A. Collado,1 and Z. López–García1,2
1 Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Av. Ignacio de la Roza 590 (O), Rivadavia, San Juan, Argentina, CPA: J5402DCS. (zlgarcia@casleo.gov.ar).
2 Complejo Astronómico El Leoncito, CASLEO, CONICET and Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Argentina. (zlgarcia@casleo.gov.ar).
Received 2008 August 08
Accepted 2009 February 16
]]> RESUMEN
Se ha llevado a cabo un análisis detallado de las abundancias en la estrella CP magnética HD 168733 utilizando espectros de alta resolución obtenidos con el espectrógrafo echelle EBASIM del telescopio de 2.1 m de CASLEO en Argentina. Los espectros cubren la región 382–700 nm. La estrella no puede ser clasificada ni como una peculiar de HgMn ni como perteneciente al grupo CP2 de silicio. Comparada con el Sol, C, N son levementes sobreabundantes mientras que el Mg y S son deficientes, Si es normal y P y Cl son sobreabundantes. Los elementos del pico de hierro: Sc, Ti, Cr y Fe son sobreabundantes. Se han identificado también líneas de Ti III y Fe III. HD 168733 muestra una gran sobreabundancia de Ga, Sr, Y, Zr, Xe, Pt, Hg y algunas tierras raras.
ABSTRACT
A detailed abundance analysis has been carried out for the magnetic CP star HD 168733 using high–resolution spectra obtained with the EBASIM echelle spectrograph at the 2.1 m CASLEO telescope in Argentina. The spectral coverage is 382–700 nm. It is neither a silicon nor a mercury–manganese star. Compared to the Sun, C and N are slightly overabundant, while Mg and S are deficient, Si is normal and P and Cl are overabundant. The iron peak elements Sc, Ti, Cr and Fe are overabundant. Lines of Ti III and Fe III are also identified. HD 168733 shows a great overabundance of Ga, Sr, Y, Zr, Xe, Pt, Hg and of some rare earths.
Key Words: stars: abundances — stars: chemically peculiar — stars: individual (HD 168733).
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