Question

pre - practice (use google): 1. what does the \h - r\ stand for when we talk about an h - r diagram? 2. describe what an h - r diagram is in your own words! 3. what does luminosity mean? (in your own words) part 1: click on \hr diagram\ to fill out the table.

Explanation:

1. The "H - R" in an H - R Diagram stands for Hertzsprung - Russell. It is a graphical tool used in astronomy to classify stars based on their luminosity and temperature (or spectral type).
2. An H - R Diagram is a scatter - plot of stars showing the relationship between a star's luminosity (absolute magnitude) on the vertical axis and its spectral type (related to surface temperature) on the horizontal axis. It helps astronomers understand stellar evolution.
3. Luminosity is a measure of the total amount of energy a star radiates per second. It is an intrinsic property of the star and is not the same as apparent brightness which depends on the star's distance from us.

Answer:

1. "H - R" stands for Hertzsprung - Russell.
2. An H - R Diagram is a scatter - plot with luminosity on the vertical axis and spectral type (related to temperature) on the horizontal axis, used to study stellar evolution.
3. Luminosity is the total energy a star radiates per second.