Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....63..297g&link_type=abstract
Astronomy and Astrophysics, vol. 63, no. 1-2, Feb. 1978, p. 297-301. Research sponsored by the Koninklijke Nederlandse Akademie
Astronomy and Astrophysics
Astronomy
14
Astronomical Spectroscopy, Planetary Nebulae, Stellar Evolution, Ultraviolet Photometry, Variable Stars, Astronomical Netherlands Satellite, Periodic Variations, Spaceborne Astronomy
Scientific paper
UV photometric observations of 39 planetary nebulae performed with the Astronomical Netherlands Satellite have been searched for variability of the central stars. No photometric variations of more than about 15% are found, but detectable variations are observed in the nuclei of five objects: IC 418, NGC 6543, A78, He2-131, and V-V 1-7. The results indicate that: (1) the only definite variations occurred in emission-line central stars with Of characteristics; (2) the variations in A78, NGC 6543, and He2-131 may be entirely spectroscopic in origin; (3) the variations in IC 418 appear to be both spectroscopic and photometric; and (4) V-V 1-7 is probably not a planetary nebula.
Gilra Daya P.
Pottasch Stuart R.
van Duinen R. J.
Wesselius R.. P.
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