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  Evolutionary states of red-giant stars from grid-based modelling

Hekker, S., Elsworth, Y., Basu, S., & Bellinger, E. P. (2017). Evolutionary states of red-giant stars from grid-based modelling. In EPJ Web of Conferences: Seismology of the Sun and the Distant Stars 2016. doi:10.1051/epjconf/201716004006.

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 Creators:
Hekker, Saskia1, Author              
Elsworth, Yvonne, Author
Basu, Sarbani, Author
Bellinger, Earl P.1, Author              
Affiliations:
1Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              

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 MPIS_GROUPS: Research Group SAGE
 Abstract: From its surface properties it can be di ffi cult to determine whether a red-giant star is in its helium- core-burning phase or only burning hydrogen in a shell around an inert helium core. Stars in either of these stages can have similar e ff ective temperatures, radii and hence luminosities, i.e. they can be located at the same position in the Hertzsprung-Russell diagram. Asteroseismology – the study of the internal structure of stars through their global oscillations – can provide the necessary additional constraints to determine the evolutionary states of red-giant stars. Here, we present a method that uses grid-based modelling based on global asteroseismic properties ( ν max , frequency of maximum oscillation power; and ∆ ν , frequency spacing between modes of the same degree and consecutive radial orders) as well as e ff ective temperature and metallicity to determine the evolutionary phases. This method is applicable even to timeseries data of limited length, although with a small fraction of miss-classifications.

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Language(s): eng - English
 Dates: 2018-02-022017
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/epjconf/201716004006
 Degree: -

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Title: TASC2 & KASC9 Workshop – SPACEINN & HELAS8 Conference
Place of Event: Angra do Heroísmo, Terceira-Açores, Portugal
Start-/End Date: 2016-07-11 - 2016-07-15

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Title: EPJ Web of Conferences : Seismology of the Sun and the Distant Stars 2016
Source Genre: Proceedings
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Pages: - Volume / Issue: 160 Sequence Number: 04006 Start / End Page: - Identifier: -