README web version of /home/usg/OPS/MTS/readme_xml/readme_82505200

Principal Investigator Email Address

• gosset@astro.ulg.ac.be

Estimated Total Execution Time (hours, including overheads)

• 5

General Description

• The star (WR25) we want to monitor is a massive WR+O binary with a period
   of 208 days. We already have a nice radial velocity curve except we have a gap at
   the moment of the maximum separation in velocities (which is crucial for the orbital
   solution determination). The aim of this DDT time is to cover the fast radial velocity
   variations that occur between the 19 of March and the 29 of March. One spectrum
   every two day would be sufficient. With the science exposure, a wavelength calibration
   is necessary. The exposure time is 1800 sec + 15 sec for wavelength calibration
   + overheads. This amounts to about 3/4 hour. We designed 6 OBs to cover the 5 hours
   that have been granted. A uniform repartition of the six exposures among the dates
   19 to 29 would be the best approach. The six OBs are perfectly identical. They are
   labelled EGWRDDT 1 to 6. It would be nice to have about two measurements taken during
   the run of Evans et al.. In order to not interfere with this run, we suggest to
   observe during the evening twilight (when no SM slot is present).

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• For the nights 19-21-23, a visitor mode run is present. Therefore, for
   these nights, we suggest to observe WR25 during the evening twilight, just before
   the night, in order to minimize the impact on the visiting mode run. For dates later
   than 25, night observations are possible and thus requested. Please do not hesitate
   to contact me in case of doubt (gosset@astro.ulg.ac.be).

Time-Critical Aspects

• The aim is to monitor the radial velocity variations of WR25 in the period
   19 March to 29 March. The ideal cover would be to observe on the nights 19-21-23-25-27-29.
   However, the first nights in the list do not correspond to SM time. However it would
   be nice if you could anyway observe at these dates: the star can be observed during
   the evening twilight. It is well positioned and bright enough.

Special Execution Requirements

• The aim is to measure a radial velocity. Therefore, a wavelength calibration
   should be acquired just after the science exposure. We have made the OB "calwave"
   for this purpose.

Special Calibration Information

• The observed object is very blue. Usually, the default flats taken in
   the framework of the calibration plan are slightly deficient in the far blue (3800-4100).
   Therefore, we have difficulties to extract the blue orders due to the bad nature
   of the flat. Therefore, it would be useful to have one or a few flats well-exposed
   in the blue. This could lead to slight saturation in the red. These flats could
   be acquired at any moment during the day.

ToO Information

• N/A

ToO Activators List

• N/A

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• None

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 ?

• YES

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

Did you set 'New Preset' flag in all acquisition templates to 'True'?

• YES

If you use any lamp, did you check that it should never be left on at
 the end of any OB?

• YES