Last update of this page: Wed Jul 30 15:41:18 2008
Run State: TERMINATED/EP
USD review status:
O.K.!
| Pre-Imaging? | Special-Calibration? | Time-Critical? | ToO/GTO/Large program? | Carry-Over? |
|---|---|---|---|---|
|
|
|
|
|
Special Remarks:
NO REMARKS
Abstract for MTS:
Challenging programme to measure the 6Li/7Li isotopic ratios in two extremely metal poor stars: G64-12 and CD -24 17504 (=G275-4). All OBs have an attached ThAr to
ensure a very accurate wavelength scale, and two OBs have been submitted for a fast-rotator B star (HD 144294, V=4.2) to check the quality of the flat-fielding in the order containing the Li line. Expected S/N ratios are as follows:
S/N=200 @ 671nm for G64-12
S/N=140 @ 671nm for CD -24 17504
S/N=220-350 @ 671nm for HD144294 (range in S/N correspond to different exp.times specified in OBs)
Execution requirements:
1. success of the programme strongly depends on extremely accurate flat-fielding.
For this it is very important to try to center the star always at the same place on the slit (including the B star). I know that there is not an easy way to implement this, but I can guarantee that this has affected (and degraded) similar observations in the past. Maybe, the SV image of the first OB executed for this programme should be saved and filed, so that all night astronomers can try their best to reproduce it.
2. Please follow the priority sequence: start and complete first all OBs for star G64-12. Then execute the 2 OBs submitted for the fast rotator. Third priority applies to the OBs for CD -24 17504.
3. the 2 OBs for the B-star include 23x10s and 1x25s exposures. The latter will
likely saturate if seeing is better than 0.8". Best would be to execute both OBs with seeing between 1" and 1.5".
README of this run:
Web version of approved README readme_77072300.html