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What are the two types of variable stars?
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Broadly they fall into two classes:
- Intrinsic variables — the star’s own luminosity changes because of physical processes (pulsation, eruptions or explosions). Examples: Cepheid and RR Lyrae (pulsating), Mira variables, novae and supernovae.
- Extrinsic variables — the apparent brightness changes for external reasons (something blocks or modulates the light). Examples: eclipsing binaries like Algol, rotating spotted stars, occultations and microlensing events.
- Intrinsic variables — the star’s own luminosity changes because of physical processes (pulsation, eruptions or explosions). Examples: Cepheid and RR Lyrae (pulsating), Mira variables, novae and supernovae.
- Extrinsic variables — the apparent brightness changes for external reasons (something blocks or modulates the light). Examples: eclipsing binaries like Algol, rotating spotted stars, occultations and microlensing events.
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