README web version of /home/usg/OPS/MTS/readme_xml/readme_77070600

Principal Investigator Email Address

• Fabien.Malbet@obs.ujf-grenoble.fr

Estimated Total Execution Time (hours, including overheads)

• 1

General Description

• Using MIDI data obtained during Science Demonstration Time in June 2003
   on the UT1-UT3 baseline, we have built a simple model for 51 Oph and its surrounding
   disk, starting from the one developed by Malbet & Bertout (1995, A&AS 113,
   369). With this model we could explain the visibility data, the SED and also find
   an agreement with the disk inclination angle, as reported by Thi et al. (2005) (see
   Fig. 2 of our proposal). We determined a stellar diameter of 7Rsun , an inner radius
   for the disk of 0.55AU, an outer radius of 7AU, a disk inclination angle i~88deg
    and a disk position angle PA~168deg. These results were presented by Gil et al.
   (2005) at the ESO-EII workshop The Power of Optical/IR Interferometry: Recent Scientific
   Results and 2nd Generation VLTI Instrumentation, under the title  Observations of
   51 Ophiuchi with MIDI at the VLTI (astro-ph preprint 0508052). Due to the nature
   of the object, our interpretation relies critically on one visibility point. Four
   of the visibility points are nearly identical, while the fifth is significantly
   higher (left one in left panel of Fig. 2 of our proposal). Our immediate goal is
   thus to secure the data set observed in June 2003 on 51 Oph by obtaining two additional
   visibility points, which will enable us to support or falsify our current model.
   The optimal regions in the uv-plane, where the new visibilities should be obtained,
   are shown in Fig. 3 of . They corresponds to observations on the UT1-UT3 baseline
   [OB 077C.-0706(A)] and the UT2-UT4 baseline [OB 077C.-0706(B)].
  For the OB(A), it is important to obtain it with an hour angle <-1h (to get a
   point as much as possible in the left part of Fig. 2 of our proposal, while the
   second OB (B) can be done at any hour angle between [0h, 2h].

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None

Time-Critical Aspects

• For the OB(A), it is important to obtain it with an hour angle <-1h
   (to get a point as much as possible in the left part of Fig. 2 of our proposal).
   This is why we put observations between sideral time 14:31 and 16:31.

Special Execution Requirements

• see above

Special Calibration Information

• The Calibrator is not from CalVin.
  
  It was obtained from ASPRO: HD 165185 (18 06 23.7193 -36 01 11.239)
  
  V=5.95, K=4.47
  SpT=G3V
  Expected Diameter: 0.585+/-0.040
  
  N flux from Gezari: 
  __________________________________________________________________________
  Catalog of Infrared Observations, Edition 5 (Gezari+ 1999) (ReadMe)
  *IRAS PSC V2 data for CIO sources 
  Full _r _RAJ2000 _DEJ2000 IRAS RAB1950 DEB1950 F12um q_ F25um 
  arcmin "h:m:s" "d:m:s"   "h:m:s" "d:m:s" Jy   Jy 
  1 0.340 18 06 25.4 -36 01 15 18030-3601  18 03 03.0 -36 01 36 0.5965   0.3791 
  ___________________________________________________________________________

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 ?

• YES

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 indicate for each science star OB the corresponding calibrator
 star OB (and vice versa) in the 'Instrument Comments' field ?

• YES

If you use calibrator stars which are not in the CalVin database, did
 you specify their characteristics in the README file and in the OBs ?

• YES