README web version of /home/usg/OPS/MTS/readme_xml/readme_81046600

Principal Investigator Email Address

• boris.gaensicke@warwick.ac.uk

Estimated Total Execution Time (hours, including overheads)

• 6h

General Description

• This program targets two white dwarfs which have gaseous, volatile-element
   depleted debris discs. The debris discs are unveiled double-peaked emission lines
   in the CaII 860nm triplet, and by FeII 517nm. Various metal lines in the photosphere
   of the white dwarf show that the star is accreting from the debris disc. The aim
   of these observations is to provide high-resolution data of the emission lines of
   the discs and of the absorption lines from the white dwarf. 
  
  Having received a first set of UVES data from a previous observing programme on
   one of the targets, SDSS1228+1040, we have slightly modified the strategy with respect
   to the Phase I proposal: we have dropped a third, fainter target for which the data
   would have been marginal, and decided to spend more time on the 517nm Iron lines.
   
  
  Please try to carry out the OB SDSS1228_437+760 a bit later in Period 81, preferably
   from mid-June onwards, as this will help in establishing the level of variability
   in the CaII emission lines (by comparison with our 2007 UVES data).

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None beyond the constraint sets in the OBs.

Time-Critical Aspects

• Please try to carry out the OB SDSS1228_437+760 a bit later in Period
   81, preferably from mid-June onwards, as this will help in establishing the level
   of variability in the CaII emission lines (by comparison with our 2007 UVES data).

Special Execution Requirements

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Special Calibration Information

• ---(Empty)---

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 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