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HE 1327-2326, An Unevolved Star with [Fe/H] < -5.0. III. Does its Atmosphere Reflect its Natal Composition?

Korn, A J; Richard, O.; Mashonkina, L; Bessell, Michael; Frebel, Anna; Aoki, Wako

Description

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]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
URI: http://hdl.handle.net/1885/18850
Source: Astrophysical Journal, The
DOI: 10.1088/0004-637X/698/1/410

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