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<section id="delta-scuti-dscu">
<h1>Delta Scuti (dscu)<a class="headerlink" href="#delta-scuti-dscu" title="Link to this heading">¶</a></h1>
<p>Delta Scuti variables are classic pulsating stars (i.e., they are stars passing through the <a class="reference external" href="https://en.wikipedia.org/wiki/Instability_strip">instability strip</a>). As these stars expand and contract (i.e. pulsate) their size and temperature changes leading to regular, smooth variations in their brightness. Delta Scuti stars are smaller than both Cepheids and RR Lyrae stars, which leads to a short period of oscillations (typically anywhere between 0.03 days and 0.3 days).</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>Occurrence rate: very common, about 10<sup>4</sup> expected in ZTF data</p></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 delta_scuti" src="_images/delta_scuti.png" /></p>
<section id="description">
<h3>Description<a class="headerlink" href="#description" title="Link to this heading">¶</a></h3>
<p>Delta Scuti are easy to recognise by their distinctive light curve shape and period range, which distinguishes them from RR Lyrae and Cepheids.</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: 0.03-0.3 days</p></li>
<li><p>amplitude: Small amplitude (between 0.05 and 0.3)</p></li>
<li><p>light curve shape:</p>
<ul>
<li><p>smooth, sawtooth variations (blue/green filters show stronger sawtooth pattern); steep rise and slow decay</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 Delta Scuti colors: blue, that of A/F type main sequence stars (g-r = -0.1 – 0.5).
Reddening can be significant since these stars can be detected at large distances.</p></li>
<li><p>absolute magnitude: 0<G<5</p></li>
</ul>
<p><img alt="HR diagram of Delta Scuti" src="_images/hr__delta_scuti.png" /></p>
<p><img alt="RA/Dec diagram of Delta Scuti" src="_images/radec__delta_scuti.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>Sterken & Jasschek: Light curves of variable stars</p></li>
</ul>
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