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MOST satellite photometry of stars in the M67 field: eclipsing binaries, blue stragglers and δ Scuti variables
We present two series of MOST (Microvariability and Oscillations ofSTars) space-based photometry, covering nearly continuously 10 d in 2004and 30 d in 2007, of selected variable stars in the upper main sequenceof the old open cluster M67. New high-precision light curves wereobtained for the blue straggler binary/triple systems AH Cnc, ES Cnc andEV Cnc. The precision and phase coverage of ES Cnc and EV Cnc is by farsuperior to any previous observations. The light curve of ES Cnc ismodelled in detail, assuming two dark photospheric spots and Rochegeometry. An analysis of the light curve of AH Cnc indicates a low massratio (q ~ 0.13) and a high inclination angle for this system. Two newlong-period eclipsing binaries, GSC 814-323 and HD 75638 (non-members ofM67) were discovered. We also present ground-based DDO spectroscopy ofES Cnc and of the newly found eclipsing binaries. Especially interestingis HD 75638, a member of a visual binary, which must itself be a tripleor a higher multiplicity system. New light curves of two δ Scutipulsators, EX Cnc and EW Cnc, have been analysed leading to detection of26 and eight pulsation frequencies of high temporal stability.Based on photometric data from MOST, a Canadian Space Agency mission(jointly operated by Dynacon Inc., the University of Toronto Institutefor Aerospace Studies and the University of British Columbia, with theassistance of the University of Vienna), and on spectroscopic data fromthe David Dunlap Observatory, University of Toronto.E-mail: pribulla@ta3.sk (TP); rucinski@astro.utoronto.ca (SR)
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