In an Open Cluster, the Sizes of Some of the Lower-Mass

question 16

Multiple Choice

In an open cluster, the sizes of some of the lower-mass stars may have been limited when the surrounding material the stars were accreting was blown away by ultraviolet radiation. What is the source of this UV radiation?

• A) The radiation sweeps generally through the Galaxy.
• B) The radiation comes from supernova explosions outside the cluster.
• C) The more massive O and B stars in the cluster evolve more quickly and produce ultraviolet radiation, while the less massive stars are still evolving toward the main sequence.
• D) The ultraviolet radiation is emitted by the low-mass stars themselves when they begin hydrogen burning.

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