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