Photoelectric filter photometry of planetary nebulae

Details Photoelectric filter photometry of planetary nebulae Photoelectric filter photometry of planetary nebulae

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210..113k&link_type=abstract

Astrophysical Journal, vol. 210, Nov. 15, 1976, pt. 1, p. 113-119. Research supported by the John Simon Guggenheim Memorial Fou

Other

58

Astronomical Photometry, Electrophotometry, Optical Filters, Planetary Nebulae, Radiant Flux Density, Abundance, Forbidden Bands, H Beta Line, Helium, Hydrogen, Interference Grating, Line Spectra, Stellar Magnitude

Scientific paper

Results are presented for photoelectric photometry of 25 planetary nebulae using 11 interference filters (eight for emission lines and three for the continuum). The instrument employed was a single-channel photometer with a cooled photomultiplier coupled to a 40-in. Cassegrain telescope operating at either f/7.6 or f/13.5. Absolute H-beta fluxes are determined for 22 nebulae, and fluxes relative to H-beta are derived for 23 nebulae in at least one of these lines: forbidden O III at 4959 A, forbidden Ar IV at 4740 A, He II at 4686 A, He I at 4471 A, forbidden Ne III at 3868 A, and forbidden O II at 3727 A. Apparent B and V magnitudes are obtained for most of the central stars. The ratios He(+)/H(+), He(2+)/H(+), and He/H are calculated for 10 nebulae; upper limits are set on these ratios for two others.

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