README web version of /home/usg/OPS/MTS/readme_xml/readme_60944400

Principal Investigator Email Address

• mvandena@eso.org

Estimated Total Execution Time (hours, including overheads)

• 1.0

General Description

• We want to obtain a long-slit spectrum from the UV to the near-IR of the
   erupting young star V1647 Ori.  The target is currently fading after an outburst
   in December 2008 and is currently expected to have a V-band magnitude of 17-19.
    However, the source has a red energy distribution, so it will be fainter than this
   in the UV and brighter in the near-IR arm. 
  
  As our target is quite red, we expect the obtained S/N in the spectrum to be a strong
   function of wavelength; we aim to get a spectrum with S/N > 10 at wavelengths
   longer than 500 nm in the optical arm.  For the near-IR arm the S/N should be better
   (~ 20), and we'll take whatever comes out of the UV arm.
  
  Acquisition can be done on the target itself; for the science observation we have
   opted for a parallactic slit angle and we nod on the slit to obtain a clean near-IR
   spectrum.

Waiver Requests

• None.

Critical Observing Condition Constraints

• Apart from decent seeing in the optical, no strong constraints on observing
   conditions.

Time-Critical Aspects

• The target is fading by a few tenths of a magnitude per month.  Therefore
   we have a slight preference to get this spectrum in the August 2009 SV run, but
   if this is not possible, September 2009 would do as well.

Special Execution Requirements

• None.

Special Calibration Information

• We expect normal calibrations (bias, flatfields, arc spectra), as well
   as a telluric standard and a spectrophotometric standard to be taken as part of
   the normal calibration plan (c.f. X-shooter manual, Sect. 4.1).  For the telluric
   standard we prefer early-type (< B4) dwarfs or giants (luminosity class III-V).

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