Volume 467, Number 3, June I 2007
|Page(s)||1249 - 1252|
|Section||Stellar structure and evolution|
|Published online||26 March 2007|
Identification of PN G232.0+05.7 as a new halo planetary nebula and of IRAS 19336-0400 as a new type III planetary nebula*
Observatório Nacional-MCT, Rua José Cristino, 77. CEP 20921-400 São Cristóvão. Rio de Janeiro-RJ, Brazil e-mail: firstname.lastname@example.org
2 Instituto de Astrofísica de Andalucía, CSIC, Apdo. 3004, 18080 Granada, Spain e-mail: email@example.com
Accepted: 15 March 2007
Aims.We determined the nature and Peimbert type of two low-excitation planetary nebulae, PNG 232.0+05.7 and IRAS 19336-0400.
Methods.We used low resolution optical spectroscopy in the range 3200–9000 Å.
Results.We derived line intensities, reddening, physical conditions (electron density and temperature) and ionic and elemental abundances. Based on the abundance analysis and its radial velocity we conclude that PNG 232.0+05.7 is a halo planetary nebulae. This discovery thus adds this object to the sample of ten known halo planetary nebulae. IRAS 19336-0400 is probably a type III planetary nebulae, as strongly suggested by its abundances and high radial velocity, although this conclusion awaits a better estimation of its distance.
Key words: planetary nebulae: individual: PN G232.0+05.7 / planetary nebulae: individual: IRAS 19336+0400
© ESO, 2007
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