README web version of /home/usg/OPS/MTS/readme_xml/readme_83026507
Principal Investigator Email Address
Estimated Total Execution Time (hours, including overheads)
General Description
The observations concerns spectroscopic observations of dwarf stars situated
in the galactic bulge but that are, at the time of observation, lensed by a foreground
object. In this way the star is greatly magnified. Normally the star is around 19-20
in V but might be even fainter thanks to extinction. However, at the time of the
lensing event the star gets many magnitudes brighter, reaching magnitudes brighter
than about V=15. Our programme is designated to obtain high-resolution spectra
at the time of the lensing event.
The observations are standard observations with UVES. The finding charts (FC) will
be unusual as they are prepared _prior_ to the lensing event producing the full
magnification. The triggers for these observations come from the MOA and OGLE collaborations.
Both monitor in I and hence our triggers will in practice be based on the I-band
magnitudes. The FC will also be in the I-band.
For each trigger we have two OBs - one for the science target and one for a B star
(for removal/identification of telluric lines).
Each trigger also includes an observation of one fast rotating B star. Also for
this object we will submit the coordinates and perhaps modify the exposure time
at the time of the trigger. This B star should be observed close in time to the
observation of the lensed bulge dwarf star but need not be observed straight after.
The finding chart for the B star will be submitted at the time of the trigger.
Waiver Requests
083.B-0265A.01.WAV
We have submitted a request to be allowed to obtain all the exposures associated
with a given target within the same OB.
For our project this means obtaining 4 1800 sec long exposures straight after each
other. Our targets are only observable
for a short time and hence it is not possible to come back to the target.
The waiver was approved 19 Janaury by Claudio Melo
\"Your waivers (all runs A-K) have been approved under the usual restriction if
ambient conditions degrade after 1h, the OB will not be repeated.\"
Critical Observing Condition Constraints
Time-Critical Aspects
Special Execution Requirements
As we are observing towards the Galactic Bulge the fields are crowded.
It therefore becomes important to chose
an appropriate slit angle in order to ensure that contaminating light from nearby
stars does not enter the slit.
We will provide a suitable angle at the time of triggering. Hence, the observer
should not have to worry about this.
Special Calibration Information
ToO Information
Each activation includes the observation of one lensed Bulge dwarf star
and one B star (for the removal of telluric lines). The B star should be observed
close in time to the main science observation. But they need to be straight after
each other.
The activator will provide coordinates for the Bulge dwarf star and for the B star.
S/he will also provide finding charts for both targets. These finding charts will
be based on the MOA and OGLE images (both these projects regularly monitor the Bulge
for lensing events and we take our triggers from the analysis of their data). Web-sites
for the projects http://sirius.astrouw.edu.pl/~ogle/ or http://bulge.astro.princeton.edu/~ogle/
and http://www.phys.canterbury.ac.nz/moa/
One of the possible triggers comes from the MOA project that operates in New Zeeland.
Due to the time differences and how that project operates we can get to know about
very interesting, quickly rising, targets as late as 5-6pm local Paranal time. We
understand that the normal requirement for ToO observations to be carried out the
same night as the trigger goes in is that the trigger reaches Paranal beofer 6pm
local time. However, for Period 82 on the direct question to the USD we got the
reply that the ToO would still be executed if we triggered no later than 7 pm (we
also asked if we needed a waiver for this but was told not). We thus will assume
that we can trigger until 7pm Please let us know if there are issues with this.
ToO Activators List
Do all your OBs comply with the instrument-specific requirements listed
on the instrument-specific Phase 2 web page ?
Do all your finding charts comply with both the general and instrument-specific
Phase 2 Web Pages ?
If you submitted OBs for standard stars, did you specify the magnitude
and spectral type of all standard stars in the OBs ?
Have you specified the S/N ratio at given wavelength in the User Comments
field of each OB?
Have you included OBs for any calibrations that you need but which are
not part of the Calibration Plan ?
If you are observing Moving Targets, have you attached suitable ephemeris
files to your OBs?
If you have preferences which OBs should be executed first, did you make
use of the User Priority field in the OBs ?
If this is a run that requires coordinated observations with other facilities,
did you give proper instructions in the Time-Critical Aspects Section ?
If you need secondary guiding, are there suitable objects within 30 arcsec
from your target ?
Last creation of page: Tue Oct 6 15:40:29 2009
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