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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