CCD Photometry of Faint Variable Stars in the Field of the Globular Cluster M4

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Scientific paper

We present the results of a photometric survey for faint variable stars in the nearby globular cluster M4. Twelve variables were discovered. Seven of the twelve are W Ursa Majoris stars that are probable members of the cluster. Another variable is faint blue degenerate star with a period of about 60 minutes. While the magnitude and colors of this star are consistent with those of a cataclysmic variable in M4, a spectrum shows no emission lines.

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