Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..114a&link_type=abstract
Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 1, p. 114-120. Research supported by the University of Chicago.
Astronomy and Astrophysics
Astrophysics
28
Astronomical Photometry, Binary Stars, Planetary Nebulae, Stellar Mass Ejection, Astronomical Models, Balmer Series, Electron Density (Concentration), Emission Spectra, Line Spectra
Scientific paper
New photometric observations of the lines and continuum in the compact nebulae VV 8 and M3-27 are presented. The data for VV 8 are very similar to those obtained by O'Dell nearly 10 years ago. Both nebulae have high electron densities and are self-absorbed in H-alpha. Parameters describing the physical conditions are estimated using the observed Balmer and forbidden O III line strengths. By comparing the observations with suitable models for young planetary nebulae, the abundances of helium, oxygen, and neon are shown to be normal. The forbidden N II lines are stronger than predicted. The continuum in M3-27 is shown to be in good agreement with theory, while the continuum in VV 8 in the visible and infrared is much brighter than predicted. The similarity between the line spectra and inferred properties of the nebulae suggests that the optical continuum in VV 8 is unrelated to the nebulae, and may come from a late-type companion in a binary.
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