SCYON Abstract

Received on November 13 2006

CCD photometric search for peculiar stars in open clusters. VIII. King 21, NGC 3293, NGC 5999, NGC 6802, NGC 6830, Ruprecht 44, Ruprecht 115, and Ruprecht 120

AuthorsM. Netopil (1), E. Paunzen (1), H.M. Maitzen (1), O.I. Pintado (2), A. Claret (3), L.F. Miranda (3), I.Kh. Iliev (4), V. Casanova (3)
Affiliation
(1) Institute of Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
(2) Departamento de Fisica, Facultad de Ciencias Exactas y Tecnologia, Universidad Nacional de Tucuman, Argentina - Consejo Nacional de Investigaciones Cientificas y Tecnicas de la Republica Argentina
(3) Instituto de Astrofisica de Andalucia CSIC, Apartado 3004, 18080 Granada, Spain
(4) Institute of Astronomy, National Astronomical Observatory, P.O. Box 136, BG-4700 Smolyan, Bulgaria
Accepted byAstronomy & Astrophysics
Contactmartin.netopil@univie.ac.at
URLhttp://www.arxiv.org/abs/astro-ph/0611173
Links King 21 / NGC 3293 / NGC 5999 / NGC 6802 / NGC 6830 / Ruprecht 44 / Ruprecht 115 / Ruprecht 120

Abstract

We continue our survey of magnetic chemically peculiar (CP2) stars in galactic open clusters to shed more light on their origin and evolution. To study the group of CP2 stars, it is essential to find these objects in different galactic environments and at a wide range of evolutionary stages. The knowledge of open cluster ages and metallicities can help for finding a correlation between these parameters and the (non-)presence of peculiarities, which has to be taken into account in stellar evolution models. The intermediate band Delta a photometric system samples the depth of the 5200A flux depression by comparing the flux at the centre with the adjacent regions with bandwidths of 110A, to 230A. It is capable of detecting magnetic CP2 and CP4 stars with high efficiency, but also the groups of (metal-weak) lambda Bootis and classical Be/shell stars can be successfully investigated. In addition, it allows the age, reddening, and distance modulus to be determined with appropriate accuracy by fitting isochrones. From the 1677 observed members of the eight open clusters, one Ae and twenty-five CP2 stars were identified. Furthermore nineteen deviating stars are designated as questionable for several reasons. The estimated age, reddening, and distance for the programme clusters were compared with published vales of the literature and discussed in this context. The current paper shows that CP2 stars are continuously present in very young (7Myr) to intermediate age (500Myr) open clusters at distances greater than 2kpc from the Sun.