README web version of /home/usg/OPS/MTS/readme_xml/readme_77001600

Principal Investigator Email Address

• sana@astro.ulg.ac.be

Estimated Total Execution Time (hours, including overheads)

• 10 hours

General Description

• We propose to acquire follow-up high S/N (>250) FEROS spectra of two
   bright (V=5.4-6.5) early-type SB2 binaries. The aim is to constrain the period and
   to derive accurate orbital parameters. To do so, we need to reach a sufficient phase
   coverage. One of the critical point of this program is that the two periods are
   still ill constrained.
  
  HD 152234 (V=5.2) has  a probable period f 126 days, but aliases at 55 and 27 days
   are possible alternative. HD 152233 has a period larger than a few tens of days.
   Probable periods are 42 and 260 days.
  
  We thus require about 25 spectra of each target spread over the entire P77. These
   should typically be separated by 5-6 days in order to probe the different probable
   periods. No scientific gain can be reached if the time separation between two obtained
   spectra is less than 4 days.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• The present sources are bright, this program can thus be performed in
   about all seeing and cloud coverage conditions as long as a S/N > 250 is reached.
  
  Target can be observed during twilight.
  
  Exposure times were computed for thin cirrus coverage and seeing below 2". If this
   program is adopted as a backup program in the case of bad weather conditions (thick
   cirrus, awful seeing, large airmass) which prevent other observations, please increase
   the exposure time accordingly. Summing up several successive exposures to achieve
   the requested S/N is a valid option.
  In any case, whatever the observing conditions, we will get extract useful information
   from our spectra only if the quested S/N > 250 is reached.

Time-Critical Aspects

• Please acquire one spectrum of each target on average once every 5-6 days.
   No scientific gain will be reached if the time separation between two obtained spectra
   is less than 4 days.

Special Execution Requirements

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Special Calibration Information

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ToO Information

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ToO Activators List

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Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

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Source(s) of Pre-imaging

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Pre-imaging sources not listed above

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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 ?

• 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

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?

• N/A