Red giants evolutionary status determination: the complete Kepler catalog
M. Vrard, M. H. Pinsonneault, Y. Elsworth, M. Hon, T. Kallinger, J. Kuszlewicz, B. Mosser, R. A. Garcia, J. Tayar, R. Bennett, K. Cao, S. Hekker, L. Loyer, S. Mathur, D. Stello

TL;DR
This study creates a comprehensive catalog of Kepler red giants, accurately classifying their evolutionary stages using multiple asteroseismic methods and comparing results with spectroscopic data to improve understanding of stellar evolution.
Contribution
The paper introduces a detailed classification of red giant evolutionary stages using six seismic techniques and compares these with spectroscopic data, clarifying boundaries and improving classification accuracy.
Findings
94% agreement between seismic and spectroscopic classification for RC stars
Identified a sharp surface gravity boundary at log(g)=2.99 for RC stars
Seismic methods for AGB/RGB distinction are consistent near RC but less so for evolved stars.
Abstract
Evolved cool stars have three distinct evolutionary status: shell Hydrogen-burning (RGB), core Helium and shell Hydrogen burning (RC), and double shell burning (AGB). Asteroseismology can distinguish between the RC and the other status, but distinguishing RGB and AGB has been difficult seismically and spectroscopically. The precise boundaries of different status in the HR diagram have also been difficult to establish. In this article, we present a comprehensive catalog of asteroseismic evolutionary status, RGB and RC, for evolved red giants in the Kepler field. We carefully examine boundary cases to define the lower edge of the RC phase in radius and surface gravity. We also test different published asteroseisemic methods claiming to distinguish AGB and RGB stars against a sample where AGB candidates were selected using a spectrocopic identification method. We used six different seismic…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astronomical Observations and Instrumentation
