Solving Extinction and Reddening in Photometric Analysis of M5 Globular Cluster

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The discussion focuses on a photometric analysis of the M5 globular cluster, highlighting issues with extinction and reddening affecting the color-magnitude diagram (CMD). The user seeks to calculate the E(B-V) value to correct the CMD and accurately determine the distance using the luminosity of the RGB tip. Recommendations include checking the NASA Extragalactic Database (NED) for extinction values specific to M5, which can aid in the analysis. The user expresses gratitude for the guidance received, indicating that the information will assist in completing their work. Accurate extinction calculations are essential for reliable photometric results in astronomical studies.
taylrl2
I am currently writing up a photometric analysis of globular cluster M5 which I am doing from a set of images i have taken in the B,V and R bands. The CMD i have produced is obviously too red and faint due to the effects of extinction and reddening. As I am trying to calculate a distance using the luminosity of the tip of the RGB this effect is quite crucial. I know its E(B-V) that i need to calculate but i can't for the life of me think how to do it, any ideas? Thanks
 
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It sounds like an instrument problem to me. Have you taken another set of images?
 
The NASA Extragalactic Database (NED) gives extinction values in the direction of objects. For M5, scroll down the page http://nedwww.ipac.caltech.edu/cgi-...v_breaker=30000.0&list_limit=5&img_stamp=YES" and you'll find the extinction values for a number of passbands. Please read the notes and accompanying papers to ensure the numbers are appropriate for what you're trying to do.
 
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Thanks, the NED looks like its got just what I need. Brilliant now I can get this typed up. Thanks once again uve made my week!
 

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