A. Akalin and E. Derman, $UBV$ photometry and period variations of V??839 Ophiuchi, Astronomy and Astrophysics Supplement Series, vol.125, issue.3, p.407, 1997.
DOI : 10.1051/aas:1997232

J. Daszynska-daszkiewicz, W. A. Dziembowski, and A. A. Pamyatnykh, Constraints on stellar convection from multi-colour photometry of $\delta$ Scuti stars, Astronomy & Astrophysics, vol.407, issue.3, p.999, 2003.
DOI : 10.1051/0004-6361:20030947

M. Dupret, J. De-ridder, and P. De-cat, A photometric mode identification method, including an improved non-adiabatic treatment of the atmosphere, Astronomy and Astrophysics, vol.398, issue.2, p.677, 2003.
DOI : 10.1051/0004-6361:20021679

M. S. Giampapa, J. C. Hall, R. R. Radick, and S. L. Baliunas, A Survey of Chromospheric Activity in the Solar???Type Stars in the Open Cluster M67, The Astrophysical Journal, vol.651, issue.1, p.444, 2006.
DOI : 10.1086/507624

R. L. Gilliland, T. M. Brown, and D. K. Duncan, Time-resolved CCD photometry of an ensemble of stars in the open cluster M67, The Astronomical Journal, vol.101, p.541, 1991.
DOI : 10.1086/115703

A. J. Grocholski and A. Sarajedini, WIYN Open Cluster Study - XVI. Optical/infrared photometry and comparisons with theoretical isochrones, Monthly Notices of the Royal Astronomical Society, vol.345, issue.3, p.1015, 2003.
DOI : 10.1046/j.1365-8711.2003.07028.x

J. R. Hurley, O. R. Pols, and S. J. Aarseth, A complete N-body model of the old open cluster M67, Monthly Notices of the Royal Astronomical Society, vol.363, issue.1, p.293, 2005.
DOI : 10.1111/j.1365-2966.2005.09448.x

J. B. Irwin, The Determination of a Light-Time Orbit., The Astrophysical Journal, vol.116, p.211, 1952.
DOI : 10.1086/145604

M. Jura, RV Tauri stars as post-asymptotic giant branch objects, The Astrophysical Journal, vol.309, p.732, 1986.
DOI : 10.1086/164642

B. Kalomeni, K. Yakut, and V. Keskin, Absolute Properties of the Binary System BB Pegasi, The Astronomical Journal, vol.134, issue.2, p.642, 2007.
DOI : 10.1086/519493

W. Landsman, R. C. Bohlin, and S. G. Neff, The Hot Stars of Old Open Clusters: M67, NGC 188, and NGC 6791, The Astronomical Journal, vol.116, issue.2, p.789, 1998.
DOI : 10.1086/300449

G. L. Loumos and T. J. Deeming, Spurious results from Fourier analysis of data with closely spaced frequencies, Astrophysics and Space Science, vol.169, issue.2, p.285, 1978.
DOI : 10.1007/BF01879560

R. D. Mathieu, M. Van-den-berg, and G. Torres, Sub-Subgiants in the Old Open Cluster M67?, The Astronomical Journal, vol.125, issue.1, p.246, 2003.
DOI : 10.1086/344944

K. A. Montgomery, L. A. Marschall, and K. A. Janes, CCD photometry of the old open cluster M67, The Astronomical Journal, vol.106, p.181, 1993.
DOI : 10.1086/116628

T. Pribulla and S. M. Rucinski, Contact Binaries with Additional Components. I. The Extant Data, The Astronomical Journal, vol.131, issue.6, p.2986, 2006.
DOI : 10.1086/503871

A. Pr?a and T. Zwitter, A Computational Guide to Physics of Eclipsing Binaries. I. Demonstrations and Perspectives, The Astrophysical Journal, vol.628, issue.1, p.426, 2005.
DOI : 10.1086/430591

S. Qian, L. Liu, B. Soonthornthum, L. Zhu, and J. He, Deep, Low Mass Ratio Overcontact Binary Systems. VI. AH Cancri in the Old Open Cluster M67, The Astronomical Journal, vol.131, issue.6, p.3028, 2006.
DOI : 10.1086/503561

S. M. Rucinski, A simple description of light curves of W UMa systems, Publications of the Astronomical Society of the Pacific, vol.105, p.1433, 1993.
DOI : 10.1086/133326

A. Sandage, L. M. Lubin, and D. A. Vandenberg, Parallaxes of G and K Subgiants, Publications of the Astronomical Society of the Pacific, vol.115, issue.812, p.1187, 2003.
DOI : 10.1086/378243

E. L. Sandquist, A high relative precision colour-magnitude diagram of M67, Monthly Notices of the Royal Astronomical Society, vol.347, issue.1, p.101, 2004.
DOI : 10.1111/j.1365-2966.2004.07174.x

E. L. Sandquist and M. D. Shetrone, Time Series Photometry of M67: W Ursae Majoris Systems, Blue Stragglers, and Related Systems, The Astronomical Journal, vol.125, issue.4, p.2173, 2003.
DOI : 10.1086/368139

E. L. Sandquist, D. W. Latham, and M. D. Shetrone, The Blue Straggler RS Canum Venaticorum Star S1082 in M67: A Detailed Light Curve and the Possibility of a Triple, The Astronomical Journal, vol.125, issue.2, p.810, 2003.
DOI : 10.1086/346087

A. Sarajedini, K. Brandt, and A. J. Grocholski, Color-Magnitude Diagrams, The Astronomical Journal, vol.127, issue.2, p.991, 2004.
DOI : 10.1086/381072

C. Sturch, A new UBV comparison of M67 and Hyades stars, Publications of the Astronomical Society of the Pacific, vol.85, p.724, 1973.
DOI : 10.1086/129534

B. J. Taylor, The Benchmark Cluster Reddening Project. II. A Reddening Value for M67, The Astronomical Journal, vol.133, issue.2, p.370, 2007.
DOI : 10.1086/509781

J. A. Whelan, W. Romanishin, and S. P. Worden, AH Cancri: a contact binary in M67, Monthly Notices of the Royal Astronomical Society, vol.186, issue.4, p.729, 1979.
DOI : 10.1093/mnras/186.4.729

R. E. Wilson, Binary-star light curve models, Publications of the Astronomical Society of the Pacific, vol.106, p.921, 1994.
DOI : 10.1086/133464

R. E. Wilson and E. J. Devinney, Realization of Accurate Close-Binary Light Curves: Application to MR Cygni, The Astrophysical Journal, vol.166, p.605, 1971.
DOI : 10.1086/150986

K. Yakut, On the Overcontact Binary V2388 Oph and An Improved M???R Relation for Ltcbs, Astrophysics and Space Science, vol.417, issue.1-4, p.273, 2005.
DOI : 10.1007/s10509-005-4829-9

K. Yakut and P. P. Eggleton, Evolution of Close Binary Systems, The Astrophysical Journal, vol.629, issue.2, p.1055, 2005.
DOI : 10.1086/431300

K. Yakut, C. Ibano?-glu, and B. Kalomeni, New light curve analysis and period changes of the overcontact binary XY Leonis, Astronomy & Astrophysics, vol.401, issue.3, p.1095, 2003.
DOI : 10.1051/0004-6361:20030193

Y. Yang, J. Dai, and X. Yin, Orbital Period Changes for the Weak-Contact Binary TY Bootis, The Astronomical Journal, vol.134, issue.1, p.179, 2007.
DOI : 10.1086/517876

X. B. Zhang, R. X. Zhang, and L. Deng, Photometric Study of AH Cancri, a W UMa-Type System in M67, The Astronomical Journal, vol.129, issue.2, p.979, 2005.
DOI : 10.1086/426914