Large turbulent elements in supergiant photospheres

Details Large turbulent elements in supergiant photospheres Large turbulent elements in supergiant photospheres

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..62..245d&link_type=abstract

Astrophysics and Space Science, vol. 62, no. 1, May 1979, p. 245-250.

Astronomy and Astrophysics

Astrophysics

7

Photosphere, Stellar Luminosity, Supergiant Stars, Turbulence, Astrophysics, Stellar Evolution, Stellar Spectra, Vortices

Scientific paper

During the 1973 'cool phase' of the very overluminous supergiant HR 8752, when the star's spectral type was K2...K5 Ia+, the most probable vertical extent of the main turbulent elements in the star's photosphere was about 6 times the density scale height, which is about half the stellar radius (R). In early-type photospheres (class Ia) it is about 10 times the atmospheric density scale height (about 0.25 R), while in underluminous (class Ib) supergiants the most probable vertical extent of the elements is approximately 8 times the density scale height (approximately 0.05 R). Large turbulent elements are apparently a common feature in supergiant photospheres; the more extreme the supergiant, the larger the relative size of the eddies.

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