A new absolute magnitude calibration for red clump stars

•We present a new MVMV absolute magnitude calibration for the red clump stars.•We used the red clump stars in open and globular clusters.•Precise absolute magnitudes can be estimated from the calibration formula.

We present an MVMV absolute magnitude calibration including the B-VB-V colour and [Fe/H][Fe/H] metallicity for the red clump stars in the globular and open clusters with a wide range of metallicities: MV=0.627(±0.104)(B-V)0+0.046(±0.043)[Fe/H]+0.262(±0.111)MV=0.627(±0.104)(B-V)0+0.046(±0.043)[Fe/H]+0.262(±0.111). The calibration equation is valid in the ranges 0.42<(B-V)0<1.200.42<(B-V)0<1.20 mag, -1.55<[Fe/H]<+0.40-1.55<[Fe/H]<+0.40 dex and 0.43