grating mode uses a low resolution grating originally designed for use with the STIS/NUV-MAMA
which has been re-directed for use with the STIS/CCD
to enable R~700 spectroscopy in the near-ultraviolet (NUV) which takes advantage of the CCD’s higher throughput and dynamic range longward of λ
grating mode is designed for programs needing the highest available sensitivity in the NUV from ~2500 to 3100 Å or more generally to allow observation of sources too bright for the MAMA in the NUV.
In making the plots for the G230LB
grating mode, we assumed that the CCD is subject to a change in the effective quantum yield resulting in the creation of multiple electron-hole pairs per photon for λ
Also be aware that because of the high sensitivity of the CCD to red light, observations of red stars with G230LB
are more likely to be affected by scatter than observations of red stars using the MAMA G230L
The top axis displays constant Fλ
values corresponding to the STMAG units (V+STMAGλ
) on the bottom axis. Recall that STMAG=0 is equivalent to Fλ
= 3.63E-9 erg/cm2
/s/Å. The curves are labeled with exposure times in seconds.