Question

These systems are the typical holders of high values of Gaia's RUWE ("ROO-wee") statistic. Blue stragglers may form from these systems following the development of a common envelope. X-ray emissions result from the asymmetry of a (20[1])compact object in these systems whose mass is typically measured up to a factor of the sine of the inclination angle. The "contact" (20[1])type of these systems (20[1])fill both of their (*) Roche (10[1])lobes, facilitating (10[1])mass transfer through the (0[1])L1 Lagrange (10[1])point. (10[1])These (0[1])non-planetary systems are "spectroscopic" when detected by changes (10[1])in radial velocity, and are "visual" (0[1])if the mutual orbit of their members can be observed (10[1])directly. For 10 points, name these systems containing two stars. ■END■ (10[3])

ANSWER: stellar binaries [or binary stars or binary star systems or binary stellar systems; accept contact binaries or X-ray binaries or spectroscopic binaries or visual binaries; prompt on multiple stellar systems or multiple star systems or two-body systems; reject "double stars"]
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