Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...280..241r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 280, no. 1, p. 241-254
Astronomy and Astrophysics
Astrophysics
21
Emission Spectra, H Alpha Line, H Beta Line, H Ii Regions, Imagery, Interstellar Extinction, Line Spectra, Planetary Nebulae, Astronomical Maps, Continuous Spectra, High Resolution, Light (Visible Radiation), Nitrogen, Oxygen
Scientific paper
We performed narrow band, optical line imaging of the planetary nebula NGC 7027 in sub-arcsecond seeing conditions. In all our filters, centered on the hydrogen alpha 6563, hydrogen beta 4861, (NII) 6583, (OIII) 5007 lines and in a 6670/80 hydrogen alpha continuum band, the nebula shows a complex clumpy structure whereas the central star is well resolved in the continuum band. Image analysis allows us to obtain a very accurate map of the local extinction down to AV = 5 and to estimate for the exciting source mV = 16.60 +/- 0.15, leading to Tstar approximately equal to 220,000 K and Lstar approximately equal to 4,700 solar luminosity. Correcting our images for the extinction, the true annular structure of the planetary nebula is for the first time revealed at optical wavelengths. We can definitely confirm that the optical maximum corresponds to a 'hole' in the dust distribution. We track the ionization status of the nebula, finding evidence for a complex scenario.
Clampin Marc
Ligori Sebastiano
Paresce Francesco
Robberto Massimo
Staude H. J.
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