New theoretical PL and PW relations for BL Her stars in the Rubin-LSST filters show weak metallicity dependence for filters redder than g, recommending W(i,g-i), W(z,i-z) and W(y,g-y) as standard candle relations.
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A theoretical framework for BL Her stars IV. New period-luminosity relations in the Rubin-LSST filters
New theoretical PL and PW relations for BL Her stars in the Rubin-LSST filters show weak metallicity dependence for filters redder than g, recommending W(i,g-i), W(z,i-z) and W(y,g-y) as standard candle relations.