Talk abstract details
Periodic patterns: a
Abstract
Delta Scuti pulsators are intermediate, main-sequence A-F stars with an historical interest for the field of stellar interiors. However, the low number of frequencies detected from ground-based observations and the absence of any structure in their frequency spectra (as in the solar-like case), made these objects dificult to properly model.
Nonetheless, the large amount of frequencies extracted from the CoRoT space light curves for some Delta Sct, the development of the non-perturbative pulsation theory for stars with high rotation rates and the discovery of structures in their frequency set, have re-awakened the interest in these classical pulsators.
In this work, we have used the most recent techniques (photometric and spectroscopic) to obtain as much information as it is nowadays possible for the Delta Sct star observed by CoRoT HD174966. We have compared these results with the most recent theories on modelling the pulsation, discussing the limits of the different techniques because of the high rotation of this star. And we have tried a different aproach to analyze the data searching for patterns in its frequency set.
Our results indicates that a clear pattern related to the large separation can be found within the pulsating spectrum of HD174966 and that it can be used to obtain the mean density of the star with an uncertainty lower than 6%. Evenmore, a diagram Echelle of the data suggests that a mode identification might be possible using the non-perturbative theory to compute the pulsating frequencies.
Nonetheless, the large amount of frequencies extracted from the CoRoT space light curves for some Delta Sct, the development of the non-perturbative pulsation theory for stars with high rotation rates and the discovery of structures in their frequency set, have re-awakened the interest in these classical pulsators.
In this work, we have used the most recent techniques (photometric and spectroscopic) to obtain as much information as it is nowadays possible for the Delta Sct star observed by CoRoT HD174966. We have compared these results with the most recent theories on modelling the pulsation, discussing the limits of the different techniques because of the high rotation of this star. And we have tried a different aproach to analyze the data searching for patterns in its frequency set.
Our results indicates that a clear pattern related to the large separation can be found within the pulsating spectrum of HD174966 and that it can be used to obtain the mean density of the star with an uncertainty lower than 6%. Evenmore, a diagram Echelle of the data suggests that a mode identification might be possible using the non-perturbative theory to compute the pulsating frequencies.