Photospheric velocity fields in Tau Scorpii

Details Photospheric velocity fields in Tau Scorpii Photospheric velocity fields in Tau Scorpii

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..522s&link_type=abstract

Astrophysical Journal, Part 1, vol. 219, Jan. 15, 1978, p. 522-531.

Astronomy and Astrophysics

Astrophysics

35

Convective Heat Transfer, Photosphere, Radiation Pressure, Stellar Atmospheres, Stellar Models, Stellar Winds, Velocity Distribution, Line Spectra, Main Sequence Stars, Radial Flow, Stellar Mass Ejection, Stellar Spectra

Scientific paper

Fourier analysis of high-resolution photoelectric profiles of Tau Scorpii indicates a 5 km/sec rotational velocity and a 6 km/sec radial-tangential macroturbulence for the photospheric velocity field of the hot star. A value of 3 km/sec for the microturbulence results from analysis of strong and weak line profiles. Slightly depressed blue wings observed in nearly all the lines are explained as the product of a subphotospheric convection velocity field (produced by He II ionization) that initiates an acceleration of matter which is sustained by radiative pressure.

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