Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..222c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 222-228.
Astronomy and Astrophysics
Astrophysics
24
Pre-Main Sequence Stars, Radiative Transfer, Resonance Lines, Star Formation, Stellar Mass Ejection, Stellar Winds, A Stars, B Stars, Chromosphere, Ionizing Radiation, O Stars, Stellar Atmospheres
Scientific paper
The author presents the results of a detailed computation of the C IV resonance lines in the pre-main-sequence Herbig Ae star AB Aur. He has used the equivalent-two-level-atom approach to solve the radiative transfer and statistical equilibrium equations for the multi-level atomic structure of the C III-C IV-C V system. The radiative transfer equation is solved in the co-moving frame of the flow. Intense absorption lines are obtained with a model that includes a moderate temperature (17000K), expanding chromosphere. The semi-empirical model built for AB Aur from previous analysis can therefore explain the observed shape of the C IV resonance lines. The present analysis allows new constraints to be placed on the structure of AB Aur's chromosphere. Its maximum temperature is between 16000 and 18000K, and 2.5 stellar radii constitutes an upper limit for its extension.
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