Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..243g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 243-256.
Astronomy and Astrophysics
Astrophysics
3
Astronomical Photometry, Planetary Nebulae, Color, Continuous Radiation, Interstellar Extinction, Light Scattering, Magellanic Clouds, Orion Nebula
Scientific paper
Observed VBLUW colours of emission nebulae of the SMC, LMC, and the Orion nebula are reconstructed from published emission line ratios and theoretical H and 2-photon continua. The authors discuss colour corrections for internal reddening, scattered star light (in particular for the Orion nebula), and stellar backgrounds. The calculations reproduce the observed colours in the (B-U)/(B-L) diagram and indicate a correlation of (B-U) with the [O II] 3727/Hβ line ratios. After a more detailed empirical confirmation, this correlation may eventually be used as a diagnostic indicator of emission nebulae. The authors also give colours for a few galactic planetary nebulae, and a tentative interpretation of the measurements.
Greve Albert
van Genderen Arnout M.
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