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Issue A&A
Volume 370, Number 2, May I 2001
Page(s) 456 - 467
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010220



A&A 370, 456-467 (2001)
DOI: 10.1051/0004-6361:20010220

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

G. H. Tovmassian1, G. Stasinska2, V. H. Chavushyan3, S. V. Zharikov1, C. Gutierrez4 and F. Prada1

1  OAN, Instituto de Astronomía, UNAM, México
2  DAEC, Observatoire de Meudon, 92195 Meudon Cedex, France
    e-mail: grazyna.stasinska@obspm.fr
3  Instituto Nacional de Astrofísica Optica y Electrónica, AP 51 y 216, Puebla, Pue., México
    e-mail: vahram@inaoep.mx
4  Instituto de Astrofísica de Canarias, Ave. Via Láctea s/n, 38200 La Laguna, Tenerife, Spain
    e-mail: cgc@ll.iac.es

(Received 6 November 2000 / Accepted 7 February 2001)

Abstract
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.


Key words: ISM: planetary nebulae: general -- ISM: planetary nebulae: individual: SBS 1150+599A (PN G135.9+55.9), -- galaxies: halos -- stars: binaries: symbiotic -- stars: cataclysmic variables

Offprint request: G. Tovmassian, gag@astrosen.unam.mx

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