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The ATLAS All-Sky Stellar Reference Catalog
Wolf, C.; Smartt, S. J.; Stalder, B. +6 more
The Asteroid Terrestrial-impact Last Alert System (ATLAS) observes most of the sky every night in search of dangerous asteroids. Its data are also used to search for photometric variability, where sensitivity to variability is limited by photometric accuracy. Since each exposure spans 7.°6 corner to corner, variations in atmospheric transparency i…
Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation
Choi, Jieun; Conroy, Charlie; Dotter, Aaron +4 more
The Hyades, Praesepe, and Pleiades are well-studied stellar clusters that anchor important secondary stellar age indicators. Recent studies have shown that main sequence turn off based ages for these clusters may depend on the degree of rotation in the underlying stellar models. Rotation induces structural instabilities that can enhance the chemic…
New and Known Moving Groups and Clusters Identified in a Gaia Comoving Catalog
Faherty, Jacqueline K.; Gagné, Jonathan; Bochanski, John J. +5 more
We present a reorganization of the Oh et al. wide, comoving catalog of 4555 groups of stars (10,606 individual objects) identified in the Tycho Gaia Astrometric Survey (TGAS) into new and known coevolving groups of stars in the Milky Way. We use the BANYAN Σ kinematic analysis tool to identify 1015 individual stars in the Oh et al. catalog that yi…
Hubble Space Telescope Trigonometric Parallax of Polaris B, Companion of the Nearest Cepheid
Schaefer, Gail H.; Nelan, Edmund P.; Bond, Howard E. +2 more
Polaris, the nearest and brightest Cepheid, is a potential anchor point for the Leavitt period-luminosity relation. However, its distance is a matter of contention, with recent advocacy for a parallax of ∼10 mas, in contrast with the Hipparcos measurement of 7.54 ± 0.11 mas. We report an independent trigonometric parallax determination, using the …
Deconvolving the HD 81809 Binary: Rotational and Activity Evidence for a Subgiant with a Sun-like Cycle
Egeland, Ricky
HD 81809 has one of the highest quality activity cycles from the sample of stars synoptically observed in the Mount Wilson Observatory HK Project. However, this object is in fact a binary system, raising the question as to which of the components is responsible for the observed cyclic activity and what are the properties of that active component. …