The disappearance of eclipses in the central star of the planetary nebula NGC 2346 |
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| Authors: | Hao Xiang-liang |
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| Institution: | Beijing Astronomical Observatory, Chinese Academy of Sciences, China |
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| Abstract: | This paper gives the result of photographic photography of the central star AGK3-0° 695 of the planetary nebula NGC 2346 made from 1981 through 1987. From it we see that after the large-amplitude eclipses which had started at the end of 1981 had continued for several years, the amplitude began to decrease rapidly in 1986 to ?1.1 mag from ?4 mag in 1984. In 1987, only irregular fluctuations with amplitudes ?0.4 mag were present in the light curve and not longer any clear periodicity. A preliminary analysis of this phenomenon is carried out here. |
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| Keywords: | Planetary nebulae—light variation |
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