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<section id="periodic-variables-pnp">
<h1>Periodic Variables (pnp)<a class="headerlink" href="#periodic-variables-pnp" title="Link to this heading">¶</a></h1>
<p>Periodic Variables are objects that exhibit repeating sequences of values over a fixed length of time, known as the period.
Many astrophysical objects exhibit periodic behavior, including eclipsing binaries, pulsators, etc.</p>
<section id="classification-and-numbers">
<h2>Classification and numbers<a class="headerlink" href="#classification-and-numbers" title="Link to this heading">¶</a></h2>
<ul class="simple">
<li><p>Supertypes</p>
<ul>
<li><p>variable</p></li>
</ul>
</li>
<li><p>Subtypes</p>
<ul>
<li><p>Eclipsing</p></li>
<li><p>Sinusoidal</p></li>
<li><p>Sawtooth</p></li>
<li><p>Elliptical</p></li>
</ul>
</li>
</ul>
</section>
<section id="ztf-light-curves">
<h2>ZTF light curves<a class="headerlink" href="#ztf-light-curves" title="Link to this heading">¶</a></h2>
<p><img alt="ZTF periodic" src="_images/periodic.png" /></p>
<section id="description">
<h3>Description<a class="headerlink" href="#description" title="Link to this heading">¶</a></h3>
<p>Periodic variables have periods ranging from minutes to over a thousand days with millimagnitude to magnitude level variations.</p>
</section>
<section id="light-curve-characteristics">
<h3>Light curve characteristics<a class="headerlink" href="#light-curve-characteristics" title="Link to this heading">¶</a></h3>
<ul class="simple">
<li><p>periodic variable: objects that exhibit repeating sequences of values over a fixed length of time</p></li>
<li><p>period range: 0.001-1000 days</p></li>
<li><p>amplitude: varies from survey precision to more than a magnitude</p></li>
</ul>
<p><img alt="HR diagram of Periodic" src="_images/hr__periodic.png" /></p>
<p><img alt="RA/Dec diagram of Periodic" src="_images/radec__periodic.png" /></p>
</section>
</section>
<section id="references-and-further-reading">
<h2>References and further reading:<a class="headerlink" href="#references-and-further-reading" title="Link to this heading">¶</a></h2>
<ul class="simple">
<li><p>Drake et al., 2014, ApJS 618 213 9, The Catalina Surveys Periodic Variable Catalog <a class="reference external" href="https://arxiv.org/pdf/1405.4290.pdf">arxiv:1405.4290</a></p></li>
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