Parallax of a binary system

  • Thread starter shirin
  • Start date
  • #1
46
0

Main Question or Discussion Point

Hi
It is stated that:
"for a visual binary system, the measured trigonometric parallax is 0.3749+/-0.0057 arcsec."
I don't know this angle is parallax of what? I can guess it like this:
0.3749+0.0057 arcsec is the parallax of the whole system when they are at most distance of each other, which looks at a_1 + a_1*e + a_2 + a_2*e and,
0.3749-0.0057 arcsec is the parallax of the whole system when they are at less distance of each other, which looks at a_1 - a_1*e + a_2 - a_2*e.
Is this correct?

Thanks
 

Answers and Replies

  • #2
984
173
It's the parallax across the Earth's orbit, just like the parallaxes of isolated stars.
 
  • #3
46
0
and why is it +/-something? Is this related to error?
 
  • #4
cepheid
Staff Emeritus
Science Advisor
Gold Member
5,192
36
and why is it +/-something? Is this related to error?
Yes. It's a measurement, after all. The uncertainty is being indicated.
 
  • #5
46
0
Thank you!
 

Related Threads on Parallax of a binary system

Replies
3
Views
1K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
20
Views
4K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
14
Views
4K
  • Last Post
Replies
23
Views
2K
Replies
3
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
4
Views
2K
Top