The effect of macroscopic motions on spectral-line shapes

Details The effect of macroscopic motions on spectral-line shapes The effect of macroscopic motions on spectral-line shapes

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..294k&link_type=abstract

Astrophysical Journal, Part 1, vol. 236, Feb. 15, 1980, p. 294-299.

Astronomy and Astrophysics

Astrophysics

2

Atmospheric Turbulence, Line Shape, Line Spectra, Stellar Atmospheres, Stellar Spectra, Turbulence Effects, Fourier Transformation, Photosphere, Spectral Line Width, Stellar Rotation

Scientific paper

The effect of macroscopic motions on spectral-line shapes is examined. The convolution method with a disk-integrated broadening function which ignores only the effects of limb darkening is used to approximate the effects of macroturbulence; it was shown that the flux can be computed from the broadened specific intensity profiles by convolving the intrinsic specific intensity with a velocity distribution function if there is a large number of macroturbulence cells on the disk of the star. As an example, the Fourier method proposed by Ebbetts (1978) is studied for determining of photospheric expansion velocities, showing that the procedure is so sensitive to the selection of an arbitrary zero point that it is not practical.

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