combining the constraints from Balmer line profiles and the Ca I/II ionization equilibrium, a subgiant stage of evolution is indicated. This result is further supported by spectrophotometric observations of the Balmer jump. If a higher Teff value was used (as favored by some...[Show more]
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