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One of the principal devices used in observations at the telescope Zeiss-1000 is a CCD photometer. This device was put into operation in March 1994. 46% of the observational programs of the second half of this year were fulfilled using this equipment.
The photometer was built using the standard set of astronomical image recording system based on a CCD of 530 X 580 pixels. The photometer incorporates: automatic remote control; a set of 8 filters; fast shutter that allows short exposures up to milliseconds; internal standard light sources forming a "flat field".
The system of data acquisition is realized in two versions:
The field of view of the photometer is 143 X 212". The scale in the field without the reducer is 15.27"/mm, the element size is 0.275 X 0.366".
The photometer has 5 wide-band and 3 narrow-band filters. The wide-band filters in combination with a CCD of type K585 realize the system similar to the Cousins one.
The central wavelengths of the narrow-band interference filters are designed for
the lines [OIII] 5007, H 6563,
[SII] 6734
when working in a
parallel beam, all the filters have a width at a half of maximum of about
85
.
The count rates (electron per second) for ADU = 1e- computed
throughout the
image for U = B = R = I = 20.0 for an object observed at air mass
equal to 1.0 with the given version of CCD at the telescope Zeiss-1000 are
presented in Table 1.
Band | U | B | V | R | I |
---|---|---|---|---|---|
Count rate (e-/s) | 0.18 | 10.8 | 12.4 | 15.7 | 6.0 |
Flux at the upper boundary of the atmosphere, (ph/s) | 30 | 120 | 75 | 66 | 38 |
Extinction coefficient, (magnitude/air mass) | 0.62 | 0.32 | 0.18 | 0.11 | 0.07 |
Quantum efficiency CCD+filters+telescope, (%) | 1.1 | 12.0 | 19.4 | 26.4 | 16.9 |
Zero point, A0 V, zenith e-/ADU = 1, (magnitude) | 18.14 | 22.58 | 22.73 | 22.99 | 21.95 |
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