Hertzsprung-Russel Diagram: Hertzsprung-Russel Diagram also knows as HR diagram is a scatter plot of stars reflecting the relationship between luminosity and temperature or absolute magnitude vs color. Note- Larger the absolute magnitude of a star means smaller luminosity (or smaller energy it radiates). Table of various stars with color and temperature Stars Color Absolute Magnitude Adhara Bluish-white Blue 1.50 Spica Achemar -3.55 Blue -1.3 -0.52 Regulus Blue-White Sirius Blue-White Sun Yellow-White 4.8 Proxima Centauri Red 15.60 Deneb Blue-White -7 Rigel Canopus Betelgeuse Aldebaran Blue -7 Yellowish-White -5.53 Red -6 Orange -1 Mira Red 0.99 Procyon B Epsilon Eridani Bernard's Star White 11 Orange Red 6. 13 Capella Yellow-White -1 1. What is the meaning absolute magnitude of star? (Write down in few sentences)

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