Question

1. what does the \h - r\ stand for when we talk about an h - r diagram? hertz nussel
2. describe what an h - r diagram is in your own words! a graph or statistic of stars and colors on the horizontal and vertical axis
3. what does luminosity mean? (in your own words) nice quality

part i: click on \hr diagram\ to fill out the table.
color of star groups,size of the star (small, medium, large),temperature (k),luminosity (brightness) (low, medium, high)
red,small, large,0 - 4300k,low, high
orange,medium,3500 - 5000k,medium
yellow,medium,5000 - 6000k,medium
white,small,medium,6000 - 10000k,medium,high
blue,large,10000k,high

Explanation:

1. The "H - R" in H - R Diagram stands for Hertzsprung - Russell. Ejnar Hertzsprung and Henry Norris Russell independently developed the diagram.
2. An H - R Diagram is a scatter - plot of stars showing the relationship between the stars' absolute magnitudes (luminosities) versus their spectral types (which are related to temperature). It helps in understanding stellar evolution.
3. Luminosity is the total amount of energy emitted by a star per unit time. It is a measure of the star's intrinsic brightness, not how bright it appears from Earth.

Answer:

1. Hertzsprung - Russell
2. A scatter - plot showing the relationship between stars' luminosities and spectral types to understand stellar evolution.
3. The total amount of energy emitted by a star per unit time, an intrinsic measure of its brightness.