Optical monitoring of Orion population stars. I - Results for some T Tauri and Herbig Ae/Be stars

Details Optical monitoring of Orion population stars. I - Results for some T Tauri and Herbig Ae/Be stars Optical monitoring of Orion population stars. I - Results for some T Tauri and Herbig Ae/Be stars

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1710h&link_type=abstract

Astronomical Journal, vol. 87, Dec. 1982, p. 1710-1729.

Astronomy and Astrophysics

Astronomy

50

A Stars, B Stars, Stellar Spectra, Stellar Spectrophotometry, T Tauri Stars, H Alpha Line, Hertzsprung-Russell Diagram, Light Curve, Orion Constellation, Stellar Luminosity

Scientific paper

A program of monitoring Orion population variables with the Perkin telescope at Van Vleck Observatory is described. In the first season, we have obtained UBVRI and Hα (30 and 150-Å) bandpasses) data for seven Herbig Ae/Be stars and five T Tauri stars. All of the T Tauri stars showed significant variations in U which, for the most part, correlated with changes in Hα flux. In addition, three of the stars (SU Aur, RW Aur, and CO Ori) exhibited substantial variations at all wavelengths. In all cases, the stars become redder when fainter. The weak emission-line stars (SU Aur and CO Ori) showed an increase in Hα equivalent width when faint, which was primarily caused by the fading of the continuum. If their variations are caused by changes in a circumstellar dust shell, then the dust must be obscuring the photosphere without obscuring the Hα-emitting region. In RW Aur, the changes at all wavelengths from U to I correlate well wit Hα flux, suggesting a "chromospheric" origin. None of the Herbig Ae/Be stars studied showed substantial variation in magnitude or Hα strength.

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