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Environmental Effects of Star-Forming Cores on Mass Accretion Rate

Shingo NozakiMasahiro N. Machida
Dec 2022
摘要
We calculate the evolution of cloud cores embedded in different envelopes toinvestigate environmental effects on the mass accretion rate onto protostars.As the initial state, we neglect the magnetic field and cloud rotation, andadopt star-forming cores composed of two parts: a centrally condensed core andan outer envelope. The inner core has a critical Bonnor-Ebert density profileand is enclosed by the outer envelope. We prepare 15 star-forming cores withdifferent outer envelope densities and gravitational radii, within which thegas flows into the collapsing core, and calculate their evolution until $\sim 2\times10^5$ yr after protostar formation. The mass accretion rate decreases asthe core is depleted when the outer envelope density is low. In contrast, themass accretion rate is temporarily enhanced when the outer envelope density ishigh and the resultant protostellar mass exceeds the initial mass of thecentrally condensed core. Some recent observations indicate that the mass ofprestellar cores is too small to reproduce the stellar mass distribution. Oursimulations show that the mass inflow from outside the core contributes greatlyto protostellar mass growth when the core is embedded in a high-densityenvelope, which could explain the recent observations.
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