README web version of /home/usg/OPS/MTS/readme_xml/readme_80028200

Principal Investigator Email Address

• Paul.Crowther@sheffield.ac.uk

Estimated Total Execution Time (hours, including overheads)

• 2.3

General Description

• Seek narrow-band imaging of M74 using the HeII and HeII/6500 filters to
   search for HeII 4686 emission line sources (Wolf-Rayet stars) plus complementary
   on-Halpha and off-Halpha (Halpha/4500) imaging to identify O star content, and broad-band
   B and V filter imaging to obtain continuum magnitudes of candidates. Candidates
   to be followed-up spectroscopy in a future period (not strictly a pre-imaging run).
   
  
  Target is at +15 dec, so limited availability - below secz=2 for 5 hrs during Oct
   and Nov.
  
  Three OBs in total:
  
  M74-He2 - HeII imaging (56 min execution time)
  M74-offHe2 - HeII/6500 imaging (56 min execution time)
  M74-Halpha - Halpha, Halpha/4500, B, V imaging (25 min in execution time)
  
  Require consistent conditions for execution of M74-He2 and M74-offHe2, *ideally*
   to be obtained consecutively. FORS1 imaging includes an occulting bar to avoid a
   fairly bright source to SW. Positioning of inter-CCD gap avoids vast majority of
   HII regions in M74. Reference targets selected from archival FORS images of M74.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Require consistent conditions for execution of M74-He2 and M74-offHe2,
   *ideally* to be obtained consecutively.

Time-Critical Aspects

• None

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• Please obtain spectrophotometric standard during twilight for narrow-band
   imaging (HeII, HeII/6500, Halpha, Halpha/4500) plus photometric standard for broad-band
   (B and V) imaging.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

Source(s) of Pre-imaging

• ---(Empty)---

Pre-imaging sources not listed above

• ---(Empty)---

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 ?

• YES

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

If you have prepared your finding charts with tools other than FIMS,
 do they comply with the specifications on the FORS1 Phase 2 web page ?

• YES