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 Chapter 12 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: 0.2X0.2FP(A-E) Slit Throughputs

λ	% Throughput
1200	34.0
1800	67.2
2400	73.6
3000	77.3
3600	79.7
4200	81.6
4800	82.7
5400	83.1
6000	82.0

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