Radial velocities and spectral types of T Tauri stars

Details Radial velocities and spectral types of T Tauri stars Radial velocities and spectral types of T Tauri stars

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..747h&link_type=abstract

Astrophysical Journal, Part 1, vol. 214, June 15, 1977, p. 747-758. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

242

Interstellar Gas, Nebulae, Radial Velocity, Stellar Spectra, T Tauri Stars, Absorption Spectra, Classifications, Frequency Distribution, Line Spectra, Spectrum Analysis, Standard Deviation, Stellar Motions, Tables (Data)

Scientific paper

The paper presents measurements of the absorption-line radial velocities of about 50 T Tauri stars on spectrograms covering the spectral region from 5850 to 6700 A with a dispersion of 34 A/mm. Emission-line velocities are examined along with absorption reversals in H-alpha, and the forbidden lines observed in several spectra. Spectral classifications are given for all the T Tauri stars observed, and the frequency distribution of types in the Taurus-Auriga dark nebulae (Tau-Aur) is analyzed. It is concluded that: (1) the absorption-line velocities of these stars are the same, within the errors of measurement, as the velocities of the molecular clouds upon which they are projected: (2) there is no evidence that newly formed stars are systematically being ejected from the nebula; (3) red emission lines yield velocities that are, in the mean, not far from the absorption line values; (4) the spectral types of the Tau-Aur stars range from early G to about M4, with a frequency peak near M0, and almost all these stars are of luminosity class V.

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