A high-resolution spectroscopic study of southern T Tauri stars

Details A high-resolution spectroscopic study of southern T Tauri stars A high-resolution spectroscopic study of southern T Tauri stars

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..525f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 2, p. 525-532.

Astronomy and Astrophysics

Astrophysics

19

Stellar Spectrophotometry, T Tauri Stars, Line Spectra, Radial Velocity, Stellar Atmospheres, Stellar Envelopes, Stellar Rotation, Ubv Spectra

Scientific paper

We present the results of a high resolution spectroscopic study of five southern T Tauri stars: Sz 19, T Cha, Sz 68, Wa CrA/2, and TW Hya. The spectra cover a wavelength range of about 50 A centered on the Na I D lines. Simultaneous UBV(RI)c photometry was also obtained. Spectral types and projected rotational velocities have been derived by comparison with reference stars. Heliocentric radial velocities of the stars and their parent clouds have been determined. Night-to-night variability in the line profiles of T Cha and Sz 68 was detected. The Na I D profile of Sz 68 displays at least three systems of narrow blue-shifted absorption components in the Na I D lines with only the highest velocity one showing night-to-night variability in both intensity and width. This suggests a complex and unsteady circumstellar structure.

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