Stellar content of young open clusters. I - Blue stragglers. II - Be stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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B Stars, Blue Stars, Cluster Analysis, Hertzsprung-Russell Diagram, Open Clusters, Stellar Color, Abundance, Color-Magnitude Diagram, Main Sequence Stars, Mass Transfer, Radial Velocity, Star Distribution, Stellar Evolution, Stellar Magnitude, Stellar Spectra, Stellar Spectrophotometry, Ubv Spectra

Scientific paper

The properties of the blue stragglers and Be stars found in open clusters younger than the Hyades are examined. Thirty-nine blue stragglers were detected at the left of the upper main sequence in the color-magnitude diagrams of 75 open clusters, with the frequency of detection noted to increase with cluster age. About half of the stragglers show peculiar abundance characteristics corresponding to spectral classes Am, Ap, Bp, Be and Of. The spectroscopic and photometric behavior of the blue stragglers is, however, identical with that of main sequence stars of the same type and peculiarity. It is suggested that the blue stragglers with peculiar spectroscopic characteristics may result from the evolution, perhaps quasi-homogeneous, of abnormal stars. Analysis of the absolute magnitudes and dereddened colors calculated for 94 Be stars in 34 open clusters indicates the distribution to peak at spectral types B1-B2 and B7-B8, and in clusters with turn-up types at B1-B2. Cluster Be stars occupy the whole main sequence band, and evolutionary states from nearly unevolved to fully evolved. They may be classified according to their position on the color-magnitude diagram, with the distinctions between classes also related to spectroscopic differences.

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