Characteristic of Stars Constellation – an imaginary pattern of stars in the sky. Astronomers classify stars according to their physical characteristi Color Temperature Size Composition Brightness Color and temperature: Cooler stars (3!""oC# appear reddish $ Betelguese %edium stars (&&""oC# appear yello' – our sun ottest stars (o)er !""""oC# are *lue – +igel (see picture *elo': Blue stars hottest +ed stars coolest#
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Characteristic of StarsConstellation an imaginary pattern of stars in the sky.
Astronomers classify stars according to their physical characteristics:ColorTemperatureSizeCompositionBrightnessColor and temperature:Cooler stars (3,200oC) appear reddish - BetelgueseMedium stars (5,500oC) appear yellow our sunHottest stars (over 20,000oC) are blue Rigel(see picture below: Blue stars hottest , Red stars coolest)
Size:Small stars are called white dwarfsLarge stars are called red giant or supergiant
Brightness:The brightness of a star depends on its size and temperature.Apparent brightness the brightness of a star as seen from Earth.Absolute brightness- an astronomer must find out both the stars apparent brightness and its distance from Earth.Hertzsprung-Russell Diagram (H-R diagram) a graph that relates the surface temperatures and absolute brightness of stars.
Parallax the apparent change in position of an object when seen from different places.
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