Six contact binaries with P>0.5 d are classified as extremely low mass-ratio systems (q<0.15), and a compiled 218-system sample yields an extrapolated pre-merger cutoff mass ratio of 0.021.
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Extremely Low Mass Ratio Contact Binaries. II. The First Photometric and Spectroscopic Investigations of Six Systems with Orbital Periods Longer than 0.5 days
Six contact binaries with P>0.5 d are classified as extremely low mass-ratio systems (q<0.15), and a compiled 218-system sample yields an extrapolated pre-merger cutoff mass ratio of 0.021.