2 papers
astro-ph2001
Photometric variability in the old open cluster M 67. II. General Survey
K. G. Stassun, M. van den Berg, R. D. Mathieu +1
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 2…
astro-ph2001
Photometric variability in the open cluster M67 I. Cluster members detected in X-rays
Maureen van den Berg, Keivan Stassun, Frank Verbunt +1
We study photometric variability among the optical counterparts of X-ray sources in the old open cluster M67. The two puzzling binaries below the giant branch are both variables: f…