Search Publications
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…
Searching for Orbital Periods of Supergiant Fast X-ray Transients
Stella, L.; Walter, R.; Bozzo, E. +2 more
Building on the currently active program of observing High Mass X-ray Binaries (HMXBs), we describe here a challenging extension of the project for experienced AAVSO observers who want to push their observing to the limit. A new subclass of HMXBs, the Supergiant Fast X-ray Transients (SFXTs), have been recently discovered in INTEGRAL data and are …