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<title>Long Period Variables (lpv)</title>
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<section id="long-period-variables-lpv">
<h1>Long Period Variables (lpv)<a class="headerlink" href="#long-period-variables-lpv" title="Link to this heading">¶</a></h1>
<p>Long Period Variables have periods over several tens of days.
They incorporate various groups of cool luminous pulsators.
The canonical example is Mira.</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>
<li><p>periodic</p></li>
<li><p>pulsator</p></li>
</ul>
</li>
<li><p>Subtypes</p>
<ul>
<li><p>Miras</p></li>
<li><p>Semiregulars</p></li>
<li><p>OSARGs - OGLE Small Amplitude Red Giants (some astronomers do not include these under LPVs)</p></li>
</ul>
</li>
<li><p>Occurrence rate: very common, about 10<sup>5</sup> expected in ZTF data</p></li>
<li><p>Non LPV wth Long Periods</p>
<ul>
<li><p>RV Tau - Cepheid IIs</p></li>
</ul>
</li>
<li><p>Other possible confusions</p>
<ul>
<li><p>YSOs - their variations tend to be over shorter periods</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 lpv" src="_images/mira.png" />
<img alt="ZTF lpv" src="_images/srv.png" /></p>
<section id="description">
<h3>Description<a class="headerlink" href="#description" title="Link to this heading">¶</a></h3>
<p>Long period variables have periods from several tens of days to over thousand day and are
easy to identify due to the slow 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</p></li>
<li><p>period range: 100-1000 days</p></li>
<li><p>amplitude: over a mag (Mira), or a few tenths of a mag to 1 or 2 mags (semiregulars)</p></li>
<li><p>light curve shape:</p>
<ul>
<li><p>periodic sinusoidal (Mira)</p></li>
<li><p>semiregular (Semiregular)</p></li>
</ul>
</li>
</ul>
</section>
<section id="other-characteristics-and-selection-methods">
<h3>Other characteristics and selection methods<a class="headerlink" href="#other-characteristics-and-selection-methods" title="Link to this heading">¶</a></h3>
<ul class="simple">
<li><p>intrinsic lpv colors: red</p></li>
<li><p>absolute magnitude:</p></li>
</ul>
<p><img alt="HR diagram of LPV" src="_images/hr__lpv.png" /></p>
<p><img alt="RA/Dec diagram of LPV" src="_images/radec__lpv.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>Mowlawi et al., 2018, A&A 618, A58, The first Gaia catalogue of long-period variable candidates <a class="reference external" href="https://arxiv.org/pdf/1805.02035.pdf">arxiv:1805.02035</a></p></li>
<li><p>Soszynski et al., 2009, AcA, 59, 239S, The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. IV. Long-Period Variables in the Large Magellanic Cloud <a class="reference external" href="https://arxiv.org/pdf/0910.1354.pdf">arxix:0910.1354</a></p></li>
<li><p>Soszynski et al., 2008, AcA, 58, 293S, The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. II.Type II Cepheids and Anomalous Cepheids in the Large Magellanic Cloud <a class="reference external" href="https://arxiv.org/pdf/0811.3636.pdf">arxiv:0811.3636</a></p></li>
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