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tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for useful comments and Pierre Bergeron for helpful discussions. The work of DMB, AVK, and DAZ (Sections 2 and 3 ) was supported by the Russian Foundation for Basic Research, project No. 18-32-00781 mol_a. AYuK and SVZ acknowledge PAPIIT grant IN-100617 for resources provided towards this research. The work is based on observations made with the Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma. iraf is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. DAZ thanks Pirinem School of Theoretical Physics for hospitality.