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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Metal pollution of low-mass Population III stars through accretion of interstellar objects like 'Oumuamua
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Metal pollution of low-mass Population III stars through accretion of interstellar objects like 'Oumuamua

机译：低质量群体III星的金属污染通过围灰体对象的影响，如'OUMuamua

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摘要

We calculate the accretion mass of interstellar objects (ISOs) like 'Oumuamua on to low-mass Population III stars (Pop. III survivors), and estimate the surface pollution of Pop. III survivors. The ISO number density estimated from the discovery of 'Oumuamua is so high (similar to 0.2 au(-3)) that Pop. III survivors have chances of colliding with ISOs greater than or similar to 10(5) times per 1 Gyr. 'Oumuamua itself would be sublimated near Pop. III survivors, since its size is small; similar to 100 m. However, ISOs with size greater than or similar to 3 km would reach the Pop. III survivor surfaces. Supposing an ISO cumulative number density with size larger than D is n alpha D-alpha, Pop. III survivors can accrete ISO mass greater than or similar to 10(-16) M-circle dot, or ISO iron mass greater than or similar to 10(-17)M(circle dot), if alpha < 4. This iron mass is larger than the accretion mass of interstellar medium (ISM) by several orders of magnitude. Taking into account material mixing in the convection zone of Pop. III survivors, we find that their surface pollution is typically [Fe/H] less than or similar to -8 in most cases; however, the surface pollution of Pop. III survivors with 0.8M(circle dot) can be [Fe/H] greater than or similar to -6 because of the very shallow convective layer. If we consider Pop. III survivors located at the Galactocentric distance of 8 kpc, the dependence of the metal pollution is as follows. If a > 4, Pop. III survivors have no chance at colliding with ISOs with D greater than or similar to 3 km, and remain metal-free. If 3 < alpha < 4, Pop. III survivors would be most polluted by ISOs up to [Fe/H] similar to -7. If alpha < 3 up to D similar to 10 km, Pop. III survivors could hide in metal-poor stars so far discovered. Pop. III survivors would be more polluted with decreasing Galactocentric distance. Although the metal pollution depends on a and the Galactocentric distance, we first show the importance of ISOs for the metal pollution of Pop. III survivors.
机译：我们计算“Oumuamua on to低质量人口III恒星（POP。III幸存者）等壁炉物体（ISOS）的吸收质量，并估计流行的表面污染。 III幸存者。从“OuMuamua的发现”估计的ISO数密度如此之高（类似于0.2 AU（-3））弹出。 III幸存者有可能与ISOS碰撞大于或类似于每1克拉的10（5）次。 'Oumuamua本身将在POP附近升华。 III幸存者，因为它的大小很小;类似于100米。然而，尺寸大于或类似于3公里的ISO将到达流行音乐。 III幸存者表面。假设大小大于d的ISO累积数密度为N alpha D-alpha，pop。 III幸存者可以高于或类似于10（-16）m圆点的ISO质量，或者ISO铁质量大于或类似于10（-17）m（圆点），如果alpha <4。该铁物质是大于几个数量级的星际介质（ISM）的增生质量大。考虑到流行音乐的对流区域中的材料混合。 III幸存者，我们发现它们的表面污染通常在大多数情况下少于或类似于-8;但是，流行的表面污染。 III幸存者，0.8M（圆点）可以是[Fe / H]，而不是-6，因为具有非常浅的对流层。如果我们考虑流行音乐。 III幸存者位于8kpc的半乳腺距离，金属污染的依赖性如下。如果是一个> 4，pop。 III幸存者没有机会与D的isos大于或类似于3公里，保持无金属。如果3

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