Photospheric velocity fields in the O-type stars

Details Photospheric velocity fields in the O-type stars Photospheric velocity fields in the O-type stars

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..510e&link_type=abstract

Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 510-518.

Other

31

Atmospheric Turbulence, O Stars, Photosphere, Spectral Line Width, Stellar Atmospheres, Stellar Spectra, Supergiant Stars, Balmer Series, Early Stars, Fourier Transformation, Line Spectra, Radial Velocity, Spectrum Analysis, Stellar Rotation, Stellar Winds

Scientific paper

The longstanding problem of line-broadening mechanisms in early-type stars has been reinvestigated. By analyzing either the He I 4471-A or the He II 4541-A line in both the wavelength and Fourier-transform domains, it is possible to measure the rotation and macroturbulence separately in individual stars. When the macroturbulence is assumed to have a Gaussian form, a velocity dispersion of about 30 km/s is found for the supergiants, but little or no turbulence is observed in the main-sequence stars. Radial-velocity measurements show a significant progression in the hydrogen Balmer lines for the supergiants, but no such effect is seen in the main-sequence stars. The turbulence and Balmer progression correlate well with each other, and with the stellar-wind velocities observed in the ultraviolet.

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