README web version of /home/usg/OPS/MTS/readme_xml/readme_79010200

Principal Investigator Email Address

• isella@arcetri.astro.it

Estimated Total Execution Time (hours, including overheads)

• 12:00

General Description

• We propose to use VLT ANTU/CRIRES high resolution (R=30000) observations
   to measure the near-infrared ro-vibrational steam (between 2.280-2.292 um) and CO
   overtone (2.923-2.310 um) emission in a sample of intermediate-mass pre-main sequence
   Herbig Ae stars. The main goal of the survey is to study the physical and chemical
   conditions of the dust-depleted inner gaseous disk. We plan to use our data to constrain
   the temperature and density of the gas, the inner disk kinematics and the abundance
   H2O/CO, which is expected to depend on the physical conditions of the gas in the
   inner disk and on the UV radiation field. Model predictions indicate that for our
   sample of stars both steam and CO should be detectable. We expect to detect steam
   lines with an intensity of about 3-5% of the continuum. For detection at 10sigma,
   a SNR>300 is required. Overtone CO emission is expected to be between a factor
   2 to 10 stronger than the steam lines. The choosen set up configuration (25/1/i
   and 25/1/n) cover all the spectral range between 2.280 and 2.310 where both the
   CO and steam line should be present. Whit a spectral resolution of 0.8A we expect
   to resolve the individual lines and resolve the line profile

Waiver Requests

• Waiver request for OBs longer than 1h and slit of 0.8 arcsec has been
   accepted (WeiverID 0.79.C-0102A.01)

Critical Observing Condition Constraints

• none

Time-Critical Aspects

• none

Special Execution Requirements

• none

Special Calibration Information

• A good telluric calibration is fundamental in order to detect the faint
   steam lines. Calibration OBs should be therefore executed after each  scientific
   OB. SNR on the calibrator have to be higher (400-500) than the SNR on the relative
   scientific object. Calibrators with a spectral type between A and B are allowed.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Do the README file and the instrument comments of the telluric stars
 OBs include the required S/N/pixel of the spectrum of the telluric star, its spectral
 type and allowed spectral range?

• YES

Do any OBs include wavelength or flatfield calibrations?

• N/A

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If the slit viewer guide star is different from the target, are the RA
 and DEC offsets accurate to within 0.05 arcsec and do they take into account the
 relative proper motion between the two objects?

• N/A

If you have preferences which OBs should be executed first for objects
 at similar RA, did you make use of the User Priority field in the OBs?

• N/A