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- W2116712221 abstract "We use differential CCD photometry to search for variability in BVI among 990 stars projected in and around the old open cluster M 67. In a previous paper we reported results for 22 cluster members that are optical counterparts to X-ray sources; this study focuses on the other stars in our observations. A variety of sampling rates were employed, allowing variability on time scales ranging from ~0.3 hours to ~20 days to be studied. Among the brightest sources studied, detection of variability as small as mmag is achieved (with > confidence); for the typical star observed, sensitivity to variability at levels mmag is achieved. The study is unbiased for stars with , , and within a radius of about 10 arcmin from the cluster centre. In addition, stars with were monitored in a few small regions in the cluster. We present photometry for all 990 sources studied, and report the variability characteristics of those stars found to be variable at a statistically significant level. Among the variables, we highlight several sources that merit future study, including stars located on the cluster binary sequence, stars on the giant branch, blue stragglers, and a newly discovered W UMa system." @default.
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- W2116712221 date "2002-02-01" @default.
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- W2116712221 title "Photometric variability in the old open cluster M 67" @default.
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- W2116712221 doi "https://doi.org/10.1051/0004-6361:20011737" @default.
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