Re: Extinction Coefficient
Posted by
karenacollins on
May 24, 2019; 6:58am
URL: http://astroimagej.170.s1.nabble.com/Extinction-Coefficient-tp1128p1159.html
HI Marina,
That is correct.
Karen
On 5/23/2019 6:13 AM, Chatzisotiriou Marina [via AstroImageJ] wrote:
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