Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jkas...19...15p&link_type=abstract
Journal of Korean Astronomical Society, vol. 19, no. 1, p. 15-31
Astronomy and Astrophysics
Astronomy
Scientific paper
We have analyzed Gray's observed mean line bisectors of F5, G0, G2, and G5 normal dwarf stars and interpreted them by computing theoretical line bisectors based on a two stream model. A set of perturbed models has been derived, and their detailed structures on temperature fluctuations and velocity fields are presented as a function of depth, which account for the observed bisectors. From the present study, it is found that the degree of stellar convective over-shootings and temperature fluctuations in the upper atmospheres increases towards earlier spectral types. The convection cell size inferred from these models is found to increase also with the advancing earlier type. We demonstrated the usefulness of line bisector analysis as a diagnostic probe for stellar convection.
Park Yong Sun
Yun Hong Sik
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