BD+33̂ 2642: Abundance Patterns in the Central Star of a Halo PN

Details BD+33̂ 2642: Abundance Patterns in the Central Star of a Halo PN BD+33̂ 2642: Abundance Patterns in the Central Star of a Halo PN

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001assl..265..277n&link_type=abstract

Post-AGB Objects as a Phase of Stellar Evolution, Proceedings of the Toruń Workshop held July 5-7, 2000. Edited by R. Szczerba a

Astronomy and Astrophysics

Astrophysics

6

Scientific paper

We present a model atmosphere analysis of high resolution UV and optical spectra of the PN central star BD + 33̂ 2642. The derived abundance pattern is best explained by a dust-gas fractionation scenario. Since it it suspected that this process is related to binarity we checked the available spectroscopic material and found evidence for radial velocity variations, indicating a binary nature of BD+33̂ 2642. The measured mean radial velocity is combined with a HIPPARCOS proper motion measurement and the galactic orbit of BD + 33̂ 2642 is calculated. The derived orbit provides strong evidence that BD + 33̂ 2642 is a member of the galactic halo population.

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