A study of the physical variability of planetary nebulae - Average run of photoelectric UBV magnitudes of seven planetary nebulae over 20 years of observations (1968-1988)

Details A study of the physical variability of planetary nebulae - Average run of photoelectric UBV magnitudes of seven planetary nebulae over 20 years of observations (1968-1988) A study of the physical variability of planetary nebulae - Average run of photoelectric UBV magnitudes of seven planetary nebulae over 20 years of observations (1968-1988)

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pazh...16.1085k&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 16, Dec. 1990, p. 1085-1094. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

3

Astronomical Photometry, Electrophotometry, Planetary Nebulae, Stellar Luminosity, Ubv Spectra, Annual Variations, Star Clusters

Scientific paper

Photoelectric ubv magnitudes, based on twenty years of observations, are given for seven planetary nebulae: NGC 6572, IC 4997, Hu 2-1, NGC 6891, NGC 6720, IC 3568, NGC 6543, to study their variability. The results are given in a catalogue including integral ubv magnitudes for nebulae in relation to reference stars, averaged over every observing season from 1968 to 1988. Five nebulae, NGC 6572, IC 4997, Hu 2-1, NGC 6891 and NGC 6543, proved to be variable in the range 0.2 - 0.6 m, while NGC 6720 and IC 3568 showed no changes in integral ubv brightness exceeding 0.1 m. Most interesting is the young starlike planetary nebula IC 4997, which showed in 1968-1985 a reduction in integral ubv brightness of 0.2 - 0.6 m. In 1985-1986 this reduction stopped, followed by a gradual increase. Study of the spectrum of this nebula suggests that the photometric and spectral changes revealed reflect a change in the radiation field of the central star.

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