SIMBAD references

1998A&A...329L...9P - Astronomy and Astrophysics, volume 329, L9-12 (1998/1-1)

Weak emission line [WELS] central stars of planetary nebulae are [WC]-PG 1159 stars.

PARTHASARATHY M., ACKER A. and STENHOLM B.

Abstract (from CDS):

The characteristics of the spectra of weak emission line stars (WELS) are found to be very similar to that of [WC]-PG1159 and PG1159 objects. On the basis of the spectra we find 31 WELS central stars of planetary nebulae to be in fact [WC]-PG1159 stars. These stars mark the transition from the [WC] central stars of planetary nebulae to the PG1159 (pre-)white dwarfs. The evolutionary sequence appears to be [WC late]-[WC early]-WELS=[WC]-PG1159-PG1159. The presence of nebulae and dust shells around these stars and also the significant percentage of [WC]-PG1159 stars among the [WC] central stars of PN indicates that late He-flash scenario may not be the principal mechanism for their post-AGB evolution towards the non-DA white dwarf stage. We found 4 hybrid central stars. They display a HeII/CIV 4650-4686Å trough very similar to that of PG1159 stars. However, their spectra show stellar Balmer lines indicating that they are relatively hydrogen-rich in contrast to the PG1159 stars.

Abstract Copyright:

Journal keyword(s): stars: post-AGB - stars: carbon - stars: evolution - ISM: planetary nebulae - stars: emission-line

Simbad objects: 51

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