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

Details UV spectroscopy of the hybrid PG 1159-type central stars of the planetary nebulae NGC 7094 and Abell 43 UV spectroscopy of the hybrid PG 1159-type central stars of the planetary nebulae NGC 7094 and Abell 43

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009coast.159..107z&link_type=abstract

"Communications in Asteroseismology, Vol. 159, p. 107-109. Proceedings of "JENAM 2008 Symposium No 4: Asteroseismology and Stell

Physics

1

Scientific paper

Hydrogen-deficient post-AGB stars have experienced a late helium-shell flash that mixes the hydrogen-rich envelope and the helium-rich intershell. The amount of hydrogen remaining in the stellar envelope depends on the particular moment when this late thermal pulse occurs.
Previous spectral analyses of hydrogen-deficient post-AGB stars revealed strong iron deficiencies of up to 1 dex. A possible explanation may be neutron captures due to an efficient s-process on the AGB that transformed iron into heavier elements. An enhanced nickel abundance would, thus, be an indication for this scenario.
We performed a detailed spectral analysis by means of NLTE model-atmosphere techniques based on high-resolution UV observations of the two PG 1159-type central stars of the planetary nebulae NGC 7094 and Abell 43 which are spectroscopic twins, i.e. they exhibit very similar spectra. We confirmed a strong iron-deficiency of at least one dex in both stars. The search for nickel lines in their UV spectra was entirely negative. We find that both stars are also nickel-deficient by at least one dex.

Affiliated with

Also associated with

No associations

Rating

UV spectroscopy of the hybrid PG 1159-type central stars of the planetary nebulae NGC 7094 and Abell 43 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with UV spectroscopy of the hybrid PG 1159-type central stars of the planetary nebulae NGC 7094 and Abell 43, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and UV spectroscopy of the hybrid PG 1159-type central stars of the planetary nebulae NGC 7094 and Abell 43 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-973430