Collimating Discs and Bipolar Flows in Sh 2–71

Sh 2-71 appears to represent a diffuse, ellipsoidal nebulosity extending over a range △α x △δ = 1.7 × 3 arcmin2. Early spectroscopy by Glushkov et al (1975), and Chopinet and Lortet-Zuckerman (1976) suggested the presence of a high excitation central star, and Kaler (1983) has more recently determined Zanstra temperatures T z (HeII) > 7.7 · 104 K. The observed central star clearly constitutes a much cooler companion, and luminosity variations in this source have been attributed to binary eclipse.