Light Variations of the Anomalous Central Star of Planetary Nebula Sh 2-71

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Authors

MIKULÁŠEK Zdeněk SKOPAL Augustin ZEJDA Miloslav PEJCHA Ondřej KOHOUTEK Luboš MOTL David VITTONE A. A. ERRICO L.

Year of publication 2005
Type Article in Proceedings
Conference Active OB-Stars: Laboratories for Stellare and Circumstellar Physics, Proceedings of the conference held 29 August - 2 September, 2005 at Hokkai-Gakuen University, Sapporo, Japan
MU Faculty or unit

Faculty of Science

Citation
Field Astronomy and astrophysics
Keywords planetary nebulae; variable stars
Description 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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