Computer Science – Sound
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jphys..49..383b&link_type=abstract
(IAU, ESA, CNRS, et al., Colloquium on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, 102nd, Beaulieu-sur-Me
Computer Science
Sound
1
Cygnus Constellation, Stellar Atmospheres, Supergiant Stars, Ultraviolet Spectra, Atmospheric Turbulence, Gravitational Effects, High Resolution, Spectral Line Width, Stellar Luminosity, Velocity Distribution
Scientific paper
In order to study the apparent near-instability of supergiant atmospheres, high-resolution BUSS (Balloon-borne Ultraviolet Stellar Spectometer) spectra of the supergiant Alpha Cyg have been investigated. Equivalent widths of lines yield the variation of the line-of-sight microturbulent velocity component zeta(mu) with optical depth tau. At tau(5) = 0.1, zeta(mu) equal to the velocity of sound is found. The consequent turbulent acceleration is directed outward. It increases outward and is about half the effective acceleration at tau(5) = 0.01. The macroturbulent velocity profile is double peaked with upward and downward velocities of 14 km/s. It is suggested that these motions are stochastic pulsations of large elements. At any time there are 30 to 40 such elements on the visible disk.
Boer Berto
de Jager Cornelis
Nieuwenhuijzen Hans
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