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The strange evolution of the Large Magellanic Cloud Cepheid OGLE-LMC-CEP1812

Neilson, Hilding R., Izzard, Robert, Langer, Norbert and Ignace, Richard (2015) The strange evolution of the Large Magellanic Cloud Cepheid OGLE-LMC-CEP1812 Astronomy & Astrophysics, 581.

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Abstract

Classical Cepheids are key probes of both stellar astrophysics and cosmology as standard candles and pulsating variable stars. It is important to understand Cepheids in unprecedented detail in preparation for upcoming Gaia, James Webb Space Telescope (JWST) and extremely-large telescope observations. Cepheid eclipsing binary stars are ideal tools for achieving this goal, however there are currently only three known systems. One of those systems, OGLE-LMC-CEP1812, raises new questions about the evolution of classical Cepheids because of an apparent age discrepancy between the Cepheid and its red giant companion. We show that the Cepheid component is actually the product of a stellar merger of two main sequence stars that has since evolved across the Hertzsprung gap of the HR diagram. This post-merger product appears younger than the companion, hence the apparent age discrepancy is resolved. We discuss this idea and consequences for understanding Cepheid evolution.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Neilson, Hilding R.
Izzard, Robertr.izzard@surrey.ac.uk
Langer, Norbert
Ignace, Richard
Date : 15 September 2015
DOI : 10.1051/0004-6361/201526716
Depositing User : Karen Garland
Date Deposited : 04 Oct 2018 14:47
Last Modified : 04 Oct 2018 14:47
URI: http://epubs.surrey.ac.uk/id/eprint/849563

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