Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...195..631s&link_type=abstract
Astrophysical Journal, vol. 195, Feb. 1, 1975, pt. 1, p. 631-642.
Astronomy and Astrophysics
Astrophysics
171
Gas Ionization, Nebulae, Stellar Envelopes, Stellar Winds, T Tauri Stars, Emission Spectra, H Alpha Line, Molecular Excitation, Radial Velocity, Shock Wave Propagation, Stellar Spectra
Scientific paper
Radial velocities of the emission nebulae and NGC 1555 (Hind's Reflection Nebula) which are associated with T Tau suggest the presence of extended mass outflow which is supersonic with respect to the medium in which the star is embedded. It is suggested that radiating shocks may form where the flow interfaces with the intracloud medium, producing emission spectra similar to that predicted by the shock-wave models of Cox. An electron density and temperature analysis based upon the relative intensities of the near-infrared and blue lines of forbidden O II in Burnham's Emission Nebula supports the shock wave hypothesis. The character of the emission-line spectrum, the small filling factor, and the energy balance requirements of the system are also compatible with the hypothesis. The Herbig-Haro Nebulae, if produced by the same mechanism, must involve central objects with a considerably higher rate of mass outflow than is indicated for T Tau.
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