The brightest stars of a young open cluster will be:

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The brightest stars of a young open cluster will be massive blue main sequence stars, as they are more luminous than other stars due to their high mass and high temperature. Cepheid variables and T Tauri variables are not necessarily the brightest stars in a young open cluster, and red giants and yellow main sequence stars are not typically found in young open clusters. Young open clusters are typically dominated by massive blue main sequence stars as these are the first to form and evolve quickly. Cepheid variables and red giants are more commonly found in older clusters, while yellow main sequence stars and T Tauri variables can be present but are not the brightest stars.

The Brightest Stars of a Young Open Cluster Will Be