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Fig. 1
Location of DD Vel and HQ Car in a K, J − K colour−magnitude diagram. The dashed line shows the zero-age-horizontal-branch (ZAHB), while the coloured lines display HB evolutionary models for stellar masses ranging from 0.49 to 0.58 M⊙. The black lines display the instability strip for RR Lyrae and BL Herculis stars.
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