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We study a class of DFSZ-like models for the QCD axion that can addressobserved anomalies in stellar cooling. Stringent constraints from SN1987A andneutron stars are avoided by suppressed couplings to nucleons, while axioncouplings to electrons and photons are sizable. All axion couplings depend onfew parameters that also control the extended Higgs sector, in particularlepton flavor-violating couplings of the Standard Model-like Higgs boson $h$.This allows us to correlate axion and Higgs phenomenology, and we find thatthat ${\rm BR}(h \to \tau e)$ can be as large as the current experimental boundof 0.22%, while ${\rm BR} (h \to \mu \mu)$ can be larger than in the StandardModel by up to 70%. Large parts of the parameter space will be tested by thenext generation of axion helioscopes such as the IAXO experiment.

Flavor-Violating Higgs Decays and Stellar Cooling Anomalies in Axion Models