EDP Sciences
Free access
Volume 435, Number 3, June I 2005
Page(s) 1087 - 1097
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20041994

A&A 435, 1087-1097 (2005)
DOI: 10.1051/0004-6361:20041994

Nebular abundances of southern symbiotic stars

G. J. M. Luna and R. D. D. Costa

Instituto de Astronomia, Geofisica e Ciências Atmosféricas (IAG), Universidade de São Paulo, São Paulo, Brazil
    e-mail: [gjmluna;roberto]@astro.iag.usp.br

(Received 10 September 2004 / Accepted 8 February 2005)

We have calculated relative element abundances for a sample of 43 symbiotic stars. Helium abundances and the relative elemental abundances N/O, Ne/O, Ar/O were derived from new spectra collected in the optical range through low dispersion spectroscopy. The He ionic abundances were derived taking into account self-absorption effects in Balmer lines. We found that the symbiotic stars in the galactic bulge have heavy element abundances showing the same wide distribution as other bulge objects. In the galactic disk, the symbiotic stars follow the abundance gradient as derived from different kinds of objects.

Key words: stars: binaries: symbiotic -- stars: abundances -- Galaxy: abundances

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