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We present the results of ultraviolet (UV) photometry of the old open clusterM67 obtained using Galaxy Evolution Explorer (GALEX) in far-ultraviolet (FUV)and near-ultraviolet (NUV) bands. UV detections of 18 blue straggler stars(BSSs), 3 white dwarfs (WDs), 4 yellow straggler stars, 2 sub-subgiants, and 25X-ray sources are presented (along with an online catalog). We demonstrate thecapability of UV colour magnitude diagrams (CMDs) along with the UV isochronesto identify potential stars which defy standard stellar evolution in this wellstudied cluster. We also detect a few main sequence turn-off and subgiantbranch stars with excess flux in the FUV and/or NUV. UV continuum excess aswell as Mg II $\it h$ +$\it k$ emission lines from the IUE archival spectra for2 red giants are detected, suggestive of their chromospheric activity. Wesuggest that a large number of stars in this cluster are chromosphericallyactive, whereas the bright BSS are unlikely to be active. We also estimate thefundamental parameters L/L$_{\odot}$, R/R$_{\odot}$ and T$_{eff}$ of the BSSsand 15 FUV bright stars by constructing the spectral energy distribution (SED)using multi-wavelength data. We identify three groups among the BSSs, based ontheir properties. The H-R diagram of BSSs with isochrones suggests that theBSSs in M67 are formed in the last 2.5 Gyr - 400 Myr, more or lesscontinuously. We identify 7 potential MS+WD candidates based on large UV excessfrom a probable 11, based on SEDs.

Ultraviolet stellar population of the old open cluster M67 (NGC 2682)