The He II 4686 line as an indicator of the nature of emission-line regions in T Tau type stars

Details The He II 4686 line as an indicator of the nature of emission-line regions in T Tau type stars The He II 4686 line as an indicator of the nature of emission-line regions in T Tau type stars

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989azh....66.1330l&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 66, Nov.-Dec. 1989, p. 1330-1334. In Russian.

Astronomy and Astrophysics

Astronomy

8

Emission Spectra, Helium, Stellar Spectra, T Tauri Stars, Accretion Disks, Astronomical Models, Astronomical Spectroscopy, Chromosphere, Optical Thickness, Spectral Line Width

Scientific paper

It is shown that, in the case of T Tau type stars, the He II 4686 line is optically thin and can be used to obtain information about the nature of the hot (T not less than 30,000 K) regions. Profiles of this line are calculated for three hot-region models: the chromosphere, the accretion disk, and the chromosphere above the disk. A choice between these models can be made by studying the profiles of the He II 4686 line from spectrograms with a resolution of about 20 km/s.

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