On the asymptotic acoustic-mode phase in red-giant stars and its dependence on evolutionary state

Abstract

Asteroseismic investigations based on the wealth of data now available,in particular from the CoRoT and Kepler missions, require a good understanding of the relation between the observed quantities and the properties of the underlying stellar structure. Kallinger et al. 2012 found a relation between their determination of the asymptotic phase of radial oscillations in evolved stars and the evolutionary state, separating ascending-branch red giants from helium-burning stars in the `red clump'. Here we provide a detailed analysis of this relation, which is found to derive from differences between these two classes of stars in the thermodynamic state of the convective envelope. There is potential for distinguishing red giants and clump stars based on the phase determined from observations that are too short to allow distinction based on determination of the period spacing for mixed modes. The analysis of the phase may also point to a better understanding of the potential for using the helium-ionization-induced acoustic glitch to determine the helium abundance in the envelopes of these stars.

MNRAS, in the press

References in corpus (6)

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• Asteroseismology of the Hyades red giant and planet host epsilon Tauri
• Fast and Automated Peak Bagging with DIAMONDS (FAMED)
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• Seismic constraints on the internal structure of evolved stars: From high-luminosity RGB to AGB stars
• Unveiling the Structure and Dynamics of Red Giants with Asteroseismology
• Multi-campaign Asteroseismic Analysis of eight Solar-like pulsating stars observed by the K2 mission
• Revisiting the Red-giant Branch Hosts KOI-3886 and $\iota$ Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
• Asteroseismology of the G8 subgiant beta Aquilae with SONG-Tenerife, SONG-Australia and TESS
• Asteroseismology of red giants & galactic archaeology
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• Asteroseismology of iota Draconis and Discovery of an Additional Long-Period Companion