FP-SPLIT Slits 0.2X0.06FP(A-E) Apertures

Description

The FP-SPLIT slits consist of two sets of five slits; in each set the slits are all the same size. They are for use with the MAMA echelle gratings. It is possible to achieve high S/N data for bright targets, independently of the quality of the flat-field, by means of a special observing strategy wherein multiple spectrograms are obtained through these slits.

Special Considerations

See Chapter 12 for more details on obtaining high S/N spectral data. Observations with this slit require a prior PEAKUP.


Aperture

Projected Length (arcsec)

Width (arcsec)

0.2X0.06FPA

0.2

0.06

0.2X0.06FPB

0.2

0.06

0.2X0.06FPC

0.2

0.06

0.2X0.06FPD

0.2

0.06

0.2X0.06FPE

0.2

0.06

Figure 13.76: Schematic of the STIS Fixed-Pattern Slit Configuration.


AXIS1 corresponds to the dispersion direction, and AXIS2 to the spatial direction. Dimensions are not to scale.

FP-SPLIT Throughputs


Table 13.29: Throughput for 0.2X0.06FP(A–E).

λ

% Throughput

1200

38.1

1800

54.1

2400

60.9

3000

63.1

3600

63.8

4200

63.7

4800

62.5

5400

60.7

6000

58.0

Figure 13.77: 0.2X0.06FP(A-E) Aperture Throughput as a Function of Wavelength.