EDP Sciences
Free Access
Volume 431, Number 3, March I 2005
Page(s) 1007 - 1017
Section Stellar structure and evolution
DOI https://doi.org/10.1051/0004-6361:20041506
Published online 16 February 2005

A&A 431, 1007-1017 (2005)
DOI: 10.1051/0004-6361:20041506

High resolution spectroscopy of the hot post-AGB stars IRAS 13266-5551 (CPD-55 5588) and IRAS 17311-4924 (Hen3-1428)

G. Sarkar1, M. Parthasarathy2 and B. E. Reddy2

1  Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India
    e-mail: gsarkar@iitk.ac.in
2  Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India

(Received 22 June 2004 / Accepted 23 September 2004 )

High resolution spectra covering the wavelength range 4900 Å to 8250 Å of the hot post-AGB stars IRAS 13266-5551 (CPD-55 5588) and IRAS 17311-4924 (Hen3-1428) reveal absorption lines of C II, N II, O II, Al III, Si III and Fe III and a rich emission line spectrum consisting of H I, He I, C II, N I, O I, Mg II, Al II, Si II, V I, Mn I, Fe III, [Fe II] and [Cr II]. The presence of [N II] and [O I] lines and absence of [O III] indicate low excitation nebulae around these stars. The components of Na I absorption lines indicate the presence of neutral circumstellar envelopes in addition to the low excitation nebulae around these two hot post-AGB stars. The H $_\alpha$ lines show P-Cygni profiles indicating ongoing post-AGB mass loss. From the absorption lines we derived heliocentric radial velocities of 65.31  $\pm$ 0.34 km s -1 and 27.55  $\pm$ 0.74 km s -1 for IRAS 13266-5551 and IRAS 17311-4924 respectively. The high Galactic latitude and large radial velocity of IRAS 13266-5551 indicate that it belongs to the old disk population. Preliminary estimates for the CNO abundances in IRAS 13266-5551 are obtained.

Key words: stars: AGB and post-AGB -- stars: early-type -- stars: abundances -- stars: evolution

SIMBAD Objects

© ESO 2005

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.