DEIMOS user script observe_flux

Name

observe_flux_standard -- acquire spectra for monthly DEIMOS throughput test

Purpose

Take a series of exposures required for the DEIMOS monthly
throughput check using the current grating.

Usage

observe_flux_standard [-q | -v ]

Arguments

-q = query mode (ask before running)
-v = verify the telescope setup (starname, pa, instrument) and
do not execute data acquisiition and instr and tel moves.

Procedure

- verifies that the telescope is pointed to a known DEIMOS
flux standard star by checking DCS keyword TARGNAME
- check the current grating and build appropriate exposure list
- save current DEIMOS configuration
- check that SKYPA is correct for this star
- set pointing origin to SLIT
- configure for slitless spectroscopy
- acquire exposures
- restore configuration

Restrictions

- before starting the script, you must set the SKYPA to the
correct value for the star you plan to observe. See the following
table
- a grating must be in place when the script is started

Valid targets

Starname PA RA Dec Equinox
-------- -- ------------ ------------ -------
G191B2B 0 05:05:30.600 +52:49:54.00 2000.0
Feige34 90 10:39:36.700 +43:06:10.00 2000.0
HZ44 90 13:23:35.400 +36:08:00.00 2000.0
BD+33 2642 0 15:51:59.9 +32:56:55 2000
BD+28 4211 90 21:51:11.100 +28:51:52.00 2000.0
Feige110 90 23:19:58.400 -05:09:56.00 2000.0

Note: This information is in starlist
/kroot/starlists/0000_Throughput_standards.list

Exit values

0 = normal completion
1 = wrong number of arguments
2 = current star is not a valid DEIMOS flux standard
3 = no exposures defined for current grating
4 = number of filters and wavelengths don't match
5 = SKYPA is wrong

Note

SKYPA must currently be set manually prior to running the script,
since it is not possible currently to ensure that it can be set
automatically to a value not near the limits.

Example

1) To acquire exposures on the star G191B2B with the 1200G grating:
- point the telescope to G191B2B (any pointing origin)
- set the SKYPA to the 0 deg (see table above)
- move the 1200G grating into position
- execute the command:
observe_flux_standard
Assuming that the GG400, GG455, and OG550 filters are installed,
the script will acquire 3 60s exposures:
1200G/5000A + GG400
1200G/7000A + GG455
1200G/8000A + OG550