Volume 413, Number 3, January III 2004
|Page(s)||1009 - 1017|
|Section||Stellar structure and evolution|
|Published online||07 January 2004|
Observatório Nacional, Rua José Cristino, 77, CEP 20921-400, São Cristóvão, Rio de Janeiro-RJ, Brazil
Corresponding author: email@example.com
Accepted: 8 August 2003
This work reports the low- and high-resolution spectroscopic diagnostic diagrams, radial velocity, stellar parameters and abundance analysis of the planetary nebula Hen 3-1312. The low- and high-resolution spectra reveal that Hen 3-1312 is in fact a very-low-excitation object, in a binary system with a supergiant as a cool central star. The analysis of the high-resolution spectrum shows the cool stellar component to have an effective temperature of K and a surface gravity of log corresponding to a spectral type of F(6-7)I. These parameters result in an estimated primary luminosity of , implying a distance of 4400 pc which is in agreement with previous determinations. The abundance analysis reveals Hen 3-1312 to be a metal-poor object having . The mean abundances of carbon, nitrogen and oxygen are found to be solar, however the α-elements (Mg, Si and Ca) are underabundant relative to the Sun. The abundance profile of Hen 3-1312 is analyzed and compared with other classes of stars with similar atmospheric parameters.
Key words: stars: abundances / stars: binaries: symbiotic / stars: AGB and post-AGB
© ESO, 2004
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.