SIMBAD references

1994A&A...284L...5W - Astronomy and Astrophysics, volume 284, L5-8 (1994/4-1)

On the neon abundance in PG 1159-type central stars on planetary nebulae.


Abstract (from CDS):

We announce the first detection and identification of a neon line in the spectra of hot central stars of planetary nebulae. It concerns the 3644A absorption line of highly ionised neon (Ne VII) in the extremely hot (Teff > 100000 K) PG1159-type (i.e. hydrogen deficient) objects RX J2117+3412, NGC246, and K 1-16. We present medium resolution spectra and a non-LTE analysis aiming at the abundance determination of neon in these exotic stars. The analysis reveals that the neon mass fraction (about 2%) strongly exceeds the solar value. This is in accordance with our understanding of the evolutionary status of the PG 1159 stars: they exhibit deep intershell matter, which was processed by triple alpha burning and layed bare after strong mass-loss events.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: evolution - AGB and post-AGB - white dwarfs - planetary nebulae: general

CDS comments: (abstracts). RX J2117+3412 = RX J2117.1+3412

Simbad objects: 3

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