Spectral energy distributions of young stellar objects. I - A turbospheric model for DR Tauri

Details Spectral energy distributions of young stellar objects. I - A turbospheric model for DR Tauri Spectral energy distributions of young stellar objects. I - A turbospheric model for DR Tauri

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..199u&link_type=abstract

Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 199-206.

Astronomy and Astrophysics

Astrophysics

22

Magnetohydrodynamic Turbulence, Spectral Energy Distribution, Stellar Atmospheres, Stellar Models, Stellar Spectrophotometry, T Tauri Stars, Chromosphere, Hydrogen Plasma, Kinetic Equations, Stellar Luminosity, Stellar Mass, Stellar Mass Accretion, Stellar Temperature

Scientific paper

A turbospheric model is developed for the spectral energy distribution of the active T Tauri star DR Tau which incorporates a reddened optically thin hydrogen plasma at 65,000 K. Measurements of the spectral energy distribution covering the range 3200 A to 1.1 micron are shown to agree in detail with the model results. It is proposed that the temperature of 65,000 K is a result of equipartition between the particle kinetic energy density of the plasma and the kinetic energy density of strong turbulence which forms a chromosphere-like layer, called a turbosphere. It is suggested that the turbulence is driven by the accretion of cometary clumps at a rate of 5 x 10 to the -7th solar masses/year. Results of the model calculations give the following overall parameters for DR Tau: M = 1 solar mass, R = 3 solar radii, and L = 6 solar luminosities. The turbosphere is characterized by: T = 65,000 K, Ne = 5 x 10 to the 12th/sq cm, and an atmospheric thickness layer = 4 x 10 to the 9th cm.

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