Query : 2015A&A...581L...1N

2015A&A...581L...1N - Astronomy and Astrophysics, volume 581, L1-1 (2015/9-1)

The strange evolution of the Large Magellanic Cloud Cepheid OGLE-LMC-CEP 1812.


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: evolution - stars: variables: Cepheids - stars: late-type

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 OGLE LMC-CEP-227 cC* 04 52 15.6979950672 -70 14 31.242378408     15.317   14.438 ~ 57 0
2 OGLE LMC-CEP-1718 cC* 05 21 54.9352576320 -69 21 50.365630728   15.706 15.190   14.511 ~ 23 0
3 SV* HV 12024 cC* 05 23 07.7071770176 -69 33 49.943900676     16.707   16.054 ~ 30 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17416 0

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