Volume 462, Number 1, January IV 2007
|Page(s)||231 - 236|
|Section||Stellar structure and evolution|
|Published online||02 November 2006|
Spectroscopic survey of post-AGB star candidates *,**
Observatório Nacional-MCT, Rua José Cristino 77, CEP 20921-400 São Cristóvão, Rio de Janeiro-RJ, Brazil e-mail: email@example.com
2 Instituto de Astrofísica de Andalucía, CSIC, Apdo. 3004, 18080 Granada, Spain e-mail: firstname.lastname@example.org
Accepted: 19 September 2006
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
Based on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC), and at the Observatorio de Sierra Nevada, which is operated by the Consejo Superior de Investigaciones Científicas through the Instituto de Astrofísica de Andalucía (Granada, Spain).
© ESO, 2007
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