Atmospheric model and dynamical state of the atmosphere of the supergiant Eta Leonis (A0Ib)

Details Atmospheric model and dynamical state of the atmosphere of the supergiant Eta Leonis (A0Ib) Atmospheric model and dynamical state of the atmosphere of the supergiant Eta Leonis (A0Ib)

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..159l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 159-165.

Astronomy and Astrophysics

Astrophysics

13

Atmospheric Models, Magnetohydrodynamic Turbulence, Stellar Atmospheres, Supergiant Stars, Abundance, Photosphere, Shock Wave Propagation

Scientific paper

We redetermined the atmospheric model parameters of Eta/Leo (A0Ib) on the basis of a set of equivalent width data of 47 FeI and 71 FeII lines, determined by Wolf (1971). The procedure followed is an iterative one, involving the determination of the depth variation of microturbulence. We find: T(eff) = 10,200 K +/- 370; log g = 1.9 cm/s +/- 0,4 and Delta-logZ (= logarithmic abundances compared to the solar values) = 0.14 +/- 0.10 for Fe. A further result is that the line of sight microturbulence velocity component hardly varies with depth and equals 5.4 km/s +/- 0.7; hence the motion field, which consists of isothermal shock waves, obeys the 'limiting shockstrength regime. The observationally determined shock strength is 2.3.

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