Photometric observations of stars in stellar trapezia

Le résumé fourni par la source

Abstract Photometric CCD observations of the brightest stars in several stellar trapezia (ADS 719, ADS 1869, ADS 13292, and ADS 13374) are presented. In order to measure the U, B, V, R, and I magnitudes of the stars in trapezia we utilise the aperture photometry technique. This study is performed on images obtained at the Observatorio Astronómico Nacional at San Pedro Mártir (OAN), Baja California, México. Comparison of our photometry with published results for IC 1590 (ADS 719) and Gaia (for all trapezia) is presented. With the $Q=(U-B)-0.72(B-V)$ parameter we obtained the spectral type of the stars as well as their distance to the Sun and their reddening. This work aims to analyse the accuracy of the spectral types derived from the Q parameter for the stars belonging to these trapezia. It is important to emphasise that this is the first step of an extended project to study stellar trapezia, their stellar content, the stars spectral types, and the dynamics of these stars which are subjected to strong dynamical interactions.

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