Open Cluster NGC6613 in SerOB1 A Association

Abstract

We present the original technique to solve the problems of stellar astronomy using the highresolution spectroscopy and we describe the result of implementation of this technique to determine if the stellar clusterNGC6613 belongs to the SerOB1A association. From the only one estimation available, the distance toNGC6613 equals 1.3 kpc. It is not clear if the cluster linkedwith the SerOB1A association, the distance to which is 2.1 kpc. For nine stars in the region of NGC6613, the radial velocities were measured from the spectra obtained with the NES spectrometer of the 6-m SAORAS telescope, as well as conducted the two-dimensional spectral classification and found their distances with themethod of spectral parallaxes. Seven of nine stars are referred to the cluster members; the average distance to them is 2.2 ± 0.1 kpc. The distance estimates were controlled using the Na I (1) interstellar line profiles. Thus, it was understood that the cluster NGC6613 is a member of the SerOB1A association and its influence should be taken into account, when describing the star formation in the association.