Question

wednesday 9-10
find the quadrant that contains
the hot, dim stars. name a star
from this quadrant and identify
its classification.

Explanation:

Step1: Analyze HR Diagram Axes

The Hertzsprung - Russell (HR) diagram has surface temperature (decreasing to the right) and brightness (increasing upward). Hot stars have high surface temperature (left side), dim stars have low brightness (bottom). So hot, dim stars are in the bottom - left quadrant, which is quadrant 3 (or check the diagram: quadrant 3 is bottom - left with high temp, low brightness).

Step2: Identify Star in Quadrant 3

Stars like Sirius B or Procyon B (or others in the white dwarfs region, which is in quadrant 3) are in this quadrant. For example, Sirius B: its classification is a white dwarf. White dwarfs are hot (high surface temp) and dim (low brightness) because they are small remnants of stars, with high temperature from residual heat but low luminosity due to small size.

Step3: Confirm Classification

White dwarfs are in the bottom - left of the HR diagram (hot, dim). So a star like Sirius B is in quadrant 3 (or the quadrant with high temp, low brightness) and is a white dwarf.

Answer:

The quadrant containing hot, dim stars is quadrant 3. A star from this quadrant is Sirius B, and its classification is a white dwarf (or other white dwarfs like Procyon B, Van Maanen's Star; classification: white dwarf).