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Ultraviolet Photometric Variations in the Central Star of IC 418

Published online by Cambridge University Press:  22 September 2016

D.P. Gilra ,
S.R. Pottasch ,
P.R. Wesselius  and
R.J. Van Duinen
D.P. Gilra
Affiliation:
University of Groningen, The Netherlands
S.R. Pottasch
Affiliation:
University of Groningen, The Netherlands
P.R. Wesselius
Affiliation:
University of Groningen, The Netherlands
R.J. Van Duinen
Affiliation:
University of Groningen, The Netherlands

Extract

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Ultraviolet photometric observations of IC 418 taken with the Netherlands Astronomical Satellite (ANS) indicate variability in the central star brightness. The variations occurring on the time scales of 5 hours are only 4% at 3300 Å but increase to about 15% at 1550 Å. The observations were not made frequently enough to determine a periodicity, if one exists. There are also 5–10% changes in brightness observed in A78 and NGC 6543, these are probably due to spectral changes in the central star spectra. About 10% type variations were found in VV 1–7 and He 2–131 but their interpretation is not clear.

Type
Session IV: The Central Stars of Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 76: Planetary Nebulae , 1978 , pp. 210
Copyright
Copyright © Reidel 1978