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	It is pointed out that there is an upper limit to &lt;span class="d"&gt;the&lt;/span&gt; &lt;span class="d"&gt;brightness&lt;/span&gt; of &lt;span class="d"&gt;stars&lt;/span&gt;, beyond which no &lt;span class="d"&gt;star&lt;/span&gt; can exist. It is shown that this limit coincides with &lt;span class="d"&gt;the&lt;/span&gt; &lt;span class="d"&gt;brightness&lt;/span&gt; limit for which &lt;span class="d"&gt;the&lt;/span&gt; effective acceleration (i.e., &lt;span class="d"&gt;the&lt;/span&gt; sum of &lt;span class="d"&gt;the&lt;/span&gt; effects of gravitation and forces due to thermal, radiative, and turbulent pressure directed outward) drops to a very small value. In atmospheres of &lt;span class="d"&gt;the&lt;/span&gt; most extreme &lt;span class="d"&gt;stars&lt;/span&gt;, gravity waves can occur with very long wavelengths and elevated periods. It is suggested that it is these waves that are responsible for &lt;span class="d"&gt;the&lt;/span&gt; instabilities of supergiant and hypergiant &lt;span class="d"&gt;stars&lt;/span&gt;.&lt;/blockquote&gt;
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