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An ISO number density estimated from the discovery of `Oumuamua is so high ($\\sim 0.2$~au$^{-3}$) that Pop.~III survivors have chances at colliding with ISOs $\\gtrsim 10^5$ times per $1$~Gyr. `Oumuamua itself would be sublimated near Pop.~III survivors, since it has small size, $\\sim 100$~m. However, ISOs with size $\\gtrsim 3$~km would reach the Pop.~III survivor surfaces. 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Suzuki, Yasuo Doi","submitted_at":"2018-04-23T00:26:47Z","abstract_excerpt":"We calculate accretion mass of interstellar objects (ISOs) like `Oumuamua onto low-mass population III stars (Pop.~III survivors), and estimate surface pollution of Pop.~III survivors. An ISO number density estimated from the discovery of `Oumuamua is so high ($\\sim 0.2$~au$^{-3}$) that Pop.~III survivors have chances at colliding with ISOs $\\gtrsim 10^5$ times per $1$~Gyr. `Oumuamua itself would be sublimated near Pop.~III survivors, since it has small size, $\\sim 100$~m. However, ISOs with size $\\gtrsim 3$~km would reach the Pop.~III survivor surfaces. 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