Measurement

The measurement technique of the double-image micrometer works as follows: The four star images from a double star (primary A, A', secondary B, B') are placed in a configuration the regularity of which can be precisely rated (Figure 13.4).

Figure 13.4.

Configurations for measurements of distance and position angle.

Figure 13.4.

Configurations for measurements of distance and position angle.

For the distance measurements the following arrangements can be used:

- double distance (stars on a straight line);

- single distance (stars arranged in a square, for close pairs with faint components);

- single distance (stars arranged in a parallelogram, if distance is too large for double distance measurement);

- half distance (stars on a straight line).

For the position angles the calcite is rotated around the optical axis of the telescope in order to line the stars on a straight line; see the sensitive configuration: the closer B and A', the more sensitive.

Coincidences (distance measurement, single distance, stars on a straight line) are to be avoided.

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