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Projeto Observacional para 2018A - OP2018A-005

Autor: Carlos Guerrero
Instituição: unam

Marcelo Borges Fernandes
Tiago Batista Souza

Título: Peckle interferometry of stars in open clusters

Resumo: It has been proposed that the color dispersion among stars in the CMD of open clusters (OC) along the MS is due to an abundant population of unresolved binaries. This observational bias affects the determination of the stellar parameters in two ways: the luminosity of the primary star is enhanced and the color index of the system becomes redder. These combined effects underestimate the distance and overestimate the age of the clusters. However, studies investigating the stellar multiplicity fraction in OC are very scarce. Using speckle interferometry, we have initiated a survey of binary stars in Galactic OC. With this proposal we want to continue an observing program started during semester 2017B, using the 1.6 m telescope and the Ixon Ultra EMCCD of the LNA. At this point, we have carried out two observing runs, but poor weather conditions have prevented us from collecting more data. However, we have achieved interesting resuts.