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Direct Evidence for Stellar Initial Mass Function Variation in the Milky Way

  • Authors: Charles L. Steinhardt, Carter Meyerhoff, Alexander J. Luening

Charles L. Steinhardt et al 2026 The Astrophysical Journal Letters 1005 .

  • Provider: AAS Journals

Caption: Figure 4.

Observed stellar mass functions for four different open clusters from the E. L. Hunt & S. Reffert (2023) catalog. The break masses are different for each cluster. This cannot be due to subsequent stellar evolution or dynamical disruption, and thus must be caused by variation in the IMF.

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