How can I calculate the errors in using Doppler shifts for binary stars?

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Homework Help Overview

The discussion revolves around calculating errors associated with using Doppler shifts in the study of binary stars, particularly in relation to determining periods and other results. The subject area includes astrophysics and error analysis.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to understand how to calculate errors related to the speed of stars and photon dispersion. Some participants inquire about familiarity with error propagation formulas and seek clarification on calculating specific errors.

Discussion Status

Participants are exploring the topic with some guidance provided on resources for error propagation. There is an ongoing exchange of ideas regarding the definitions and calculations needed, but no consensus has been reached yet.

Contextual Notes

The original poster expresses uncertainty about the calculations involved and seeks assistance, indicating a potential gap in understanding the definitions and methods related to error analysis in this context.

stevemclaren
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hey guys,

im doing a report on binary stars, using doppler shifts to get some results for periods etc but bit unsure about how to do the errors?

i realize that the errors arise in the speed of the stars and the dispersion of the photons but how could i calculate this?

cheers for any help
x
 
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Are you familar with the ordninary error-propagation forumula?
 
yeh i know a bit about that, (dx/X)^2 and all that?
how do i calculate the error in dispersion and that tho?
x
 
http://sosnick.uchicago.edu/propagation_errors.pdf

Look at page 8, and follow that chapter.

Then you write your formula for Doppler shift as a function of frequency and speed of star. What is the definition of dispersion?
 
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