A Cepheid star is a type of variable star, which means its brightness is not constant. The relationship between the brightness of a Cepheid star and its period, or length of its pulse, is given by M = –2.78(log P) – 1.35, where M is the absolute magnitude, or brightness, of the star, and P is the number of days required for the star to complete one cycle. What is the absolute magnitude of a star that has a period of 45 days? Use a calculator. Round your answer to the nearest hundredth. –5.95 –4.60 3.25 4.60

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oladayoademosu oladayoademosu · Answer 1 · 2020-07-22T07:52:15+02:00

Answer:

The absolute brightness of the Cepheid star after a period of 45 days is -5.95

Step-by-step explanation:

Since the absolute magnitude or brightness of a Cepheid star is related to its period or length of its pulse by

M = –2.78(log P) – 1.35 where M = absolute magnitude and P = period or length of pulse.

From our question, it is given that P = 45 days.

So, M = –2.78(log P) – 1.35

M = –2.78(log 45) – 1.35

M = –2.78(1.6532) – 1.35

M = -4.60 - 1.35

M = -5.95

So, the absolute magnitude or brightness M of a Cepheid star after a period P of 45 days is -5.95

tutorareej tutorareej · Answer 2 · 2021-12-06T13:21:44+01:00

Cepheid star is a type of variable star, which means its brightness is not constant. The answer to the above question is -5.95

Explanation to the above Question

According to the M= magnitude or brightness of the star.

P = The no of days required to the complete cycle =45.

M = –2.78(log P) – 1.35.

M = –2.78(log45) – 1.35.

M=-2.78(1.6532)-1.35

M=-5.95

Thus we conclude that the above answer to the question is -5.95.

To know more about the variable star

https://brainly.com/question/25749395