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Recent Observations of the Highly Variable Stab DR Tau

  • C. Bertout (a1), J. Krautter (a1), C. Möllenhoff (a1) and B. Wolf (a1)

Abstract

Simultaneous spectroscopic and photometric observation of the T Tau-like star DR Tau are reported. The spectrograms show a rich emission spectrum. The Balmer lines are strongly variable. They sometimes show a highly complex structure, and inverse P Cygni profiles were observed on two nights. The metallic lines are essentially undisplaced. Simultaneous photometry indicates irregular variations of the blue continuum by as much as 0.5 magnitude on a time-scale of one day and variations of more than two magnitudes on a time-scale of a few days. The observed spectral properties can be explained by assuming that DR Tauri is a protostar of about 1 M which has not yet reached its hydrostatic equilibrium Hayashi track.

A more complete description of our results is in press in Astronomy and Astrophysics.

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