Spectroscopic investigation of old planetaries. II - Detection of a 'hybrid' central star

Details Spectroscopic investigation of old planetaries. II - Detection of a 'hybrid' central star Spectroscopic investigation of old planetaries. II - Detection of a 'hybrid' central star

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249l..16n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. L16-L18.

Astronomy and Astrophysics

Astrophysics

41

Planetary Nebulae, Stellar Atmospheres, Stellar Evolution, Stellar Spectra, Abundance, Balmer Series, Hot Stars, Line Spectra

Scientific paper

By means of a spectroscopic survey of old planetary nebulae it definitely confirms the planetary nebula status of S 68 (PK 030 + 06 1) and detects the 'hybrid' nature of its nucleus: the spectrogram shows strong C IV and He II lines similar to those of the PG 1159 stars, and strong Balmer lines, indicating a quite unusual composition. The nucleus of S 68 constitutes obviously a new class of hot central stars which is in conflict with present evolutionary scenarios.

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