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Close binary evolution based on Gaia DR2: the origin of late WC-type Wolf-Rayet stars with low luminosity

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arxiv 2111.13305 v1 pith:FHLVDTCR submitted 2021-11-26 astro-ph.SR

Close binary evolution based on Gaia DR2: the origin of late WC-type Wolf-Rayet stars with low luminosity

classification astro-ph.SR
keywords starsevolutionaryluminositywolf-rayetbelowbinariesbinarycannot
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The observed late-type WC Wolf-Rayet stars (WC7-9) with low luminosity below $\rm \log L/L_{\odot} < 5.4$ in the HR diagram cannot be reproduced satisfactorily by the evolutionary track of single stars. The mass transfer due to Roche lobe overflow drastically modifies the internal structure and surface compositions of two components. Therefore, binaries provide a very promising evolutionary channel to produce these WC stars.

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