HRD of B and Be stars in NGC 330. Presumably single B and Be stars are marked by a circle and diamond, respectively, while detected SB1s are indicated by symbols with red frames. The projected rotational velocity of is given by the color of the symbol. To guide the eye, we overplot evolutionary tracks from Georgy et al. (2013) assuming Z = 0.002, an initial rotation rate of 50% critical, and for different initial masses as indicated in the plot. We further overplot 35 Myr (dashed) and 40 Myr (dotted) isochrones with the same assumptions. Stars above the TO in the CMD and peculiar stars are marked by their ID. The limited availability of diagnostic spectral lines, photometric data points, and suitable models can lead to actual errors larger than the formal fitting errors indicated here.