Annie Aquino's Quiz

How do we measure stellar luminosities ?

-apparent brightness= luminosity
4pie x distance^2

How do we measure stellar temperatures ?

-the spectra of stars show their surface temperatures. usually ranging from more than

40,000K to less than 3000K.

How do we measure stellar masses?

-We determine the masses of stars in binary systems if we can measure both their orbital

period and separation between them

What is the hertzsprung russle diagram?

-classification method of stars luminosity and stellar surface temp.

What is the significance of the main sequence?

-main sequence stars mass determine both its luminosity and surface temp

-more massive stars have much shorter lives because they fuse hydrogen at a much

greater rate

What are giants, super giants and white dwarfs ?

-giants and super giants are stars that are nearing the ends of their lives

-white dwarfs are cooling embers of star that have exhausted their fuel

What are the two types of star clusters?

-open clusters- modest sized

-globular- densely packed

How do we measure the age of the star clusters?

-main sequence turn off

-the hydrogen core fusion lifetime of the most massive main sequence stars

remaining within it

Do we know any cluster older than 14 billion years old/ how old is our universe?

- no we do not because that is the age of our universe