Abstract
We present a model atmosphere analysis of high resolution UV and optical spectra of the PN central star BD+33°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+33°2642. The measured mean radial velocity is combined with a HIPPARCOS proper motion measurement and the galactic orbit of BD+33° 2642 is calculated. The derived orbit provides strong evidence that BD+33°2642 is a member of the galactic halo population.
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Napiwotzki, R., Herrmann, M., Heber, U., Altmann, M. (2001). BD+33°2642: Abundance Patterns in the Central Star of a Halo PN. In: Szczerba, R., Górny, S.K. (eds) Post-AGB Objects as a Phase of Stellar Evolution. Astrophysics and Space Science Library, vol 265. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9688-6_42
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DOI: https://doi.org/10.1007/978-94-015-9688-6_42
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