Analysis of BD+33 deg 2642: A newly detected planetary nebula in the galactic halo and its central star

Details Analysis of BD+33 deg 2642: A newly detected planetary nebula in the galactic halo and its central star Analysis of BD+33 deg 2642: A newly detected planetary nebula in the galactic halo and its central star

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..239n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 239-248

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B Stars, Computational Astrophysics, Cosmic Dust, Galactic Halos, Interstellar Gas, Planetary Nebulae, Spectrum Analysis, Stellar Atmospheres, Stellar Mass, Stellar Temperature, Abundance, Chemical Composition, Emission Spectra, Line Spectra, Metals, Photoionization, Stellar Evolution

Scientific paper

The spectra of the star BD+33 deg 2642 and its surrounding planetary nebula (PN) are analyzed. The stellar parameters are found to be Teff = 20,200 K, log g = 2.9; the stellar mass is 0.560 solar mass. In the stellar atmosphere, He is solar, C, N, O, Mg, Si are depleted by about 1 dex, and Fe is depleted by 2 dex relative to the sun. This abundance pattern is similar to that found in atmospheres of B-type post-AGB stars in the galactic halo and some peculiar A- and F-type post-AGB stars. The chemical mixture of these stars is commonly explained by dredge-up processes during the previous stellar evolution. It is shown that separation of gas and dust, proposed for the interpretation of chemical peculiarities in some cooler post-AGB stars, can explain the observed atmospheric mixture as well. The nebular emission is well interpreted by photoionization from the star, with the parameters given by the stellar atmospheric analysis. The metal abundances in the nebula are found to be as strongly depleted as they are in the star. Thus BD+33 deg 2642 is one of the few known population II PNe.

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