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Ultraviolet Photometric Variations in the Central Star of IC 418
Published online by Cambridge University Press: 22 September 2016
Extract
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
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- Copyright © Reidel 1978