Low-Mass Star Formation, Triggered by Supernova in Primordial Clouds

摘要

The evolution of a gas shell, swept by the supernova remnant of a massivefirst generation star, is studied with H_2 and HD chemistry taken into account.When a first-generation star explodes as a supernova, H_2 and HD molecules areformed in the swept gas shell and effectively cool the gas shell totemperatures of 32 K - 154 K. If the supernova remnant can sweep to gather theambient gas, the gas shell comes to be dominated by its self-gravity, andhence, is expected to fragment. Our result shows that for a reasonable range oftemperatures (200 K - 1000 K) of interstellar gas, the formation ofsecond-generation stars can be triggered by a single supernova or hypernova.