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Weak emission line [WELS] central stars of planetary nebulae are [WC]-PG1159 stars

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dc.contributor.author Parthasarathy, M
dc.contributor.author Acker, A
dc.contributor.author Stenholm, B
dc.date.accessioned 2008-08-18T11:20:22Z
dc.date.available 2008-08-18T11:20:22Z
dc.date.issued 1998-01
dc.identifier.citation Astronomy and Astrophysics, Vol. 329, No. 1, pp. L9 - L12 en
dc.identifier.issn 0004-6361
dc.identifier.uri http://hdl.handle.net/2248/3191
dc.description.abstract 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 - 4686 Angstroms 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. Based on observations obtained at the European Southern Observatory (ESO), La Silla, Chile. en
dc.format.extent 169799 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher European Southern Observatory en
dc.relation.uri http://aa.springer.de/bibs/8329001/23000l9/small.htm en
dc.subject Stars: Post-AGB en
dc.subject Stars: Carbon en
dc.subject Stars: Evolution en
dc.subject ISM: Planetary Nebulae en
dc.subject Stars: Emission-Line en
dc.title Weak emission line [WELS] central stars of planetary nebulae are [WC]-PG1159 stars en
dc.type Article en

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