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arXiv · 1811.05219

TYC 3637-1152-1 - a High Amplitude delta Scuti star with peculiar pulsational properties

Ernst Paunzen·Klaus Bernhard·Moriz Frauenberger·Santiago Helbig·Andreas Herdin·Stefan Huemmerich·Jan Janik·Andreas Karnthaler·Richard Komzik·Beatrice Kulterer·Hans-Michael Maitzen·Stefan Meingast·Sebastian Miksch·Theodor Pribulla·Monika Rode-Paunzen·Wolfgang Sakuler·Carla Schoder·Eugene Semenko·Nikolaus Sulzenauer
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Abstract

In some delta Scuti stars, only one or two radial modes are excited (usually the fundamental mode and/or first overtone mode) and the observed peak-to-peak amplitudes exceed 0.3 mag (V). These stars are known as High Amplitude Delta Scuti (HADS) variables. We here present a detailed photometric and spectroscopic analysis of the HADS star TYC 3637-1152-1. We have derived a metallicity close to solar, a spectral type of F4V and an age of log t = 9.1. Employing archival time series data from different sources, two frequencies f0 =10.034 c/d and f1 =12.681 c/d and their harmonics and linear combinations were identified. The period ratio of f0/f1 = 0.791 puts this star into a peculiar position in the Petersen diagram, from which we conclude that TYC 3637-1152-1 is a unique object with peculiar pulsational properties that indicate a transitional state between HADS stars pulsating in the fundamental and first overtone modes and stars pulsating in higher overtones.

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Ernst Paunzen, Klaus Bernhard, Moriz Frauenberger, Santiago Helbig, Andreas Herdin, Stefan Huemmerich, Jan Janik, Andreas Karnthaler, Richard Komzik, Beatrice Kulterer, Hans-Michael Maitzen, Stefan Meingast, Sebastian Miksch, Theodor Pribulla, Monika Rode-Paunzen, Wolfgang Sakuler, Carla Schoder, Eugene Semenko, Nikolaus Sulzenauer. 2018-11-13. TYC 3637-1152-1 - a High Amplitude delta Scuti star with peculiar pulsational properties. https://doi.org/10.1016/j.newast.2018.10.001

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