Detailed atmospheric abundance analysis of the optical counterpart of the IR source IRAS 16559–2957
R. E. Molina1 and A. Arellano Ferro2
1 Laboratorio de Investigación en Física Aplicada y Computacional, Universidad Nacional Experimental del Tachira, Venezuela, (rmolina@unet.edu.ve).
2 Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70–264, 04510, México, D.F., México. (armando@astro.unam.mx).
Received 2012 June 8. ]]> Accepted 2013 January 16.
RESUMEN
Hemos emprendido un análisis detallado de las abundancias químicas de la contraparte óptica de la fuente infrarroja IRAS 16559–2957 con el fin de confirmar su posible naturaleza de estrella post–AGB. El análisis de un gran número de elementos, incluidos CNO y 12C/13C, muestra que este objeto ha experimentado el primer dragado y parece estar aún en fase de RGB.
ABSTRACT
We have undertaken a detailed abundance analysis oí the optical counterpart of the IR source IRAS16559–2957 with the aim of confirming its possible post–AGB nature. The star shows solar metallicity and our investigation of a large number of elements including CNO and 12C/13C suggests that this object has experienced the first dredge–up and it is likely still at RGB stage.
Key Words: stars: abundances — stars: AGB and post–AGB — stars: evolution.
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]]>ACKNOWLEDGMENTS
We are indebted to Prof. D. L. Lambert for permitting the use of the high resolution spectrum of IRAS 16559–2957 used in this work and to Prof. Sunetra Giridhar for her comments and suggestions on the abundance analysis. The pertinent comments and input of an anonymous referee are fully acknowledged. This work was supported by DGAPA–Universidad Nacional Autónoma de México project IN104612.
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