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Evidence for a supersonic turbulent velocity gradient in the outer photosphere of the supergiant alpha Cygni (A2Ia)The balloon-borne UV Stellar Spectrometer's high resolution, near-UV spectra of the supergiant Alpha Cyg are subjected to analysis in order to determine the average microturbulent line-of-sight velocity component. A value of 15.0 + or - 0.5 km/sec is obtained, which is close to the 13.7 km/sec local sound velocity, and is consistent with the view that shock waves are the dominant structure in the outer photosphere of Deneb, so that shock wave dissipation determines the thermal structure of the photosphere.
Document ID
19850038178
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
De Jager, C.
(Utrecht State Univ. Netherlands)
Mulder, P. S.
(Utrecht Rijksuniversiteit, Utrecht, Netherlands)
Kondo, Y.
(NASA Goddard Space Flight Center Laboratory for Astronomy and Solar Physics, Greenbelt, MD, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1984
Publication Information
Publication: Astronomy and Astrophysics
Volume: 141
Issue: 2, De
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
85A20329
Distribution Limits
Public
Copyright
Other

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