README web version of /home/usg/OPS/MTS/readme_xml/readme_79007300

Principal Investigator Email Address

• edepagne@astro.puc.cl

Estimated Total Execution Time (hours, including overheads)

• 29h

General Description

• We intend to analyse a sample of O stars of NGC 346, the largest HII region
   in the SMC. The analysis will be based on high-resolution spectra and NLTE models,
   and will account for NLTE metal line blanketing, spherical extension, and stellar
   winds. We will derive for each star the basic stellar parameters, apparent rotational
   velocities, surface chemical composition and wind properties. This analysis will
   allow us to obtain a map of CNO abundances across the parameter range of O stars,
   probing the efficiency of rotationally-induced mixing. To achieve our science goals,
   near-UV spectra are critical and we need a S/N > 60 in this wavelength range
   to properly derive oxygen abundances.
  
  Finding charts have been obtained from ALADIN. We could not reach a better quality
   for the field size of 1x1 arcminutes, as the targets are quite faint and the fields
   crowded. The targets are always at the center of the FC and indicated by a (pink)
   cross and a down arrow.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Exposure times have been computed with the UVES ETC fo period 79, assuming
   a seeing of 1.0" and
  airmass=2.0 and we ask for priority 1 to 3 targets to be observed for such conditions
   or  better if possible.

Time-Critical Aspects

• N/A

Special Execution Requirements

• N/A

Special Calibration Information

• N/A

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 need secondary guiding, are there suitable objects within 30 arcsec
 from your target ?

• N/A