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Deep Infrared ZAMS Fits to Benchmark Open Clusters Hosting Delta Scuti Stars

Turner, D. G.; Majaess, D. J.; Lane, D. J. +1 more

This research aims to secure precise distances for cluster δ Scuti stars in order to investigate their properties via a VI Wesenheit framework. Deep JHKs color-color and zero-age main sequence (ZAMS) relations derived from ~700 unreddened stars featuring 2MASS photometry and precise Hipparcos parallaxes (d≤25 pc) are applied to establish distances…

Anchoring the Universal Distance Scale Via a Wesenheit Template

Henden, A. A.; Turner, D. G.; Majaess, D. J. +2 more

A VI Wesenheit diagram featuring SX Phoenicis, δ Scuti, RR Lyrae, and type II and classical Cepheid variables is calibrated by means of geometric-based distances inferred from HST, Hipparcos, and VLBA observations (n = 30). The distance to a target population follows from the offset between the observed Wesenheit magnitudes and the calibrated temp…