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Time Critical |
Last update of this page: Thu Jul 24 15:41:18 2008
Run State: COMPLETED
USD review status:
O.K.!
| Pre-Imaging? | Special-Calibration? | Time-Critical? | ToO/GTO/Large program? | Carry-Over? | |
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Special Remarks:
Was started on 12./13. Nov. Try to execute one OB every 2nd night. Never two OBs in the same night!
Abstract for MTS:
0.025"/pix K-band observations to search for periodicity in the brightest stars of R136. One known period is ~4.4d, hence the sampling of every other day.
The OBs are set up to close the loop on the reference star, then the offsets lead to 4 different position within a few arcsec, including all of the 6 target stars (marked on overview FC, individual FCs available for each pointing). Deliberately, no dedicated sky frames are taken.
The 7 OBs are identical, and you should attempt to execute them within ~2 weeks, one OB every 2 nights. Therefore, please don't start it before a solid visitor/VLTI block.
It is essential that seeing constraints and airmass are met in order to resolve their targets in this crowded field.
On execution of the 1st OB, it was found that the AO loop cannot be closed on star 111. Star 108 needs to be used instead. This is Thomas' description of the acquisition procedure (from ticket USD-14794):
The acquisition procedure is like:
0. ACQUISITION !!!
1. center 108 in open loop (telescope offset)
2. close loop
3. center 111 on the large scale in closed loop (FS offset!)
4. fine center 111 on the 0.025 scale (FS offset)
5. SCIENCE !!!
README of this run:
Web version of approved README readme_76056300.html