README web version of /home/usg/OPS/MTS/readme_xml/readme_81003200

Principal Investigator Email Address

• guenther@tls-tautenburg.de

Estimated Total Execution Time (hours, including overheads)

• 10.0

General Description

• The aim of the project is to take high-precision RV-measurements using
   the N2O cell. The strategy thus is similar to observations with UVES and 
  the iodine cell in the optical. For every star, a spectrum without the cell is required
   (template), and as many spectra with the cell as possible
  (RV-measurements). In the case of TWA7 and TWAHya spectra with the cell can be taken
   in consecutive nights, whereas for HD70573 the minimum separation
  of two spectra taken with the cell is a week.
  
  It would also be helpful if the star is always acquired at the (about) same position
   on the detector (along the slit), 
  this would help to improve the RV-accuracy.
  
  Please note that TWA7 and TWAHya are close together in space. Thus, the telluric
   reference star for both is the same. 
  For p2pp-reasons, I had to prepare two different OBs (called CAL_TWA7 and CAL_TWHya)
   for this star.
  
  The expected counts per pixel are :
  HD70573 : 1000-3000 e-/pixelDIT
  TWHya   : 1000-3000 e-/pixel/DIT
  TWA7    : 1500-4000 e-/pixel/DIT
  CAL_TWA7/CAL_TWHya : 4000-10000 e-/pixel/DIT
  CAl_HD70573        : 4000-10000 e-/pixel/DIT

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Spectra can be taken under almost any observing conditions, as long as
   the AO-loop can be cosed. If that is possible at a seeing of 2.0 arcsec that would
   also be fine.

Time-Critical Aspects

• For each star ONE spectrum taken without the cell is required (template),
   which can be taken at any time
  (a good idea is to take it directly before, or after a spectrum of that star is
   taken with the cell that
  saves acquisition time).
  
  The orbital periods of the planets are:
  TWAHya : 3.56 days
  TWA7   : 5.05 days
  HD7573 : 852  days
  
  In the case of TWAHya and TWA7, the cell-spectra can be taken in consecutive nights,
   in the case of
  HD7573 it would be nice if the three spectra are spread out over months. The minimum
   useful distance
  in this case is a week. Apart from this constrain spectra can be taken at any time.

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• For this project it is required to take also flat-fields with the N2O
   absorption cell during day time. It would be nice if a spectrum of the N2O cell
   is taken (using the flat-field lamp).
  
  The expected count-rates for the stars are:
  HD70573             : 1000-3000 e-/pixel/DIT
  TWAHya              : 1000-3000 e-/pixel/DIT
  TWA7                : 1500-4000 e-/pixel/DIT
  CAL_TWA7/CAL_TWAHya : 4000-10000 e-/pixel/DIT
  CAL_HD70573         : 4000-10000 e-/pixel/DIT
  
  Because of the \"even-odd\"-effect of the ALADIN detectors, it would be very nice,
   if the flat-fields would have roughly the same count-rates.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Do the README file and the instrument comments of the telluric stars
 OBs include the required S/N/pixel of the spectrum of the telluric star, its spectral
 type and allowed spectral range?

• YES

Do any OBs include wavelength or flatfield calibrations?

• NO

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

• N/A

If the slit viewer guide star is different from the target, are the RA
 and DEC offsets accurate to within 0.05 arcsec and do they take into account the
 relative proper motion between the two objects?

• N/A

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

• YES