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Title:
Observation Of New Variable Stars In The Field Of Open Cluster M23
Authors:
Wilkerson, Jeffrey A.; Brown, T. S.; Frank, K. A.; Joshi, U.; Lacoul, B. K.; Rengstorf, N. P.; Schiefelbein, A. M.
Affiliation:
AA(Luther College), AB(Luther College), AC(Luther College), AD(Luther College), AE(Luther College), AF(Luther College), AG(Luther College)
Publication:
American Astronomical Society Meeting 210, #13.01; Bulletin of the American Astronomical Society, Vol. 38, p.111
Publication Date:
05/2007
Origin:
AAS
Bibliographic Code:
2007AAS...210.1301W

Abstract

In 2002 a program of surveying regions containing bright open star clusters was initiated using the observing facilities at Luther College. As part of this program the half degree square field containing open cluster M23 was observed in 2003, 2005 and 2006, resulting in approximately 45,000 2.5-second images, 45,000 3.5-second images and 65,000 5.0-second images. The data set contains images from 94 nights spanning a time range from JD 2452810 to JD 2454005. We have searched for stellar variability on timescales from seconds to years in approximately 1600 stars in this field. Unambiguous variability is apparent in 30 stars ranging in magnitude from about 10 to 17. Twenty-eight of these stars have not been previously reported as variable. Seven of the stars are eclipsing binaries, including two apparent W UMa-type contact binaries and one additional eclipsing binary with a period shorter than 0.6 days. The remaining 23 variables are red pulsating stars with long periods. Most of these stars have amplitudes smaller than two magnitudes and periods between 200 and 400 days. Thus, they are likely Semi-Regular variables. We present celestial coordinates, estimated amplitude and estimated period for each of these stars, as well as several selected light curves. Finally, we have performed low-precision BVRI photometry of the field and have placed most of the observed variables on color magnitude diagrams. We are grateful for support from the Roy J. Carver Charitable Trust and the R. J. McElroy Trust.
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