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tokens: L.M. and M.J. contributed equally to this manuscript. Fruitful discussions with Maria Lugaro, Carolyn Doherty, and Emese Plachy are gratefully acknowledged. L.M. was supported by the Premium Postdoctoral Research Program of the Hungarian Academy of Sciences. The research leading to these results has received funding from the LP2014-17 and LP2018-7 Lendület grants of the Hungarian Academy of Sciences and from the NKFIH K-115709 grant of the National Research, Development and Innovation Office of Hungary. We acknowledge with thanks the variable star observations from the AAVSO International Database contributed by observers worldwide and used in this research. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France, and NASA’s Astrophysics Data System Bibliographic Services. M.J. was supported by Martin Asplund, the Research School of Astronomy and Astrophysics at Australian National University, and funding from Australian Research Council grant No. DP150100250. M.J. wishes to acknowledge John Bourke for his assistance in revising this manuscript and Maria Lugaro for financial support of her scientific residences at Konkoly Observatory. Facility: AAVSO. Software: MESA (Paxton et al. 2018 ), GYRE (Townsend Teitler 2013 ), astropy (Astropy Collaboration et al. 2013 ; Price-Whelan et al. 2018 ), matplotlib (Hunter 2007 ), numpy (van der Walt et al. 2011 ), scipy (Jones et al. 2001 ), Period04 (Lenz Breger 2005 ), gnuplot.