what are some physical properties of stars

http://www.ucolick.org/~bolte/AY4_00/week4/star_propertiesC.html

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Some of the physical properties of stars include:

1. Size: Stars come in various sizes, ranging from smaller than Earth (white dwarfs) to giants hundreds of times larger than our Sun (red supergiants).

2. Mass: The mass of a star determines its lifespan, energy production, and eventual fate. Stars can have masses ranging from a fraction of the Sun's mass to tens or even hundreds of times the Sun's mass.

3. Temperature: Stars can be extremely hot, with temperatures reaching millions of degrees Celsius at their cores. The surface temperature of a star determines its color, from cool red stars to hot blue stars.

4. Luminosity: Luminosity refers to the total amount of energy a star emits per unit time. It is an indicator of a star's intrinsic brightness. Luminosity is closely related to a star's temperature and size.

5. Composition: Stars are primarily composed of hydrogen and helium, with trace amounts of other elements. The exact composition can vary depending on the age and type of star.

6. Spectral Type: Stars can be categorized into different spectral types based on the features observed in their spectra. The spectral type provides information about the star's temperature, luminosity, and chemical composition.

These properties can be determined through various methods, including spectroscopy, which analyzes the star's light to reveal information about its composition and temperature. Additionally, observing a star's brightness variations, motion, and gravitational effects on nearby objects can yield valuable information about its mass and size.