Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991acaps..11..248h&link_type=abstract
(Acta Astrophysica Sinica, vol. 11, no. 3, 1991, p. 248-254) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 15, Dec.
Astronomy and Astrophysics
Astrophysics
1
Astronomical Photography, Eclipses, Light Curve, Planetary Nebulae, Periodic Variations, Stellar Magnitude
Scientific paper
Results are presented from photographic observations carried out between 1981 and 1987 of the central star in the NGC 2346 planetary nebula, the AGK -0 deg 695 star. It was found that, starting at the end of 1981, there occurred several large-amplitude eclipses which continued for several years, after which the amplitude began to decrease rapidly, from about 4 mag in 1984 to about 1.1 mag in 1986, and was finally reduced to about 0.4-mag fluctuations in 1987. It is suggested that the cause of the unexpected eclipses in NGC 2346 was an ejection of matter from hot regions of the surface of the sdO star. As the ejected matter encountered the cold cloud around the nebula, it was cooled to dust particles, forming an optically thick cloudlets spread over the binary orbit.
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