Astronomy problem. Need help

  • Thread starter Ivan91
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  • #1
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I didnt find an astronomy subforum on the Homework section so I decided to post here.

If I have the period of a cepheid (2.5 for instance), how to find apparent and absolute magnitude ?
 

Answers and Replies

  • #2
Apparent magnitude you have to measure - the absolute magnitude you get from the period see:
http://outreach.atnf.csiro.au/education/senior/astrophysics/variable_cepheids.html [Broken]
 
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  • #3
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Ok, thanks. One more question.
What are some differences between active and normal galaxies ?
 
  • #4
davenn
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Ok, thanks. One more question.
What are some differences between active and normal galaxies ?
did you try googling... active galaxies ?

the first hit is a wikipedia link explaining the difference :)

Dave
 

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