Light Variations of the Anomalous Central Star of Planetary Nebula Sh 2-71
Zdenek Mikulasek, Augustin Skopal, Miloslav Zejda, Ondrej Pejcha, Lubos Kohoutek, David Motl, A. A. Vittone, L. Errico
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 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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