SBS 1150+599A: an extremely oxygen-poor planetary nebula in the Galactic halo?

Details SBS 1150+599A: an extremely oxygen-poor planetary nebula in the Galactic halo? SBS 1150+599A: an extremely oxygen-poor planetary nebula in the Galactic halo?

2001-04-12

arxiv.org/abs/astro-ph/0104222v1

Astronomy and Astrophysics

Astrophysics

13 pages, 5 figures, accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20010220

We report results of a spectrophotometric study of SBS 1150+599A and discuss the nature of this object based upon our data. Our study shows that SBS 1150+599A is most probably a planetary nebula located in the Galactic halo and not a cataclysmic variable as originally proposed by the authors of the Second Byurakan Survey from low resolution spectroscopy. We have further elaborated on the properties of SBS 1150+599A (now becoming PN G135.9+55.9) with tools used for planetary nebula analysis. Our photoionization models show that, in order to match the observational constraints, the oxygen abundance in the nebula is probably extremely low, around 1/500 solar, which is one order of magnitude lower than the most oxygen-poor planetary nebulae known so far. This finding has strong implications on our understanding of the formation of planetary nebulae and of the evolution of the Galactic halo.

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