Space Telescope Science Institute
STIS Instrument Handbook
help@stsci.edu
Table of Contents Previous Next Index Print


Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 22 > Chapter 13: Spectroscopic Reference Material > 13.1 Introduction

13.1
The information in this chapter will help you select your grating configuration and observing slit and determine your observing plan (e.g., total required exposure time, and number of exposures). This chapter is basically organized by grating and slit (corresponding to Spectral Element and Aperture in the Phase II Proposal Instructions.)
For each grating mode the following are provided:
Plots of signal-to-noise as a function of V+STMAGλ (the color-dependent correction from V magnitude to STMAG at wavelength λ), Fλ, and exposure time.
For each slit the following are provided:
For representative grating-slit combinations we provide:
In addition,
Section 13.8 provides a summary of the screening brightness limits for the MAMA spectroscopic modes.
The sensitivities and dark currents adopted for calculating the figures and tables used in this chapter were projected before SM4 for a date of August 2008. Actual values for Cycle 22 will differ slightly. For the most up-to-date values, please consult the STIS ETC.
The next section explains the plots and tables found in the grating sections in this chapter.

Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 22 > Chapter 13: Spectroscopic Reference Material > 13.1 Introduction

Table of Contents Previous Next Index Print