Wind Roche-lobe Overflow in Low-Mass Binaries: Exploring the Origin of Rapidly Rotating Blue Lurkers
arxiv(2023)
摘要
Wind Roche-Lobe Overflow (WRLOF) is a mass-transfer mechanism proposed by
Mohamed and Podsiadlowski (2007) for stellar binaries wherein the wind
acceleration zone of the donor star exceeds its Roche lobe radius, allowing
stellar wind material to be transferred to the accretor at enhanced rates.
WRLOF may explain characteristics observed in blue lurkers and blue stragglers.
While WRLOF has been implemented in rapid population synthesis codes, it has
yet to be explored thoroughly in detailed binary models such as MESA (a 1D
stellar evolution code), and over a wide range of initial binary
configurations. We incorporate WRLOF accretion in MESA to investigate wide
low-mass binaries at solar metallicity. We perform a parameter study over the
initial orbital period and stellar mass. In most of the models where we
consider angular momentum transfer during accretion, the accretor is spun up to
the critical (or break-up) rotation rate. Then we assume the star develops a
boosted wind to efficiently reduce the angular momentum so that it could
maintain a sub-critical rotation. Balanced by boosted wind loss, the accretor
only gains ∼ 2% of its total mass, but can maintain a near-critical
rotation rate during WRLOF. Notably, the mass-transfer efficiency is
significantly smaller than in previous studies in which the rotation of the
accretor is ignored. We compare our results to observational data of blue
lurkers in M67 and find that the WRLOF mechanism can qualitatively explain the
origin of their rapid rotation, their location on the HR diagram and their
orbital periods.
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