Elemental abundance studies of CP stars

The helium-weak stars HD 19400, HD 34797 and HD 35456*

¹ Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Argentina
² Complejo Astronómico El Leoncito, CC 467, 5400 San Juan, Argentina
³ Member of the Carrera del Investigador Científico, CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina
⁴ Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Argentina
⁵ Osservatorio Astrofisico di Catania, Citá Universitaria, 95125 Catania , Italy
⁶ Visiting Astronomer at Complejo Astronómico El Leoncito operated under agreement between Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan

Corresponding author: Z. López-García, zlgarcia@casleo.gov.ar

Received: 23 August 2002
Accepted: 16 December 2002

Abstract

An analysis of the abundances of the helium-weak CP stars HD 19400, HD 34797 and HD 35456, is presented using ATLAS9 model atmospheres and observational material taken with a REOSC echelle spectrograph attached to the Jorge Sahade 2.15 m telescope at CASLEO. The light elements are deficient except silicon which is overabundant in HD 19400 and HD 34797. The iron peak elements are all overabundant by factors between 5 and 60. The heavy elements show an overabundance in the three stars studied.