An analysis of the photospheric line profiles in F, G, and K supergiants

Details An analysis of the photospheric line profiles in F, G, and K supergiants An analysis of the photospheric line profiles in F, G, and K supergiants

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..360g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. 360-367. NSERC-supported research.

Astronomy and Astrophysics

Astrophysics

42

F Stars, G Stars, K Stars, Line Shape, Photosphere, Supergiant Stars, Atmospheric Turbulence, Fourier Analysis, Spectral Line Width, Stellar Luminosity, Stellar Rotation, Stellar Spectrophotometry

Scientific paper

The spectral-line broadening for 30 F, G, and K Ib supergiants has been measured. Fourier analysis for macroturbulence and rotation shows (1) macroturbulent velocities larger than but compatible with values found for lower luminosity stars and (2) rotation results that cannot be fully explained. Three plausible scenarios are suggested, but the one in which angular momentum of the surface 'shell' is conserved during the evolutionary changes experienced by these stars is favored. The unusual distribution of rotation velocities may result from a preferential alignment of rotation axes with the galactic poles.

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