BayTech PS-4A Guia de Resolução de Problemas descarregar pdf (Página 33)

• Turn on the flatfield projector on the telescope using the Bright lamps at maximum setting.

2. Set filename and exposure time. Use config.exposure.pl.

• Integration times of 10 – 30 s should suffice for JH- and HK-band spectroscopy.

• Take a test exposure (singleimage.pl). The counts should be < 25,000 ADU for wavelengths < 2.4 μm.

• With 30 second integration times, it is possible to do 8 reads, if you can accept the little bit of extra

overhead.

• For longslit observations, one can use the White Spot. Integration times will be shorter, 5 – 10 s.

3. Take at least 5 flats with the lamps on. Use more.single.images.pl 5.

4. Have the telescope operator turn down the flatfield lamp, or turn it off.

• Flats at two different illumination levels are differenced to remove the dark current.

5. Take at least 5 flats with the lamps off. Use more.single.images.pl 5.

FLAMINGOS@4-m, Ver. 2.39, 2013 April 23 Page 33 of 47

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BayTech PS-4A Guia de Resolução de Problemas Página 33