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Paper: Light Variations of the Anomalous Central Star of Planetary Nebula Sh 2-71
Volume: 361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics
Page: 469
Authors: Mikulasek, Z.; Skopal, A.; Zejda, M.; Pejcha, O.; Kohoutek, L.; Motl, D.; Vittone, A.A.; Errico, L.
Abstract: We present an analysis of light variations in UBV(RI)C of the anomalous object in the center of planetary nebula Sh 2-71. We refined the linear ephemeris of the light maxima to JDmax = 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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