Binary nuclei of planetary nebulae.

Details Binary nuclei of planetary nebulae. Binary nuclei of planetary nebulae.

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988msngr..54...42a&link_type=abstract

The Messenger, vol. 54, p. 42-43

Physics

Central Stars:Light Curves, Central Stars:Planetary Nebulae, Light Curves:Central Stars, Photometry:Planetary Nebulae, Planetary Nebulae:Central Stars, Planetary Nebulae:Nuclei, Planetary Nebulae:Photometry, Planetary Nebulae:Spectroscopy, Spectroscopy:Planetary Nebulae

Scientific paper

About ten planetary nebulae have late-type central stars, which are too cool to ionize the nebula. This implies either the presence of a warmer companion (the true central star), or an unstable central star which was hotter in the past. These two phenomena - binarity and intrinsic variability -, which are physically very different, may give rise to apparently very similar variations: same behavior for the radial velocity curve and/ or for the light curve. In addition, in both cases, spectral peculiarities can be observed, such as stellar emission lines, which can be explained by chromospheric activity of the star or by mass exchange in a close binary system.

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