TYC 3637-1152-1-A high amplitude delta Scuti star with peculiar pulsational properties

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PAUNZEN Ernst BERNHARD Klaus FRAUENBERGER Moriz HELBIG Svetlana HERDIN Andreas HÜMMERICH Stefan JANÍK Jan KARNTHALER Andreas KOMŽÍK Richard Milan KULTERER Beatrice MAITZEN Hainz-Michael MEINGAST Stefan MIKSCH Sebastian PRIBULLA Theodor RODE-PAUNZEN Monika SAKULER Wolfgang SCHODER Carla SEMENKO Eugene SULZENAUER Nikolaus

Druh Článek v odborném periodiku
Časopis / Zdroj New Astronomy
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.1016/j.newast.2018.10.001
Klíčová slova Stars: variables: delta Scuti; Stars: individual: TYC 3637-1152-1
Popis 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 F4 V and an age of log t = 9.1. Employing archival time series data from different sources, two frequencies f(0) = 10.034 c/d and f(1) = 12.681 c/d and their harmonics and linear combinations were identified. The period ratio of f(0)/f(1), = 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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