TYC 3637-1152-1 – a High Amplitude delta Scuti star with peculiar pulsational properties. (arXiv:1811.05219v1 [astro-ph.SR])

TYC 3637-1152-1 – a High Amplitude delta Scuti star with peculiar pulsational properties. (arXiv:1811.05219v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Paunzen_E/0/1/0/all/0/1">Ernst Paunzen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bernhard_K/0/1/0/all/0/1">Klaus Bernhard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Frauenberger_M/0/1/0/all/0/1">Moriz Frauenberger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Helbig_S/0/1/0/all/0/1">Santiago Helbig</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Herdin_A/0/1/0/all/0/1">Andreas Herdin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Huemmerich_S/0/1/0/all/0/1">Stefan Huemmerich</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Janik_J/0/1/0/all/0/1">Jan Janik</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Karnthaler_A/0/1/0/all/0/1">Andreas Karnthaler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Komzik_R/0/1/0/all/0/1">Richard Komzik</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kulterer_B/0/1/0/all/0/1">Beatrice Kulterer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Maitzen_H/0/1/0/all/0/1">Hans-Michael Maitzen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Meingast_S/0/1/0/all/0/1">Stefan Meingast</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Miksch_S/0/1/0/all/0/1">Sebastian Miksch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pribulla_T/0/1/0/all/0/1">Theodor Pribulla</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rode_Paunzen_M/0/1/0/all/0/1">Monika Rode-Paunzen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sakuler_W/0/1/0/all/0/1">Wolfgang Sakuler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schoder_C/0/1/0/all/0/1">Carla Schoder</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Semenko_E/0/1/0/all/0/1">Eugene Semenko</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sulzenauer_N/0/1/0/all/0/1">Nikolaus Sulzenauer</a>

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.

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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