2.5 Astro 1 - Astro 1 Section 1 Professor Brandt Friday...

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Astro 1 Section 1 Professor Brandt Friday February 5th 1999 Announcements: Lecture notes: Class 12 Now we will move beyond the sun and start talking about other stars We shall see that the same basic principles we learned about for the sun apply to others stars too. For example gravity holds them together fusion powers them. However there are important differences too. We'll start with 2 relatively nearby stars in constellation Centarus Hadar and Menkent Hadar is 4.5 times brighter than Menkent. Now we learned that not all stars in a given constellation are at the same distances. You might think Hadar is closer. This is a reasonable thing to think since closer objects will tend to be brighter. Inverse square law for apparent brightness - the apparent brightness of an object depends on the inverse square of its distance twice as far away 4 times fainter 3 times as far away 9 times fainter half as far away 4 times brighter Like Newton's Law of Universal Gravitation. However it actually turns out that Hadar is further away. We can measure
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This note was uploaded on 02/20/2008 for the course ASTRO 1 taught by Professor Brandt during the Spring '99 term at Pennsylvania State University, University Park.

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2.5 Astro 1 - Astro 1 Section 1 Professor Brandt Friday...

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