README web version of /home/usg/OPS/MTS/readme_xml/readme_60941000

Principal Investigator Email Address

• fkerber@eso.org

Estimated Total Execution Time (hours, including overheads)

• 17m 40s

General Description

• HD122750 is a main sequence (MS) star that forms a co-moving proper
  motion pair with a white dwarf (ZZ Cet type). The goal of this proposal is to
  obtain high quality spectra in order to perform a detailed spectral analysis
  of the MS star which so far has only been observed with objective prism
  spectroscopy. If physical binarity can be confirmed this will be the first
  pair between a ZZ Cet pulsating WD and a MS star. Based on the reliable MS
  distance it will be possible to stringently test models of WD structure and
  evolution using this binary as a laboratory.
  
  The observations should be conducted with X-shooter in the following set-up:
  
  - most narrow slit: UVB/VIS/NIR: 0.5/0.4/0.4 arcsec
  - slit at parallactic angle
  - CCD readout: gain high, 2x1 spatial binning, slow
  - texp 10sec for UVB, VIS, NIR, DIT 1s, NDIT 10
  - Nexp= 5
  
  The exposure times have been estimated using the ETC and an appropriate
  blackbody. Since the target is so bright it can be observed in bad seeing as
  well as in THN conditions. Since the predictions of the ETC are not
  fully validated yet, it will be important to check the actual exposure level
  and to avoid saturation in particular in good seeing. The goal is to get a
  S/N of >100 in an individual exposure and to obtain 5 exposures. In very bad
  seeing the exposure time should be increased accordingly.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None

Time-Critical Aspects

• None

Special Execution Requirements

• The exposure times have been estimated using the ETC and an appropriate
  blackbody. Since the target is so bright it can be observed in bad seeing as
  well as in THN conditions. Since the predictions of the ETC are not
  fully validated yet, it will be important to check the actual exposure level
  and to avoid saturation in particular in good seeing. The goal is to get a
  S/N of >100 in an individual exposure and to obtain 5 exposures. In very bad
  seeing the exposure time should be increased accordingly.

Special Calibration Information

• None

ToO Information

• N/A

ToO Activators List

• N/A

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