Long-Period High-Amplitude Red Variables in the KELT Survey. (arXiv:2001.06498v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Arnold_R/0/1/0/all/0/1">R. Alex Arnold</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McSwain_M/0/1/0/all/0/1">M. Virginia McSwain</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pepper_J/0/1/0/all/0/1">Joshua Pepper</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Whitelock_P/0/1/0/all/0/1">Patricia A. Whitelock</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hernitschek_N/0/1/0/all/0/1">Nina Hernitschek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+James_D/0/1/0/all/0/1">David J. James</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kuhn_R/0/1/0/all/0/1">Rudolf B. Kuhn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lund_M/0/1/0/all/0/1">Michael B. Lund</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rodriguez_J/0/1/0/all/0/1">Joseph E. Rodriguez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Siverd_R/0/1/0/all/0/1">Robert J. Siverd</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stassun_K/0/1/0/all/0/1">Keivan G. Stassun</a>
We present a sample of 4,132 Mira-like variables (red variables with long
periods and high amplitudes) in the Kilodegree Extremely Little Telescope
(KELT) survey. Of these, 814 are new detections. We used 2MASS colors to
identify candidate asymptotic giant branch (AGB) stars. We tested for
photometric variability among the sample and used Lomb-Scargle to determine the
periodicity of the variable sample. We selected variables with high amplitudes
and strong periodic behavior using a Random Forest classifier. Of the sample of
4,132 Mira-like variables, we estimate that 70% are Miras, and 30% are
semi-regular (SR) variables. We also adopt the method of using (W_{RP} –
W_{K_s}) vs. (J – K_s) colors (Lebzelter et al. 2018) in distinguishing between
O-rich and C-rich Miras and find it to be an improvement over 2MASS colors.
We present a sample of 4,132 Mira-like variables (red variables with long
periods and high amplitudes) in the Kilodegree Extremely Little Telescope
(KELT) survey. Of these, 814 are new detections. We used 2MASS colors to
identify candidate asymptotic giant branch (AGB) stars. We tested for
photometric variability among the sample and used Lomb-Scargle to determine the
periodicity of the variable sample. We selected variables with high amplitudes
and strong periodic behavior using a Random Forest classifier. Of the sample of
4,132 Mira-like variables, we estimate that 70% are Miras, and 30% are
semi-regular (SR) variables. We also adopt the method of using (W_{RP} –
W_{K_s}) vs. (J – K_s) colors (Lebzelter et al. 2018) in distinguishing between
O-rich and C-rich Miras and find it to be an improvement over 2MASS colors.
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