Principal Investigator Email Address
vicrodriguez@mpia.de
Estimated Total Execution Time (hours, including overheads)
45 hours
General Description
General Overview ---------------- Program 76.A-9004(A) is a program to determine of a large number (few hundred) of young Brown Dwarfs and low mass stars in the Orion Nebular Cluster (ONC) the rotational period in order to study the angular momentum evolution of these objects. This cluster has an age of ~1 Myr. The method is based on the rotational brightness modulation by magnetic spots on the surface of these objects, which will result in period flux variations with amplitudes of a 1-5% and with periods ranging from 0.5-10 days. The flux variations will be determined by differential photometry with respect to other nonvariable stars in the field. Program 76.A-9004(A) has many time critical aspects, as described below, and has to be carried out in the 9 nights from Nov. 18/19. -- Nov. 26/27 2005. As described below in 6 nights (Nov 19/20 to Nov 24/25) of these 9 nights the ONC is continously observed.
Waiver Requests
No Waiver Request was submitted
Critical Observing Condition Constraints
In the center of the ONC (at 05h 35m 16.3s -05 23 16.3) is the very bright star Teta01 Ori C (V=5.2). This star should be placed close to the central gap of the WFI to avoid as much as possible stray light. Most important however is that ALL IMAGES SHOULD BE CARRIED OUT AT THE SAME POSITION; I.E. WITH THE START OF A NEW OB IT SHOULD BE MADE SHURE THAT THE ALIGNMENT STAR IS PLACED AT RTD PIXELS [5294, 2424]; see finding chart for details. There are no critical observing conditions from the weather and seeing point of views as indicated in the section "Constraint Set" for the OBS. This means the program should be carried out even under very poor conditions! This will of course harm the science, but it should be possible to get still useful information on the brighter stars and on a highly variable objects, even if they are faint. Landolt field: Place star Number 670 (see finder chart, RA(J2000)=06h 52m 38s Dec(J2000)=-00d 19' 00") in the upper-left corner of chip e (see WFI nutshell) and do in the 3 filters. Shift the star to the upper-left corner of each chip, do in filter MB#815/20_ESO851. The following programs (OBs) need however photometric observing conditions: ONC_Phot, Ple_Phot. In OB Ple_Phot, place the alignment star shown in the finder chart in the upper-left corner of chip e. PLEASE, DO OBSERVATIONS OF THE ONC ALSO DURING THOSE TIMES IN WHICH THE OTHER PROGRAMS CAN'T BE CARRIED OUT DUE TO POOR WEATHER CONDITIONS.
Time-Critical Aspects
The following time plan gives an overview on how the 45 hours of observing time are distributed in bright, grey and dark time, together with the corresponding OBs. There are 48 Science OBs. Please use the corresponding OB for each of these nights. night (Nov. 18/19, moonphase (MPh) = 0.91) Please do the observations in the following sequence: * calibration fringe frames 2.9 h bright OBs = Fr_Nov18-1, Fr_Nov18-2, Fr_Nov18-3 * Orion: 1.4 h bright (OBs = ONC_Nov18-1, ONC_Nov18-2) * calibration fringe frames 1.8 h bright OBs= Fr_Nov18-4, Fr_Nov18-5 * Standard star calibration(Landolt field 98): 1.2 h bright OBs = SA98_Nov18-1, SA98_Nov18-2 * Orion: 0.7 h bright (ONC_Nov18-3). Between Nov19/20 and Nov.25/26: 1.2 - 1.5 h dark Pleiades for spectral type calibration under photometric condition in the 815, 856 and 914 filters (OBs = Ple_Phot) Between Nov19/20 and Nov.24/25: 1.2 - 1.5 h grey Orion for spectral type calibration under photometric conditions in the 815, 856 and 914 filters (OBs = ONC_Phot) night (Nov. 19/20, MPh = 0.84 ) * 4.5 h grey + 0.5 h dark in Orion (OBs = ONC_Nov19-1,ONC_Nov19-2,ONC_Nov19-3,ONC_Nov19-4,ONC_Nov19-5) night (Nov. 20/21, MPh = 0.76 ) 4.0 h grey + 1.0 h dark in Orion (OBs = ONC_Nov20-1,ONC_Nov20-2,ONC_Nov20-3,ONC_Nov20-4,ONC_Nov20-5, ONC_Nov20-6) night (Nov. 21/22, MPh = 0.68 ) 3.2 h grey + 2.5 h dark in Orion (OBs = ONC_Nov21-1,ONC_Nov21-2,ONC_Nov21-3,ONC_Nov21-4,ONC_Nov21-5, ONC_Nov21-6) night (Nov. 22/23, MPh = 0.59 ) 3.0 h grey + 3.0 h dark in Orion (OBs = ONC_Nov22-1,ONC_Nov22-2,ONC_Nov22-3,ONC_Nov22-4,ONC_Nov22-5, ONC_Nov22-6) night (Nov. 23/24, MPh = 0.50) 2.5 h grey + 3.5 h dark in Orion (OBs = ONC_Nov23-1,ONC_Nov23-2,ONC_Nov23-3,ONC_Nov23-4,ONC_Nov23-5, ONC_Nov23-6) night (Nov. 24/25, MPh = 0.40 ) 2.5 h grey + 1.5 h dark in Orion (OBs = ONC_Nov24-1,ONC_Nov24-2,ONC_Nov24-3,ONC_Nov24-4,ONC_Nov24-5) night (Nov. 25/26, MPh = 0.30 ) 1 h grey in Orion (OBs = ONC_Nov25) night (Nov. 26/27) 1 h dark in Orion (OBs = ONC_Nov26)
Special Execution Requirements
Special Calibration Information
6 domeflats each day (i.e for night Nov18/19 DomeA_815_No18). During the hole run 7 times 3 twilight flats (see calibration OBs Sky_856-914_Nov18, Sky_856-914_Nov19, Sky_815_Nov21, Sky_815_Nov22, Sky_815_Nov23, Sky_815_Nov24, Sky_815_Nov24) Each day 10 biases. Only the standard calibration is requiered as given in the section "Calibration Requirements" for each of the OBs.
ToO Information
ToO Activators List
Is this a Pre-imaging run ?
false
Pre-imaging Requirements
Source(s) of Pre-imaging
Pre-imaging sources not listed above
Do all your OBs comply with the instrument-specific requirements listed on the instrument-specific Phase 2 web page ?
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 ?
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 ?
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'?
Have all your submitted OBs the same filter for the acquisition template and for the first science template?
Did you combine calibration templates with science templates for any OB?
Did you combine imaging and spectroscopic templates for any OB?
Did you submit any Focus template?