Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..192a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 1, Sept. 1991, p. 192-198.
Astronomy and Astrophysics
Astrophysics
12
Atmospheric Models, Shock Waves, Stellar Atmospheres, Supergiant Stars, Line Of Sight, Stellar Luminosity, Turbulence
Scientific paper
The depth dependence of microturbulent velocity in the atmosphere of alpha Carinae is examined by means of observational data from the 694 FeI and FeII lines. The model atmospheric parameters are expanded to include effective temperature, gravity, microturbulence, and abundance because the depth dependence is sensitive to the model atmosphere. The depth formation of the spectral lines is reviewed, and a method of linearization is applied to the analyses of both spectral lines and atmospheric parameters. The average microturbulent velocity component is 2.8 +/- 0.2 km/s, and the differences between the turbulent velocities are small for Fe lines that are neutral or singly ionized. Microturbulent velocity does not vary significantly with depth which suggests that the atmosphere of alpha Carinae obeys the limiting shock-strength regime.
Achmad L.
de Jager Cornelis
Nieuwenhuijzen Hans
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