The location of B275 (red parallellogram) in the HRD next to PMS tracks from Hosokawa & Omukai (2009) with the ZAMS mass labeled and open symbols indicating lifetimes. The thin dashed and thin dot-dashed lines are the birth lines for accretion rates of 10^-4   M_⊙ yr^-1 and 10^-5   M_⊙ yr^-1, respectively; the thick solid line is the ZAMS (Schaller et al. 1992). The filled and open circles represent stars in M 17 for which a spectral type has been determined (Hoffmeister et al. 2008), within a radius of  and , respectively; dots are other stars in M 17. B275 is on its way to becoming a 6 − 8 M_⊙ ZAMS star.