알골 vs 폴라리스

Property 알골 폴라리스
명칭 26Bet Per 1Alp UMi
별자리 Perseus N/A
분광형 Class B — B-type (Blue-White) Class F — F-type (Yellow-White)
겉보기 등급 +2.09 +1.97
절대 등급 -0.11 -3.64
거리 89.9 ly 433 ly
질량 N/A N/A
반지름 N/A N/A
온도 N/A N/A
광도 N/A N/A

Key Differences

  • ◆ Both are variable stars, but of different physical types.
  • ◆ Polaris is a Cepheid variable that pulsates in radius; Algol dims because a companion eclipses it.
  • ◆ Polaris's pulsation amplitude has been decreasing over the past century.
  • ◆ Algol varies every 2.87 days (eclipsing); Polaris has a period of about 3.97 days (pulsation).
  • ◆ Polaris is near the north celestial pole and vital for navigation; Algol is in Perseus and known as the Demon Star.

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