Re: Extinction Coefficient
Posted by
Chatzisotiriou Marina on
May 23, 2019; 10:13am
URL: http://astroimagej.170.s1.nabble.com/Extinction-Coefficient-tp1128p1158.html
Hello Karen,
Thank you for your answer! I would like to ask another one. I want to measure the counts of a star within an aperture but without the background. In order to do that I set the object aperture and around it an inner and outer background aperture and I use the value given in Source-Sky. Is this correct?
Thank you,
Marina
On "karenacollins [via AstroImageJ]" <
[hidden email]>, May 16, 2019 5:15 AM wrote:
The total ADU counts in aperture NN are given in the data column Source-Sky_TNN. I think you would need to know what absolute flux an ADU corresponds to for your telescope and camera. Alternatively, I think you would need to relate the Source-Sky_TNN counts
to counts from another star for which you know the AB magnitude. I don't have experience using the AB magnitude system, so I can't give much guidance.
Maybe someone else on the forum is able to help?
Karen