Using photometric data collected by Evryscope-South we search for nearby young stars on the upper-main (UMS) and pre-main sequence (PMS). The Evryscopes are all-sky high-cadence telescope arrays operating in the Northern and Southern hemispheres, at Mount Laguna, California and Cerro Tololo, Chile. Evryscope-South surveys a roughly 8,000 sq. deg. field of view at 2-minute cadence, with the current database containing more than 16 million stars. Young upper-main and pre-main sequence stars and binaries contain variable systems that are highly useful in deriving relationships between fundamental stellar parameters and also serve as calibration points in current stellar models. Useful relationships between stellar rotation rates, activity, and age depend on long term monitoring of variable stars, and typically many challenges are presented in monitoring a large number of variable stars for long periods of time. Using the Zari et al. (2018) catalog of nearby (d<500pc), young, UMS and PMS stars we query the Evryscope-South database, returning 44,971 light curves. The light curves are surveyed for variability using both standard periodicity analysis as well as unique algorithms designed to find transiting events in the Evryscope datasets. In this poster I present the results of the survey; resulting in the recovery of 616 variable systems, with 301 of those being variable stars and the remaining 315 being eclipsing binary systems. Of those, 94 eclipsing binaries and 144 variable stars were previously unknown systems.
American Astronomical Society Meeting Abstracts #235
- Pub Date:
- January 2020