Register to reply 
Orbital period of eclipsing binaries 
Share this thread: 
#1
Sep1713, 11:48 PM

P: 66

based on the data in the table I want to calculate the orbital period of the eclipsing binary but I want to state my answer in equation form so that any observer can predict the times of future eclipses. Does anyone have an idea on how I go about doing that with the given data. I tried to find a standard equation that I can essentially plug my HJDs in to express the period of eclipsing binary. Any ideas would be great. thanks pf.



#2
Sep1813, 04:44 AM

Mentor
P: 11,831

That doesn't look periodic, unless most (like >90%) eclipses are missing for some reason.
As type of the equation, you are probably looking for something like ##t=T_0 + kT## with an offset T_{0}, a period T and an integer k (numbering the eclipses). 


#3
Sep1813, 09:32 AM

P: 66

the data I was given is ment to be practice for myself so that when I am presented with the full data I will be able to process it. could you show me how to plug my HJD into the equation? what does offset mean as far as my data goes? and if T stands for period what does "t" stand for?



#4
Sep1813, 02:24 PM

P: 66

Orbital period of eclipsing binaries



#5
Sep1813, 03:09 PM

Mentor
P: 11,831

Calculate the time differences, look for something similar to a largest common divisor (not exact, but approximately).
Alternatively, try a Fourier transformation, it might give some interesting results. If a period T fits, periods T/3, T/5 and so on fit as well  there is no way to resolve that ambiguity, but T is more likely (otherwise you have a very special set of observations). 


#6
Sep1813, 10:30 PM

P: 66

I never thought to use Fourier transformation for it....though to be honest that maybe over thinking the problem....I feel that the answer is in front of me I just cant figure it out. I calculated differences in HJDs to see what was the lowest value I could get from the difference moving down the list secondary minimum to secondary minimum. I determined that the lowest orbital period I could get with doing this is 40.913HJD which was calculated by subtracting (49899.74449858.831)HJD. But I agree with you 100%. there is no way to resolve that ambiguity so im not sure how I will know that the period I calculated is the correct one, and not some multiple of the true period.



Register to reply 
Related Discussions  
Orbital period  Where does M1+M2 come from?  Astronomy & Astrophysics  8  
Orbital period  Classical Physics  2  
Orbital Period  Introductory Physics Homework  5  
Having trouble with eclipsing binaries.  Astronomy & Astrophysics  3  
Eclipsing binaries (references to data and models?)  Astronomy & Astrophysics  7 