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Published online by Cambridge University Press: 07 August 2017
Sh 2–71 appears to represent a diffuse, ellipsoidal nebulosity extending over a range Δα × Δδ = 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 Tz (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.