EDP Sciences
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Volume 402, Number 1, April IV 2003
Page(s) 331 - 334
Section Formation and evolution of planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20030222

A&A 402, 331-334 (2003)
DOI: 10.1051/0004-6361:20030222

Elemental abundance studies of CP stars

The helium-weak stars HD 19400, HD 34797 and HD 35456*
M. S. Alonso1, Z. López-García2, 3, 1, S. Malaroda2, 1, 4 and F. Leone5, 6

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

(Received 23 August 2002 / Accepted 16 December 2002 )

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.

Key words: stars: chemically peculiar -- stars: abundances -- stars: individual: HD 19400 -- stars: individual: HD 34797 -- stars: individual: HD 35456

Offprint request: Z. López-García, zlgarcia@casleo.gov.ar

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