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Issue A&A
Volume 462, Number 1, January IV 2007
Page(s) 231 - 236
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20054529



A&A 462, 231-236 (2007)
DOI: 10.1051/0004-6361:20054529

Spectroscopic survey of post-AGB star candidates

C. B. Pereira1 and L. F. Miranda2

1  Observatório Nacional-MCT, Rua José Cristino 77, CEP 20921-400 São Cristóvão, Rio de Janeiro-RJ, Brazil
    e-mail: claudio@on.br
2  Instituto de Astrofísica de Andalucía, CSIC, Apdo. 3004, 18080 Granada, Spain
    e-mail: lfm@iaa.es

(Received 16 November 2005 / Accepted 19 September 2006)

Abstract
Aims.Our goal is to establish the true nature of post-AGB star candidates and to identify new post-AGB stars.
Methods.We used low resolution optical spectroscopy and we compared the spectra of the candidate post-AGB stars with those of stars in the library specta available in the literature and with spectra of "standard" post-AGB stars, and direct imaging in narrow-band filters.
Results.Spectra were obtained for 16 objects: 14 objects have not been observed previously and 2 objects are already known post-AGB stars used as "standards" for identification. From the spectra we identify: six new post-AGB stars with spectral types between G5 and F5, two H II regions the morphology of which is revealed in the direct images for the first time, a G giant with infrared emission, a young stellar object, a probable post-AGB star with emission lines and three objects for which the classification is still unclear. As a whole, our results provide new, reliable identifications for 10 objects among listed post-AGB star candidates.


Key words: stars: AGB and post-AGB -- H II regions -- stars: pre-main sequence



© ESO 2007


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