Sh 2-71 may be a planetary nebula shaped by a triple-star system that broke apart when the nebula-forming star lost its envelope.
Light Variations of the Anomalous Central Star of Planetary Nebula Sh 2-71
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abstract
We present an analysis of light variations in UBVRI of the anomalous object in the center of planetary nebula Sh 2-71. We refined the linear ephemeris of the light maxima to JD{max} = 2449862.0 + 68.101 (E-96), but also identified long-term, obviously non-periodic variations. The latter manifest themselves in large O-C shifts, a variable profile of light curves (hereafter LC) and changes in the mean brightness of the object. Our spectroscopic observations suggested the presence of a superdense nebula in the center of Sh 2-71.
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On the triple-star origin of the planetary nebula Sh 2-71
Sh 2-71 may be a planetary nebula shaped by a triple-star system that broke apart when the nebula-forming star lost its envelope.