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Дата изменения: Wed Feb 14 17:44:53 1996 Дата индексирования: Sat Dec 22 16:58:46 2007 Кодировка: Поисковые слова: южная атлантическая аномалия |
Do not forget to reduce these values by a factor of 0.3 if the focus diodes are being used for an IMAGE; this is because of the reduced area of the focus diodes compared to using eight normal diodes for an acquisition. This factor applies to when a focus diode is centered on a point source.
The flux distributions in the BPGS catalog include ultraviolet wavelengths and can be used for planning GHRS target acquisitions. Each spectrum in the catalog was dereddened and scaled to V0 = 0.0. The calcphot task in the synphot package of STSDAS was used to convolve the catalog flux distributions with the effective areas of the acquisition mirrors. Table 7.1 on page 92 contains columns giving the BPGS catalog object name, spectral type, (B-V)0, count rate for the acquisition mirror with no reddening, and scale factors (per unit magnitude) indicating the relative count rate observed at given amounts of reddening compared to the count rate with no reddening.
To use Table 7.1 on page 92