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Published July 21, 2021 | Version v1
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Validation of anomalous Cepheids with TESS

Description

TESS has a significant advantage in variable star classification over all-sky surveys that work with sparsely sampled photometric data. Beyond the classical problem of misidentified eclipsing and rotational variables among the pulsating stars, confusion between Cepheid types also exists. Here we focus on the anomalous Cepheid type of stars that lie in between Type I and II Cepheids regarding masses and luminosities. They represent the most metal poor and the least numerous type of Cepheids, for which evolutionary channels are a matter of debate. Their observed pulsation periods range between 0.3 to 2.7 days overlapping with the other Cepheids types and RR Lyrae stars, and their light curve shapes are very similar to each other. Photometric data alone are often not adequate to distinguish them, therefore only a handful of variable catalogs list anomalous Cepheids as an independent type. In this study we explore the potential of TESS in the validation of anomalous Cepheid candidates by investigating full-frame image light curves prepared with our differential photometric pipeline.

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2021TESSconf_eplachy.pdf

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