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<section id="rr-lyrae-rrlyr">
<h1>RR Lyrae (rrlyr)<a class="headerlink" href="#rr-lyrae-rrlyr" title="Link to this heading">¶</a></h1>
<p>RR Lyrae are pulsating horizontal branch dA/dF stars with a mass 0.5 of Solar masses.
They are part of the main ‘instability strip’ in the HR-diagram,
where stars pulsate due to the double ionisation of He.
The two main subtypes are <code class="docutils literal notranslate"><span class="pre">ab</span></code> and <code class="docutils literal notranslate"><span class="pre">c</span></code>,</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>RR Lyrae ab</p></li>
<li><p>RR Lyrae c</p></li>
</ul>
</li>
<li><p>Occurrence rate: very common, about 10<sup>5</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 rrlyr ab" src="_images/rr_lyr_ab.png" />
<img alt="ZTF rrlyr c" src="_images/rr_lyr_c.png" /></p>
<section id="description">
<h3>Description<a class="headerlink" href="#description" title="Link to this heading">¶</a></h3>
<p>RR Lyrae (ab) are easy to recognise by their distinctive light curve shape and
high amplitude variability.
RR Lyrae (c) are a bit more of a challenge since their light curve shape is more sinusoidal.
For low-SNR cases they can sometimes be confused with contact binaries (EW),
which occur at similar periods and have sinusoidal-like light curves.</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: 0.2-1 days</p></li>
<li><p>amplitude: up to 1 mag (subtype ab), or 0.5 mag (subtype c)</p></li>
<li><p>light curve shape:</p>
<ul>
<li><p>sawtooth; steep rise and slow decay (subtype ab)</p></li>
<li><p>periodic sinusoidal (subtype c)</p></li>
</ul>
</li>
<li><p>can show modulation of the light curve shape on timescales of ~100 days (Blazhko effect)</p></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 RR Lyrae 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: -1<G<1</p></li>
</ul>
<p><img alt="HR diagram of RRlyrae" src="_images/hr__rr_lyr.png" /></p>
<p><img alt="RA/Dec diagram of RRlyrae" src="_images/radec__rr_lyr.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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