All Questions
Tagged with extinction apparent-magnitude
5 questions
2
votes
1
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How to count observable number of galaxies at a given latitude considering interstellar extinction?
If galaxies are uniformly distributed in space, then in the absence of extinction, the number of galaxies per square degree brighter than magnitude m is given by $$\log_{N_0}(m) = 0.6m + C$$
How will ...
- 163k
8
votes
1
answer
1k
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Determining the extinction by counting stars?
Hi I'm a highschool student studying astronomy at school.
I learned that one can determine how much a luminosity of a star is reduced by counting stars, but I can't understand how it works. My ...
- 17.7k
2
votes
1
answer
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Distance to star using color index
I'm doing the following question:
A star is observed with UBV magnitudes $m_u = 16.31$, $m_b = 14.52$,
$m_v = 13.76$. Spectral analysis gives $M_{bol} = 7.31$, $BC = -1.02$, $(U − B)_0 = 1.222$. ...
- 163k
0
votes
1
answer
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Extinction and reddening dataset
Where can I find a dataset containing the interstellar reddening and extinction values for all globular clusters, preferably in the HST/WFC3 system.
- 430
2
votes
2
answers
587
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Galactic extinction as a function of distance
I am looking at several galactic sources in the $I$, $R$ and $V$ bands and I want to calculate their absolute magnitudes. I can get the apparent magnitude and I know the distance so I just need to ...
- 822