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- W2896516659 abstract "We present the analysis of a peculiar W~Virginis (pWVir) type-II Cepheid, OGLE-LMC-T2CEP-211 ($P_{puls}=9.393,d$), in a double-lined binary system ($P_{orb}=242,d$), which shed light on virtually unknown evolutionary status and structure of pWVir stars. The dynamical mass of the Cepheid (first ever for a type-II Cepheid) is $0.64pm{}0.02,M_odot$ and the radius $R=25.1pm{}0.3,R_odot$. The companion is a massive ($5.67,M_odot$) main-sequence star obscured by a disk. Such configuration suggests a mass transfer in the system history. We found that originally the system ($P_{orb}^{init}=12,d$) was composed of $3.5$ and $2.8,M_odot$ stars, with the current Cepheid being more massive. The system age is now $sim{}$200 My, and the Cepheid is almost completely stripped of hydrogen, with helium mass of $sim{}92%$ of the total mass. It finished transferring the mass 2.5 My ago and is evolving towards lower temperatures passing through the instability strip. Comparison with observations indicate a reasonable $2.7cdot{}10^{-8},M_odot/y$ mass loss from the Cepheid. The companion is most probably a Be main-sequence star with $T=22000,K$ and $R=2.5,R_odot$. Our results yield a good agreement with a pulsation theory model for a hydrogen-deficient pulsator, confirming the described evolutionary scenario. We detected a two-ring disk ($R_{disk}sim,116,R_{odot}$) and a shell ($R_{shell}sim,9,R_{odot}$) around the companion, that is probably a combination of the matter from the past mass transfer, the mass being lost by the Cepheid due to wind and pulsations, and a decretion disk around a rapidly rotating secondary. Our study together with observational properties of pWVir stars suggests that their majority are products of a similar binary evolution interaction." @default.
- W2896516659 created "2018-10-26" @default.
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- W2896516659 date "2018-11-15" @default.
- W2896516659 modified "2023-10-05" @default.
- W2896516659 title "The Dynamical Mass and Evolutionary Status of the Type II Cepheid in the Eclipsing Binary System OGLE-LMC-T2CEP-211 with a Double-ring Disk" @default.
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- W2896516659 doi "https://doi.org/10.3847/1538-4357/aae68f" @default.
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