EDP Sciences
Free access
Volume 402, Number 2, May I 2003
Page(s) 693 - 700
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030202

A&A 402, 693-700 (2003)
DOI: 10.1051/0004-6361:20030202

Spectroscopic observations of two proto planetary-nebulae candidates: SS73 56 & Hen 2-79

C. B. Pereira, S. J. C. Landaberry and F. X. de Araújo

Observatório Nacional-MCT, Rua José Cristino 77, CEP 20921-400, São Cristóvão, Rio de Janeiro-RJ, Brazil
(Received 31 October 2002 / Accepted 14 February 2003 )

We report new spectroscopic observations of two proto planetary-nebulae candidates: SS73 56 and Hen 2-79 between 3200 Å and 8000 Å. From the measurements of several forbidden and permitted emission lines of single ionized iron, we derived the color excess and the excitation temperature. We discuss the nature of the two objects based on data obtained. The iron spectrum closely resembles $\eta$ Car but the absence or the weakness of [N II]5754 Å compared to $\eta$ Car reduces the possibility of being a LBV object. We also compare the two objects with the peculiar emission-line object SS73 11 that was recently analyzed by us.

Key words: stars: emission-line, Be -- stars: AGB and post-AGB -- stars: individual: SS73 56, Hen 2-79

Offprint request: C. B. Pereira, claudio@on.br

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