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http://dx.doi.org/10.5467/JKESS.2007.28.1.087

A Search for New Variable Stars in the Open Cluster NGC 129 using a Small Telescope  

Lee, Eun-Jung (Department of Earth Science Education, Korea National University of Education)
Jeon, Young-Beom (Korea Astronomy and Space Science Institute)
Lee, Ho (Department of Earth Science Education, Korea National University of Education)
Park, Hong-Suh (Department of Earth Science Education, Korea National University of Education)
Publication Information
Journal of the Korean earth science society / v.28, no.1, 2007 , pp. 87-104 More about this Journal
Abstract
As part of the SPVS (Short-Period Variability Survey) which is a wide-field $(90 photometric monitering program at Bohyunsan Optical Astronomy (BOAO), we performed V band time-series CCD photometric observations ofthe young open cluster NGC 129 for 11 nights between October 12, 2004 and November 3, 2005 using the 155mm refractor equipped with $3K{\times}2K$ CCD camera. From the observation we obtained 2400 V band CCD frames and color-magnitude diagram of the cluster. To transform instrumental magnitude to standard magnitude, we applied ensemble normalization technique to all observed time-series data. After the photometric reduction process, we examined variations of 9537 stars. As a result, sixty six of the new variable stars were discovered. To determine the periods of the sevariables, we used DFT(Discrete Fourier Transform) and phase-matching technique. According to light curve shape, period, amplitude and the position on a C-M diagram, we classified these variables as 9 SPB type, 9 ${\delta}$ Scuti type, 29 eclipsing, 17 long term variables. However, two of them were not classified. From this study, we learned that small telescopes could be a very useful tool to observe variable stars in the open cluster in survey program.
Keywords
observations; wide-field; stars; variables;
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