Principal Investigator Email Address
mbonnefo@obs.ujf-grenoble.fr
Estimated Total Execution Time (hours, including overheads)
22.433 hours
General Description
We will observe 6 scientific targets with 2 wavelengths settings (1177.5 and 1260.0nm). They are 2M1808+11, HR7329 B, TWA5 B, TWA8 B, VB 10 and VB 8. Following each science OB, the corresponding telluric standard OB (CAL_XXX) must be observed with the same setting. All the observations (science target + telluric std) will be done in AO-mode, with a slit width of 0.4" placed in SKY mode. A nodding + jittering sequence is used along the slit (AutoNodOnSlit) with a nod throw of 10" and a jitter width of 5". For all the targets (science target + telluric std), except HR 7329 B and TWA5 B, the AO-guide star (NGS) is the Slit viewer guide star (SVGS) and the target at the same time. For HR 7329 B and TWA5 B, the NGS = SVGS, which is different from the target. - HR7329 B is located 3.99" SOUTH and 0.95" EAST of HR 7329 A. The contrast between HR 7329 B and HR7329 A is about DJ~8 mag. Once the offsets from HR 7329 A applied, the companion HR7329 B should appear into the slit (by adjusting the image acquisition DIT). - TWA 5 B is located 0.038" WEST and 1.960" NORTH of TWA5 A. The contrast between TWA5 B and TWA5 A is about DJ~4.9 mag. Once the offsets from A applied, the companion TWA5 B should appear into the slit (by adjusting the image acquisition DIT). For 2M1808+11, VB 10 and VB 8, the minimum SNR for the AO guide star parameter was let to its default value (1000) and could be adjusted if necessary. 2M1808+11, HR 7329 B and TWA5 B are faint targets and require long DITs (180s-300s). All the other sources observed have J>10 mag and require smaller DITs. The expected SNR at the reference wavelenghs for the final spectra (i.e. taking into account the total integration time per source) is 150 for the science targets and 600 for the standards.
Waiver Requests
A waiver request submitted on january 30th 2009 was approved on february 02nd 2009. We were asking for execution time of ~1.2 hrs/OB for the OBs of our source TWA5 B. But we finally decided to split our 1.2 hrs OB in 3 OBs of about 57 min each to be sure that our observations wil fullfil the airmass and the seeing constraints. A target change request was submitted to the User Support Department on january 30th 2009. It was approved on february 02nd 2009. We decided to observe TWA8 B instead of UScoCTIO 40. TWA8 B is rotating on its axis more slowly than USCOCTIO 40. This will avoid a strong blending of close spectral lines. The telluric standard star HIP083286 associated to UScoCTIO 40 will then not be observed.
Critical Observing Condition Constraints
As requested in phase I, a seeing better or equal to 0.8", an airmass lower than 1.2", and CLEAR transparency is required for the achievement of our scientific goals for all the sources except 2M1808+11 and its associated telluric standard HIP094009. For 2M1808+11 and HIP094009, the constraint on the airmass have been relaxed to 1.3 but these sources still require seeings better than 0.8" and CLEAR transparency. DIT and NDIT were computed with a precipitable water vapor of 2.3 mm. Our observations should not depend on this parameter.
Time-Critical Aspects
No time critical aspects. We only request the airmass constraint to be respected at the time of the observations.
Special Execution Requirements
No.
Special Calibration Information
Telluric standard will be observed after each science OB with the same standard wavelengh setting. Expected SNR at the reference wavelengh = 600. The two possible wavelengh settings for standard OB are then 1177.9 nm (order 48), and 1260.0 nm (order 45). For OB corresponding to the observation of 2M1808+11, HIP094009 (B8V) will be observed. It can be replaced by the observation of a B1 to A0 telluric standard. For OB corresponding to the observation of HR7329 B, HIP10090 (B9V) will be observed. It can be replaced by the observation of a B1 to A0 telluric standard. For OB corresponding to the observation of TWA5 B, HIP062128 (A0V) will be observed. It can be replaced by the observation of a B1 to A0 telluric standard. For OB corresponding to the observation of TWA8 B, HIP062128 (A0V) will be observed. It can be replaced by the observation of a B1 to A0 telluric standard. For OB corresponding to the observation of VB 10, HIP099727 (G4V) will be observed. It can be replaced by the observation of a B1-A0 of a G0V-G4V telluric standard. For OB corresponding to the observation of VB 8, HIP088078 (B9V) will be observed. It can be replaced by the observation of a B1-A0 telluric standard.
ToO Information
ToO Activators List
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?
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?
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?