Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1709m&link_type=abstract
Astronomical Journal, vol. 84, Nov. 1979, p. 1709-1712.
Astronomy and Astrophysics
Astronomy
7
Interstellar Gas, Ionized Gases, Ionizing Radiation, Microwave Emission, T Tauri Stars, Ultraviolet Radiation, H Alpha Line, Radio Sources (Astronomy), Shock Wave Propagation, Stellar Radiation, X Ray Sources
Scientific paper
Upper limits to the amounts of ionized gas in extended regions (r equal to or greater than 10 to the 14th cm) around T Tau stars are derived from upper limits to the 10.5-GHz, 8.0-GHz, and 5.0-GHz continuum flux densities. The star T Tau itself was marginally detected. The implications of other recent observations related to physical processes in the extended circumstellar environment of T Tau are briefly discussed, with emphasis on the possible role that ionizing radiation from a high-velocity shock may have in the excitation of gas outside the shocked region. It is suggested that ultraviolet radiation from 200-km/s shocks near the star may be responsible for pumping the v = 1-0 S(1) infrared transition of H2 in T Tau and that soft X-rays from the shocks partially ionize the surrounding region, as suggested by the anomalous forbidden O I 6300-A to H-alpha line ratio.
Brown Raymon L.
Hobbs Richard W.
Jura Michael
Knapp Gillan R.
Maran Stephen P.
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