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Upper main sequence stars with
anomalous abundances
Verónica Pérez Meléndez1^ and Carlos Saffe*2
1) College of Science and Technology, Universidad Metropolitana, San Juan, PR. 00928
2) Instituto de Ciencias Astronómicas, de la Tierra y del Espacio (ICATE) , San Juan, Argentina, 5400
In this work we study a possible relation between abundances of ApSi stars with stellar parameters and rotation. We compare the abundance of 4 field peculiar stars ( HD138764, HD145788, HD159376 and HD210424) and eigth objects belonging to open clusters ( BD-4 1530, BD-6 1234, CD-35 11994, CD-51 3141, CD-52 1605, CD-59 1673, CD-59 1740 and TYC42-2169-1) and assume that the age of the stars is the same as the age of the clusters. We used echelle spectra taken with REOSC-CD spectograph attached to CASLEO 2.15m telescope. For the analysis we used the IRAF reduction package along with ATLAS9 model atmospheres and determine abundances using the program WIDTH. This work will allow us to test the theory of difussion as well as determine the importance of convection/rotation in these stars.
Key Words: echelle spectra