Photometry of Fifteen New Variable Sources Discovered by IMSNG

Volume 46 number 2 (2018)

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Seoyeon Choi

Phillips Academy, 180 Main St, Andover, MA 01810; schoi1@andover.edu

Myungshin Im

Center for the Exploration of the Universe (CEOU), Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea; mim@astro.snu.ac.kr

Changsu Choi

Center for the Exploration of the Universe (CEOU), Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea; changsu@astro.snu.ac.kr

Abstract

We report the discovery of fifteen new variable objects from data taken in the course of a survey that monitors nearby galaxies to uncover the onset of supernovae. A light curve was generated for each variable star candidate and was evaluated for variability in brightness and periodicity. Three objects were determined as periodic variables through period analysis using vstar. Nearly periodic, short-duration dips are found for three objects, and these objects are likely to be eclipsing binaries. Variability of the remaining sources are rather random, and we were not able to conclude whether they are irregular variables or not from a lack of data.