README web version of /home/usg/OPS/MTS/readme_xml/readme_84064000

Principal Investigator Email Address

• wgieren@astro-udec.cl

Estimated Total Execution Time (hours, including overheads)

• 26:59:24

General Description

• The main goal of this project is to obtain spectroscopic orbits for two
   eclipsing systems, which consist of a Cepheid and a G type giant. Both orbital periods
   are very long (300 
  and 500 days, respectively). Our strategy is to obtain a good coverage of the pulsational
   
  period close to expected quadrature (as close as possible to the extremal orbital
   RVs)
  in order to precisely disantangle both kind of RV variations. The pulsationsal 
  periods are of 3.8 and 1.3 days for cep227 and cep1812.  Therefore it makes sense
   
  to observe these systems not more frequently than every 2 (Cep227) and 1 (cep1812)
   
  hours, respectively on a given night. Please see Special execution requirements
   for more details.
  
  We relaxed significantly the weather constraint (thin cirrus, 1.5" seeing) to get
   
  better chances to execute our OBs on critical dates.

Waiver Requests

• The change of the instrument sutup to dic1 390+564
  has been granted

Critical Observing Condition Constraints

• No

Time-Critical Aspects

• Our OBs should be extecuted on specified dates. See special execution
   requirements for more details.

Special Execution Requirements

• For Cep227 49 OBs, to be executed during  4 time slots, were prepared
   (see table below). 
  
        time interval            OBs                      Observations
  
  I    2009.10.16 - 2009.10.23  (cep227-I-*)     on 5 nights, 2 OBs per given  night
   (separated by 2 hours)   10 OBs
  II   2009.10.29 - 2009.11.07  (cep227-II-*)    on 7 nights, 3 OBs per given  night
   (separated by 2 hours)   21 OBs
  III  2009.11.11 - 2009.12.02  (cep227-III-*)   on 5 nights, 2 OBs per given  night
   (separated by 2 hours)   10 OBs
  IV   2010.03.20 - 2010.03.31  (cep227-IV-*)    on 4 nights, 2 OBs per given  night
   (separated by 2 hours)    8 OBs
  
  When during one given night execution of more than one exposure is not possible
   please do it on another night 
  during the corresponding  time intervals specified inside our OBs. 
  However, please note that observations conducted as specified in the table above
   would be optimal 
  for disentagling orbital and pulsational velocities, so we would appreciate very
   much 
  if our OBs could be executed in such a way every time when  possible. 
  The most important nights are those close to 2009-11-03 (orbital RV maximum). 
  Please try to execute as many as possible OBs during 2009.11.01 - 2009.11.07 ! (but
   not more than 3 on a given night, 
  e.g. separated by 2 hours).
  
  In the case of cep1812 the pulsational period is shorter so exposures could be separated
   by 1 hour.
  For this system we prepared 10 OBs, which should be executed during 2010.03.10 -
   2010.03.31 (up to two OBs 
  can be executed on a given night due to visibility of the LMC during this period
   of time).

Special Calibration Information

• The main goal of our project is to obtain precise RVs for  Cepheids in
   eclipsing systems.
  This is crutial to disantangle orbital and pulsational velocities and to derive
   
  distances with accuracy of 3-4 % to a given system.
  Therefore arc calibrations  are attached to all OBs.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

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

If you need secondary guiding, are there suitable objects within 30 arcsec
 from your target ?

• N/A