README web version of /home/usg/OPS/MTS/readme_xml/readme_84028301

Principal Investigator Email Address

• lpasquin@eso.org

Estimated Total Execution Time (hours, including overheads)

• 02:59:50

General Description

• This is a short program to study He abundance spread in Globular Cllusters
   by 
  observing the He 10830 line. The line is formed in the chromosphere, but our 
  models of these stars show that it is much more sensitive to abundance variations
   
  than to variations in chromospheric activity. The A part of the proposal 
  is for the He lines, the B part (this one) to record the chromospheric Halfa and
   
  Ca II cores. The UVES observations will be used to confirm that the stars have similar
   
  chromospheric actiity and to  develop a chromospheric model to be used for the 
  interpretation of the spectra. 
  
  The stars are 4 : two brighter and two fainter. Of each couple , one is O reach,
   the other
  O poor. If the difference in Oxygen is due to a rpimordial pollution or CNO proceesed
   
  gas, then the two stars shoul dshow as well a huge difference in He abundance.
  
  FINDING CHARTS: I AM SORRY THERE IS A 1 ARCSECOND offet between objects and the
   arrows (box center). 
  The star is always the brightest object, NE of the arrow. I hope is OK.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• none

Time-Critical Aspects

• none

Special Execution Requirements

• Out of the 4 stars 2 are fainter (32685, 42886), two brighter (48889,
   46422)
  In case all OBs could not be executed, it would be important that the 
  observations of at least one PAIR was finished. If possible,
  please observe faint - faint 
  or bright-bright 
  
  NOT  faint - bright or bright - faint 
  
  Thanks

Special Calibration Information

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ToO Information

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ToO Activators List

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

• YES

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 specified the S/N ratio at given wavelength in the User Comments
 field of each OB?

• YES

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 ?

• N/A

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

If you need secondary guiding, are there suitable objects within 30 arcsec
 from your target ?

• N/A