Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195..218b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 218-225.
Astronomy and Astrophysics
Astrophysics
14
Atmospheric Turbulence, Cygnus Constellation, Stellar Atmospheres, Supergiant Stars, Ultraviolet Spectra, Line Of Sight, Near Ultraviolet Radiation, Radial Velocity, Stellar Mass
Scientific paper
High resolution near-ultraviolet spectra of α Cygni (λ/Δλ = 8×104) were studied to investigate the dynamical state of the atmosphere. The microturbulent line-of-sight velocity component is found to be constant (10.3±0.7 km s-1) over a large range of optical depths (-4 < log τc < -1). The macroturbulent velocity distribution is double-peaked at velocities, both positive and negative, of 14±2 km s-1, suggesting preponderantly up- and downward moving elements (convective?). These motions may explain the non-radial pulsations found by Lucy (1976). The outward turbulent acceleration in the outer layers of the atmosphere is 7.6 cm s-2, yielding a gravitational acceleration of 26.0 cm s-2, and a stellar mass of 18 M_sun;. The authors also derive a new value for vr sin i (8±3 km s-1).
Boer Berto
de Jager Cornelis
Nieuwenhuijzen Hans
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