Elemental abundance studies of CP stars

III. The magnetic CP stars α Scl and HD 170973

¹ Complejo Astronómico El Leoncito, C.C 467, 5400 San Juan, Argentina
² Member of the Carrera del Investigador Científico, CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas de la República, Argentina
³ Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Argentina
⁴ Department of Physics, The Citadel, 171 Moultrie Street, Charleston, SC 29409, USA
⁵ 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, Argentina
⁶ Departamento de Fisica, Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, Av. Independencia 1800, 4000 San Miguel de Tucumán, Argentina

Z. López-Garcia

Received: 17 October 2000
Accepted: 4 December 2000

Abstract

Fine analyses of the magnetic CP stars α Scl and HD 170973 are presented using ATLAS9 model atmospheres which have same bulk metallicity as the deduced abundances. The light elements are mostly solar except for silicon, and all the heavier elements except nickel in HD 170973, which is solar, are greatly overabundant. The iron peak elements are typically 10 times overabundant, Sr is of order of 1000 times solar, Y and Zr are of order of 100 times solar. The rare earths are 1000 or more times overabundant.