Outer haloes of planetary nebulae as probes of a fast luminosity decline in their nuclei

Details Outer haloes of planetary nebulae as probes of a fast luminosity decline in their nuclei Outer haloes of planetary nebulae as probes of a fast luminosity decline in their nuclei

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156..217t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 217-222.

Astronomy and Astrophysics

Astrophysics

31

Astronomical Models, Halos, Planetary Nebulae, Stellar Evolution, Astronomical Catalogs, Emission Spectra, Hertzsprung-Russell Diagram, Luminous Intensity, Stellar Envelopes

Scientific paper

Theoretical models of a planetary nebula nuclei burning hydrogen quiescently predict a fast luminosity decline when the star leaves the horizontal part of its evolutinary track and descends towards the white dwarf sequence. Time-dependent photoionization models of nebulae show that this event should be followed by the appearance of a double-envelope structure in the surrounding nebula: an inner, brighter, high-excitation (optically thick to the ionizing radiation) portion of the nebula is surrounded by a faint, low excitation recombining halo fading with time. An observational search for recombining haloes in planetary nebulae would, therefore, allow to confirm whether the central stars really experience a rapid luminosity drop during their evolution. This would, in turn, help to answer the question if the planetary nebula formation process takes place during quiescent H-burning, or whether it is triggered by a helium shell flash. Table 1 lists planetary nebulae which are suspected of possesing recombining haloes. Detailed spectroscopic observations of the outer envelopes are, however, necessary to verify their true nature.

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