README web version of /home/usg/OPS/MTS/readme_xml/readme_79064600

Principal Investigator Email Address

• leyder@astro.ulg.ac.be

Estimated Total Execution Time (hours, including overheads)

• 10:00:00.000

General Description

• We propose to perform a spectroscopic investigation of the Wolf-Rayet
   (WR) star WR 115.
  
  We will use the following wavelength settings for our target :
  - lambda = 4058 A, to measure the radial velocity (RV) of the rather narrow N IV
   4058 emission line which is usually considered as the best indicator of the true
   radial velocity of WN stars (OBs named "4058A"); and
  - lambda = 4506 A, to detect and measure the He I 4471 and He II 4542 absorption
   lines of the O star companion; the radial velocities of these lines will provide
   the radial velocity of the O-star, while their equivalent widths will allow to derive
   its spectral type (OBs named "4506A").
  
  Since we ignore the orbital period of the system, we adopt the following strategy
   that should allow us to probe a rather wide range of time-scales and hence to determine
   the orbital period : we would like to observe the star on 3 closely spaced nights
   (OBs named "Night n"), as well as on 7 other nights spread throughout P79 (i.e.
   roughly once per month; OBs named "Month n").
  
  Note : it is not mandatory to observe the star in both spectral domains on the same
   nights.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None.

Time-Critical Aspects

• Since we ignore the orbital period but aim at determining it, our goal
   is to span a range of time-scales as large as possible. Therefore, our observation
   strategy is to obtain (for both spectral domains) 3 observations on closely spaced
   nights (OBs named "Night n"), and 7 observations spread over the observing period
   P79 (OBs named "Month n").
  
  Note that to simplify the scheduling of the observations, it is not necessary to
   carry out both spectral domain observations on the same nights.

Special Execution Requirements

• None.

Special Calibration Information

• We need a standard wavelength calibration to be executed just after (or
   before) each observation.
  
  Moreover, we need 10 standard bias and 10 standard flats to be obtained during day-time
   (either before the night, or in the morning); they are named as the corresponding
   OB followed by "Day" to indicate that these are day-time calibrations.

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 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