Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223..509b&link_type=abstract
Astrophysical Journal, Part 1, vol. 223, July 15, 1978, p. 509-525.
Astronomy and Astrophysics
Astronomy
11
Early Stars, F Stars, Hot Stars, Main Sequence Stars, Spectral Energy Distribution, Ultraviolet Astronomy, A Stars, Atmospheric Models, Continuous Spectra, Interstellar Extinction, Pleiades Cluster, Stellar Rotation
Scientific paper
Scanner observations of A and F main-sequence stars are examined in order to check whether the observed continuum energy distributions match scaled Bilderberg models and whether some influence of rotation on convection can be detected. The continuum energy distributions of A and F field stars and of stars in different clusters with different rotational velocities are compared; the clusters include the Hyades, Praesepe, Coma, Alpha Persei, and the Pleiades. A comparison with radiative-equilibrium model-atmosphere computations reveals some UV flux reduction for many stars with B-V greater than 0.14 and a strong UV flux reduction for all stars with B-V greater than 0.22, regardless of rotational velocity. The energy distributions are found to match the scaled Bilderberg models, and this is attributed to a reduced temperature gradient in convectively unstable layers. It is shown that rotation does not impede convection, but even seems to enhance it, contrary to expectations.
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