Abstract

A colour magnitude diagram to V = 20 is given for 395 stars in the heavily reddened open cluster NGC 6649. The absorption-corrected distance modulus is 11.00±0.15 mag (1585±110 pc) assuming R(OB) = 3.27±0.10 for NGC 6649 and based on a ZAMS with zero point referenced to a Pleiades distance modulus of 5.56 mag. The range of reddening over the 5 arcmin diameter of the cluster is |$\Delta E(B-V)=0.3$|mag. NGC 6649 contains the double mode Cepheid V367 Sct, which has |$\langle{M}_{v}\rangle=-3.80\pm0.06$| and |$\langle{B}_{0}\rangle-\langle{V}_{0}\rangle=0.58\pm0.02$|⁠.

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