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Instrument Science Report STIS 96-009A

STIS Mode Select Mechanism Grating Positions (Revision A)
Mark Clampin and Stefi Baum July 30, 1996

ABSTRACT We summarize the central wavelengths corresponding to each of the defined STIS grating positions.

1. Introduction
The Space Telescope Imaging Spectrograph (STIS) has a diverse set of observing configurations which are selected via the Mode Select Mechanism (MSM), a nutating grating wheel. For observing configurations where the spectral format is larger than the detector, the gratings must be scanned across the detector in successive steps. A complement of Prime and Intermediate grating settings have been defined in this report to support spectroscopic observations with each of the STIS gratings. In Table 1 below, we present central wavelengths for each STIS grating. In cases where the grating can be scanned, a series of prime and intermediate central wavelengths are listed. The prime wavelength settings correspond to grating scan angles which give continous spectral coverage with ~10% overlap. The intermediate grating settings have been defined for scanned gratings modes to place lines of astrophysical interest at the center of the detector. The positions have been designed to incorporate the optimum number of diagnostic lines in each of the spectral ranges. The MSM grating positions defined in this ISR are the set that will be available for use by GOs and GTOs in Cycle 7. A preliminary description of the STIS science team's selection of the central wavelengths for each observing mode was given in SER CAL-016 and SER CAL-024. In this revision to ISR-009, we primarily incorporate changes to the list published in the STIS Instrument Handbook and changes in grating settings proposed by the STIS P.I., Bruce Woodgate, which have resulted from STIS test and alignment activities at Ball Aerospace.

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Table 1. MSM central wavelength table.

Central

Type

Comment

G750L
7751 8975 prime prime centered covers longest wavelengths

G750M
5734 6094 prime intermediate NaD (5889 å, 5895å), HeI (5876, å), TiO (5939-5995 å),[FeVII], [CaV] (6086 å), TiO2 (6192-6273), [OI] (6300 å, 6364 å), [SIII] (6300 å, 6312 å), [FeX] (6374 å)

6252 6581

prime intermediate [OI] (6300 å, 6364 å), [SIII] (6300 å, 6312 å), [FeX] (6374 å), [NII] (6549 å, 6583 å), HI (6563 å), HeI (6678 å), [SII] (6717 å, 6731 å).

6768 7283 7795 8311 8561 8825 9286 9336 9806 9851 10363

prime prime prime prime intermediate prime intermediate prime intermediate prime prime HI (9545 å,10049 å), [SIII] (9532 å), CIII (9710 å), NaI (9961 å) HI (9014 å, 9229 å, 9545 å), [SIII] (9069 å,9532 å), CN (91609300å) OI (8446 å), CaII (8475-8570 å, 8630-8690 å), HI (8665 å, 8750 å, 8862 å, 9014 å), CH4 (8922 å)

G430L
4300 prime

G430M
3165 3305 3423 3680 prime intermediate prime prime HeI (3188 å), HeII (3203 å), OIII (3299 å, 3341 å, 3429 å, 3444 å), [NeIII] (3343 å), [NeV] (3346 å,3426 å), OIV (3412 å)

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Central 3843

Type intermediate

Comment HI (3704 å,3734 å, 3750 å, 3771 å, 3798 å, 3835 å, 3889 å, 3970 å), [SIII] (3722 å), [OII] (3727 å,3729 å), OIII (3760 å), HeI (3820 å, 3965 å), [NeIII] (3869 å, 3968 å), CaII H&K

3936 4194 4451 4706 4781

prime prime prime prime intermediate NIII (4641 å), CIII (4647 å), CIV (4658 å), [FeIII] (4658 å), HeII (4686 å), [ArIV] (4711 å,4740 å), HeI (4711 å), [NeIV] (4724 å, 4726 å), HI (4861 å)

4961 5093 5216 5471

prime intermediate prime prime [O III] (4959 å,5007 å)+ stellar lines

G230LB
2375 prime

G230MB
1713 1854 1995 2135 2276 2416 2557 2697 2794 prime prime prime prime prime prime prime prime intermediate HeI (2732 å, 2763 å), HeII (2734 å), [ArV], [MgV] (2786 å), MgII (2796 å, 2799 å, 2804 å), HeI (2829 å), CII, OIII (2837 å), MgI (2852 å), [ArIV] (2855 å, 2869 å)

2836 2976 3115

prime prime prime

G230L
2376 prime

G230M

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Central 1687 1769 1851 1884 1933 2014 2095 2176 2257 2338 2419 2499 2579 2600 2659 2739 2800 2818 2828 2898 2977 3055

Type prime prime prime intermediate prime prime prime prime prime prime prime prime prime intermediate prime prime intermediate prime intermediate prime prime prime

Comment

AlIII (1858 å ,1897 å), [CIII] (1909 å)

FeII (2600 å), MnII, [MgVII] (2632 å)

MgII (2796 å, 2799 å, 2804 å)

[ArV], [MgV] (2786 å), MgII (2796 å, 2799 å, 2804 å), HeI (2829 å), CII, OIII (2837 å), MgI (2852 å) [ArIV] (2855 å, 2869 å)

G140L
1425 1575 prime intermediate Required for Krypton lamp flat fielding

G140M
1173 1218 prime intermediate SiII (1194 å, 1201 å), SiIII (1207 å), HI (1216 å), OV (1218 å), NV (1238 å, 1242 å)

1222 1272 1321

prime prime prime

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Central 1371 1387 1400 1420 1470 1518 1540 1550 1567 1616 1640 1665 1714

Type prime intermediate intermediate prime prime prime intermediate intermediate prime prime intermediate prime prime

Comment

OV (1371 å), SiIV (1392 å, 1403 å), SiIII (1412 å), OIV (1402 å, 1405 å, 1406 å, 1410 å, 1413 å)

Hutchings centered CIV centered, SiII (1525 å, 1533 å), CIV (1549 å, 1551 å), [NeV] (1575 å)

He II (centered)

E230M
1978 2124 2269 2415 2561 2707 prime intermediate intermediate intermediate intermediate prime

E230H
1763 1813 1863 1913 1963 2013 2063 2113 2163 2213 prime intermediate intermediate intermediate intermediate prime intermediate intermediate intermediate intermediate

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Central 2263 2313 2363 2413 2463 2513 2563 2613 2663 2713 2762 2812 2862 2912 2962 3012

Type prime intermediate intermediate intermediate intermediate prime intermediate intermediate intermediate intermediate prime intermediate intermediate intermediate intermediate prime

Comment

E140M
1425 prime

E140H
1234 1271 1307 1343 1380 1416 1453 1489 1526 1562 1598 prime intermediate intermediate intermediate intermediate prime intermediate intermediate intermediate intermediate prime

PRISM
2125 prime

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Central 1200

Type prime

Comment far-uv tail

X140M
1425 prime

X140H
1232 1269 1305 1341 1378 1414 1451 1487 1523 1560 1587 prime intermediate intermediate intermediate intermediate prime intermediate intermediate intermediate intermediate prime

X230M
1975 2703 prime prime

X230H
1760 2010 2261 2511 2760 3010 prime prime prime prime prime prime

2. Revision History
In this revision of ISR009, the MSM grating position list has been updated to reflect the final central wavelength list published in the STIS Handbook, June 1996. In addition, several changes made by the STIS Science Team since publication of the STIS Instrument Handbook have also been included.

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The G230M central wavelength 3134 å and the G750M central wavelength 10871 å have been deleted. The MSM position 10871 å was outside the allowable MSM scan range, and the central wavelength 3134 å was removed because it had no astrophysical applications. A new position for G140L, 1575 å has been added to move the position of the Kypton lamp continuum onto the detector.

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