In the figure shown below, the portion of the H-R diagram corresponding to the Hayashi track
of a 1 M_SUN star is shown.Temperature increases toward the left, and luminosity increases toward the top of the diagram.Even though the temperature of the protostar is hardly changing as it approaches the main sequence, its luminosity is decreasing.Why?

Question

In the figure shown below, the portion of the H-R diagram corresponding to the Hayashi track
of a 1 M_SUN star is shown.Temperature increases toward the left, and luminosity increases toward the top of the diagram.Even though the temperature of the protostar is hardly changing as it approaches the main sequence, its luminosity is decreasing.Why? In the figure shown below, the portion of the H-R diagram corresponding to the Hayashi track of a 1 M<sub>SUN</sub> star is shown.Temperature increases toward the left, and luminosity increases toward the top of the diagram.Even though the temperature of the protostar is hardly changing as it approaches the main sequence, its luminosity is decreasing.Why?

In the figure shown below, the portion of the H-R diagram corresponding to the Hayashi track of a 1 M<sub>SUN</sub> star is shown.Temperature increases toward the left, and luminosity increases toward the top of the diagram.Even though the temperature of the protostar is hardly changing as it approaches the main sequence, its luminosity is decreasing.Why?

Quizplus · Accepted Answer

The Answer of In the figure shown below, the portion of the H-R diagram corresponding to the Hayashi track of a 1 M_SUN star is shown.Temperature increases toward the left, and luminosity increases toward the top of the diagram.Even though the temperature of the protostar is hardly changing as it approaches the main sequence, its luminosity is decreasing.Why?

In the Figure Shown Below, the Portion of the H-R