FP-SPLIT Slits 0.2X0.2FP(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 Section 12.5.2 for more details on obtaining high S/N spectral data.


Aperture

Projected Length (arcsec)

Width (arcsec)

0.2X0.2FPA

0.2

0.2

0.2X0.2FPB

0.2

0.2

0.2X0.2FPC

0.2

0.2

0.2X0.2FPD

0.2

0.2

0.2X0.2FPE

0.2

0.2

Figure 13.78: 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 13.30: Throughput for 0.2X0.2FP(A–E).

λ


 

% Throughput

0.2X0.2FPA

0.2X0.2FPB

0.2X0.2FPC

0.2X0.2FPD

0.2X0.2FPE

1200

54.7

54.8

54.7

55.0

55.1

1800

67.4

67.5

67.4

67.6

67.7

2400

73.9

73.9

73.9

74.0

74.1

3000

77.3

77.3

77.3

77.3

77.4

3600

79.7

79.7

79.7

79.7

79.8

4200

81.7

81.7

81.7

81.7

81.7

4800

82.7

82.7

82.7

82.7

82.8

5400

83.3

83.4

83.3

83.4

83.5

6000

82.0

82.2

82.0

82.2

82.5

Figure 13.79: 0.2X0.2FP(A-E) Aperture Throughput as a Function of Wavelength.