Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141..304d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 2, Dec. 1984, p. 304-308.
Astronomy and Astrophysics
Astronomy
26
Atmospheric Turbulence, Photosphere, Stellar Atmospheres, Supergiant Stars, Atmospheric Models, High Resolution, Line Spectra, Near Ultraviolet Radiation, Ultraviolet Astronomy
Scientific paper
Two high-resolution near-ultraviolet spectra of the supergiant α Cyg have been analyzed with the aim of determining the average microturbulent line-of-sight velocity component which was found to be 15.0±0.5 km s-1. This value is close to the local sound velocity (13.7 km s-1). This result, together with previous determinations in the visual spectral region, is consistent with the picture that shock waves are the dominant structure in the outer photosphere of Deneb. The macroturbulent velocity component is ≈10 km s-1, a factor two to four smaller than earlier communicated values for the line of sight components of the stochastic macroturbulent velocities.
de Jager Cornelis
Kondo Yoshihiko
Mulder P. S.
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