Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094

Stellar post asymptotic giant branch (post-AGB) evolution can be completely altered by a final thermal pulse (FTP) which may occur when the star is still leaving the AGB (AFTP), at the departure from the AGB at still constant luminosity (late TP, LTP) or after the entry to the white-dwarf cooling se...

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Detalles Bibliográficos
Autores principales:	Löbling, L., Rauch, Thomas, Miller Bertolami, Marcelo Miguel, Todt, Helge, Friederich, Felix, Ziegler, M., Werner, Klaus, Kruk, Jeffrey W.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2019
Materias:	Ciencias Astronómicas Astronomía stars: abundances stars: AGB and post-AGB stars: atmospheres stars: evolution stars: individual: WD 1751 + 106 stars: individual: WD 2134 + 125
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/125467
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-125467
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas Astronomía stars: abundances stars: AGB and post-AGB stars: atmospheres stars: evolution stars: individual: WD 1751 + 106 stars: individual: WD 2134 + 125
spellingShingle	Ciencias Astronómicas Astronomía stars: abundances stars: AGB and post-AGB stars: atmospheres stars: evolution stars: individual: WD 1751 + 106 stars: individual: WD 2134 + 125 Löbling, L. Rauch, Thomas Miller Bertolami, Marcelo Miguel Todt, Helge Friederich, Felix Ziegler, M. Werner, Klaus Kruk, Jeffrey W. Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094
topic_facet	Ciencias Astronómicas Astronomía stars: abundances stars: AGB and post-AGB stars: atmospheres stars: evolution stars: individual: WD 1751 + 106 stars: individual: WD 2134 + 125
description	Stellar post asymptotic giant branch (post-AGB) evolution can be completely altered by a final thermal pulse (FTP) which may occur when the star is still leaving the AGB (AFTP), at the departure from the AGB at still constant luminosity (late TP, LTP) or after the entry to the white-dwarf cooling sequence (very late TP, VLTP). Then convection mixes the He-rich material with the H-rich envelope. According to stellar evolution models the result is a star with a surface composition of H≈20 per cent by mass (AFTP), ≈ 1 per cent (LTP), or (almost) no H (VLTP). Since FTP stars exhibit intershell material at their surface, spectral analyses establish constraints for AGB nucleosynthesis and stellar evolution. We performed a spectral analysis of the so-called hybrid PG 1159-type central stars (CS) of the planetary nebulae Abell 43 and NGC 7094 by means of non-local thermodynamical equilibrium models. We confirm the previously determined effective temperatures of T<sub>eff</sub>=115000±5000K and determine surface gravities of log(g/(cms<sup>−2</sup>))=5.6±0.1 for both. From a comparison with AFTP evolutionary tracks, we derive stellar masses of 0.57<sup>+0.07</sup><sub>−0.04</sub> M⊙ and determine the abundances of H, He, and metals up to Xe. Both CS are likely AFTP stars with a surface H mass fraction of 0.25 ± 0.03 and 0.15 ± 0.03, respectively, and an Fe deficiency indicating subsolar initial metallicities. The light metals show typical PG 1159-type abundances and the elemental composition is in good agreement with predictions from AFTP evolutionary models. However, the expansion ages do not agree with evolution time-scales expected from the AFTP scenario and alternatives should be explored.
format	Articulo Articulo
author	Löbling, L. Rauch, Thomas Miller Bertolami, Marcelo Miguel Todt, Helge Friederich, Felix Ziegler, M. Werner, Klaus Kruk, Jeffrey W.
author_facet	Löbling, L. Rauch, Thomas Miller Bertolami, Marcelo Miguel Todt, Helge Friederich, Felix Ziegler, M. Werner, Klaus Kruk, Jeffrey W.
author_sort	Löbling, L.
title	Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094
title_short	Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094
title_full	Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094
title_fullStr	Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094
title_full_unstemmed	Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094
title_sort	spectral analysis of the hybrid pg 1159-type central stars of the planetary nebulae abell 43 and ngc 7094
publishDate	2019
url	http://sedici.unlp.edu.ar/handle/10915/125467
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Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094

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