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<p>gravitationally deforming each other.</p>

<p><big>Orbital characteristics</big></p>
<p>In systems that satisfy the assumptions of the <a href="page.php?w=two-body_problem">two-body problem</a> - including having negligible <a href="page.php?w=Tidal_force">tidal</a> effects, perturbations (from the gravity of other bodies), and <a href="page.php?w=Mass_transfer">transfer of mass</a> between stars - the two stars will trace out a stable <a href="page.php?w=elliptical_orbit">elliptical orbit</a> around the <a href="page.php?w=barycenter">barycenter</a> of</p><p>
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