README web version of /home/usg/OPS/MTS/readme_xml/readme_83042000

Principal Investigator Email Address

• brandner@mpia.de

Estimated Total Execution Time (hours, including overheads)

• 4

General Description

• The Arches cluster shall be observed with the SINFONIE IFU in the H+K
   grism.
  The present-day mass function of the cluster is irregular for stars below
  12 Msun, K > 15.5 mag. The spectroscopy shall be used to derive the MF from
  spectrally classified stars in the critical regime and probe the irregularities.
  The cluster is heavily embedded and most objects on the field are red (H-K~2).
  
  The guide star is provided by a less reddened foreground star. Fields are selected
  to cover the largest number of primary targets (15 < K <17.7). The RA/DEC
  positions of the guide star and each field are derived from the same NACO
  image, and relative positions from the GS to each field are confirmed
  from the same image.
  
  Guide star: GSC2 ID: S222122222425  (same for all fields!)
  GSC2 RA: 17:45:49.783   DEC: -28:49:22.39
  GSC2 R-mag 15.31        colour R-B_J=2.96 mag
  
  NACO RA: 17:45:49.782   DEC: -28:49:22.39
  NACO K=10.6 mag         H=12.4 mag
  
  The NACO RA/DEC provide the reference coordinates for the target fields.
  
  Object/Field   RA          DEC       K-mag    separ.  offset GS -> Field
                NACO         NACO       max      NGS["]   RA["] DEC["]
  ----------------------------------------------------------------------------------
  Arches F7  17:45:49.997 -28:49:27.78  12.0      6.07   +2.78  -5.39
  Arches F8  17:45:49.725 -28:49:19.76  12.6      2.74   -0.75  +2.63
  
  
  All offsets are given in arcseconds, as offset when moving from the NGS
  to the field. The same NGS is used for all fields.
  
  A nearby, dark sky position without foreground stars is selected to avoid
  contamination from the dense Galactic Center population.
  
  Many thanks for your support! :-)

Waiver Requests

• 083.D-0420A.01.WAV: waiver request to admit OBs slightly longer than 1
   hr

Critical Observing Condition Constraints

• To the best of our knowledge after extensive ETC simulations, we have
   derived
  DITs of 150s, which should never saturate in the H or K-band regime at K=12.0 mag
  and H=12.4 mag, the brightest star in all fields. Please make sure that
  saturation under real observing conditions does indeed not occur in this setup.

Time-Critical Aspects

• No time critical aspects.

Special Execution Requirements

• This project aims at depth, not area coverage. Please finish the OBs on
   one field
  before starting the next when conditions allow.

Special Calibration Information

• Please use
  
  G2/3V
  
  stars for telluric calibration whenever possible. Telluric standards
  should be obtained as stated in the calibration plan (one per observation),
  but at least every 2-3 hours at the same airmass as the target.
  Hot stars may interfere with features in the hot stars we intend to calibrate,
  so G2V stars are clearly preferable.
  
  Note that we have not submitted telluric standard OBs, as we - in contrast
  to the observing team - are not familiar with SINFONI standard star
  brightness and required intergration times. We have, however, checked
  for G2/3V stars available close to our target fields, e.g.
  
  NIRI 17:46:06.24 -32:24:13.6  V=9.38 (K~11,G3V)
  NIRI 17:54:18.37 -25:57:43.7  V=9.00 (G2V/G1V)
  
  but those may be too bright as SINFONIE telluric standards?

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

Source(s) of Pre-imaging

• ---(Empty)---

Pre-imaging sources not listed above

• ---(Empty)---

Do all your OBs comply with the instrument-specific requirements listed
 on the instrument-specific Phase 2 web page ?

• YES

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing
 Category for each Observing Template ?

• N/A

Do all your finding charts comply with both the general and instrument-specific
 Phase 2 Web Pages ?

• YES

If you submitted OBs for standard stars, did you specify the magnitude
 and spectral type of all standard stars in the OBs ?

• N/A

Have you included OBs for any calibrations that you need but which are
 not part of the Calibration Plan ?

• N/A

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If you have preferences which OBs should be executed first, did you make
 use of the User Priority field in the OBs ?

• YES

If this is a run that requires coordinated observations with other facilities,
 did you give proper instructions in the Time-Critical Aspects Section ?

• N/A

Did you indicate the magnitude of the brightest object in the field in
 each SINFONI OB?

• YES

If you are using the AO: Did you indicate for every OB the magnitude
 of the guide star, and its distance to the target (if any)?

• YES

If you submitted OBs for standard stars, did you use the provided StandardStar
 templates?

• N/A

If you are using a specific offset pattern or position angle: did you
 check carefully the definition in the manual?

• N/A

Did you make really sure that none of your OBs ever saturates the detector?

• YES

If you are using the AO: did you enter the correct Strehl Ratio (on-axis,
 K-band) AND the seeing value in the constraint set?

• YES