README web version of /home/usg/OPS/MTS/readme_xml/readme_78084102

Principal Investigator Email Address

• suz@ast.cam.ac.uk

Estimated Total Execution Time (hours, including overheads)

• 4.5

General Description

• The goal of the programme is to investigate accretion and binarity in
   young low mass stars with known rotation periods belonging to the Orion Nebula Cluster.
   For this purpose, we will take multi-epoch spectra in each of 2 settings and 2 FLAMES+GIRAFFE
   configurations. This means we have 4 science OBs per epoch, and a total of ~240
   objects. 
  
  NB: Although we initially planned to use the simultaneous GIRAFFE and UVES mode,
   we have opted to use GIRAFFE only in the end, because there was no gain in observing
   our highest priority targets with UVES.
  
  We plan to obtain 4 epochs during 4 consecutive half-nights in visitor mode (Run
   A) plus two additional epochs in service mode (runs B and C) to extend the time
   coverage. Runs B and C should be scheduled after run A, by roughly one week and
   one month respectively. This is run C, to be carried out roughly one month after
   run A. 
  
  The two settings are: 
  - one containing Halpha and the Lithium I line at 670.7nm (GIRAFFE h665.0). The
   primary purpose of observations in this setting is to monitor accretion using the
   profile of the Halpha line and measure radial and rotational velocities.
  - one centred on the Calcium II Infrared triplet around 850nm (GIRAFFE h875.7).
   The primary purpose of observations in this setting is to measure radial velocities
   and monitor activity using the Ca IRT lines.
  
  In each configuration, we have allocated ~80% of the Medusa fibres to ONC members
   with published photometric rotation periods, ~20% to ONC members without photometric
   rotation periods (control sample) and ~12 to sky positions. In addition, we allocated
   5 or 6 UVES fibres to particularly interesting bright ONC objects plus 1 or 2 to
   sky, with the last fibre for the ThAr calibration lamp in the bluer setting and
   sky in the redder setting. A small number of faint objects (~4) are included in
   both configurations to accumulate better signal to noise and act as a control sample.
  
  This run consists of 4 OBs - one in each setting for each FLAMES configuration.
    We have allocated priority 1 to the red setting OBs and 2 to the blue setting OBs
   because it is marginally more important for us that the red setting OBs be completed,
   though of course all OBs are important. 
  
  Each blue(h665.0) OB consists of the following sequence:
  - acquisistion
  - 1 science exposure (1015s) with the calibration lamp OFF
  - 1 short exposure (60s) with the calibration lamp ON
  - 2 science exposures (1015s each) with the calibration lamp OFF
  Each red (h875.7) OB consists of the following sequence
  - acquisition
  - 3 science exposures (1000s each) with the calibration lamp OFF
  
  Note on the finding charts:
  
  - Background image: 33'x33' sloan i mosaic obtained with the Wide Field Camera on
   the Isaac Newton Telescope. 
  - Black plus sign: field centre
  - Black box: 25'x25' region centred on the field centre. Note that although the
   black box goes off the background image in configuration 2, all the targets are
   within the image (and the finding chart)
  - Red diamond: instrument guide star
  - Red squares: fiducial stars
  - Blue circles: Medusa targets
  - Green circles: Medusa sky fibres
  NB: The finding charts need to be printed at full resolution to be readable. Even
   so, some of the target sources don't show up well (there is so much dynamic range
   in the ONC it's difficult to make a good finding chart). Note that the apparent
   offsets between the fibre positions and the sources seem to be an artefact of skycat/ds9.
   We have checked our astrometry against 2MASS and find it to be consistent at the
   0.06" level.

Waiver Requests

• We requested a waiver to allow OBs longer than 1h and it was approved,
   allowing OBs of up to 70 min.
  
  In addition, although science exposures are performed with the ThAr lamp OFF, each
   blue (h665) OB contains 1 short exposure with the calibration lamp ON. I submitted
   a waiver request for this, and didn't get a formal reply but I did get am email
   from Francesca Primas confirming it was OK.

Critical Observing Condition Constraints

• Seeing better than 0.8" and clear conditions are required to ensure the
   required S/N is achieved in the exposure times specified.
  
  No lunar phase constraints, but the moon should be well separated from target (>30
   degrees).
  
  Observations should be taken at airmass < 1.6.

Time-Critical Aspects

• he OBs in this run should be carried out approximately one month after
   run A, although the exact interval between runs A and B is not critical. To reflect
   this, I selected for all the OBs in the run a time interval running from a few weeks
   after the end of run A to the end of the semester.

Special Execution Requirements

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Special Calibration Information

• Accurate wavelength calibration is critical to our programme, but the
   having the calibration lamp ON during science exposures would lead to contamination
   of the target spectra by strong Argon lines redward of 650nm. We have therefore
   set the calibration lamp to OFF during the science exposures but included a short
   (60s) exposure with the calibration lamp ON in each blue (h665.0) OB.
  
  Accurate defringing is also very important, but we decided not to request attached
   flat field as they are too time consuming. We hope the stability of the instrument
   is sufficient to ensure accurate enough defringing is possible with daytime calibrations.
   
  
  We will carry out all the standard star observations we need during run A, so no
   standard star OBs have been submited as part of this run.

ToO Information

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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 ?

• YES

Did you specify in your OBs the hour angle range for which your Target
 Setup files are valid ?

• YES

Did you specify in your OBs the magnitudes of FACBs and Guide Star for
 all your fields ?

• YES

Are the FACBs and Guide Star in the brightness ranges specified in the
 FLAMES manual ?

• YES

Did you enter the expected signal to noise in your OBs ?

• YES