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A search for s-process elements in extremely metal-poor halo planetary nebulae

Published online by Cambridge University Press:  09 March 2010

Masaaki Otsuka ,
Akito Tajitsu ,
Hideyuki Izumiura  and
Siek Hyung
Masaaki Otsuka
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, U.S.A. email: otsuka@stsci.edu
Akito Tajitsu
Affiliation:
Subaru Telescope, NAOJ, 650 North A'ohoku Place, Hilo, Hawaii 96720, U.S.A.
Hideyuki Izumiura
Affiliation:
Okayama Astrophysical Observatory (OAO), NAOJ, Kamogata, Okayama 719-0232, Japan
Siek Hyung
Affiliation:
School of Science Education (Astronomy), Chungbuk National University, 12 Gaeshin-dong Heungduk-gu, CheongJu, Chungbuk 361-763, Korea
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Abstract

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We have performed deep high-dispersion spectroscopy to examine enhancement of s-process elements in the exremely metal-poor ([Ar/H]~−2.1) halo planetary nebulae H4-1 and BoBn1 using the 8.2-m Subaru telescope/High-Dispersion Spectrograph (HDS). We have detected several emission lines of s-process elements in H4-1 and BoBn1, and we have found that the enhancement of heavy s-process elements in these objects is comparable with that in s-process enhanced CEMP stars with [Fe/H]>−2.5. The C- and N-rich abundances of H4-1 and BoBn1 might be explained by binary evolution models. We have detected 5 fluorine lines in BoBn1. The re-estimated F abundance using these lines is [F/H]=+1.4±0.1.

Keywords

(ISM:) planetary nebulae: individual (H4-1, BoBn1)stars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 77 - 78
Copyright
Copyright © International Astronomical Union 2010

References

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