Haverford College Haverford Scholarship Faculty Publications Astronomy 2005 Time-Series Ensemble Photometry and the Search for Variable Stars in the Open Cluster M11 Jonathan Hargis Haverford College,
[email protected] E. L. Sandquist D. H. Bradstreet Follow this and additional works at: https://scholarship.haverford.edu/astronomy_facpubs Repository Citation J. R. Hargis, E. L. Sandquist, D. H. Bradstreet, Time-Series Ensemble Photometry and the Search for Variable Stars in the Open Cluster M11, 2005, The Astronomical Journal, 130, 2824. This Journal Article is brought to you for free and open access by the Astronomy at Haverford Scholarship. It has been accepted for inclusion in Faculty Publications by an authorized administrator of Haverford Scholarship. For more information, please contact
[email protected]. The Astronomical Journal, 130:2824–2837, 2005 December # 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A. TIME-SERIES ENSEMBLE PHOTOMETRY AND THE SEARCH FOR VARIABLE STARS IN THE OPEN CLUSTER M11 Jonathan R. Hargis1 and Eric L. Sandquist Department of Astronomy, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182;
[email protected],
[email protected] and David H. Bradstreet Department of Physical Sciences, Eastern University, 1300 Eagle Road, St. Davids, PA 19087-3696;
[email protected] Received 2005 May 23; accepted 2005 August 9 ABSTRACT This work presents the first large-scale photometric variability survey of the intermediate-age (200 Myr) open cluster M11. Thirteen nights of data over two observing seasons were analyzed (using crowded field and ensemble photometry techniques) to obtain high relative precision photometry. In this study we focus on the detection of can- didate member variable stars for follow-up studies.