VLTI EuroSummer Schoolday June 2006Initials. Name -- Lecture title Observability and UV coverage of sources Euro Summer School Observations and data reduction.

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Presentation transcript:

VLTI EuroSummer Schoolday June 2006Initials. Name -- Lecture title Observability and UV coverage of sources Euro Summer School Observations and data reduction with the Very Large Telescope Interferometer Goutelas, France 4-16, 2006 D. Ségransan Observatoire de l’Université de Genève, Switzerland 5th June 2006

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage Observability Single dish telescope : Constraints are HA and Fz => one needs LST, RA and DEC Global efficiency is high (uv coverage, low overheads) Interferometers : Constraints : HA, Fz, (U,V) => one needs LST, RA, DEC, Bvect Hardware constraints : Delay lines stroke, Dome vignetting Global efficiency is low (poor uv coverage, high overheads) A good Observation Preparation Software is required

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

ESO Lunch Talk - D. Ségransan - Better understanding Very Low Mass Objects - December 3 rd VLTI at ESO Paranal, Chile Baselines: up to 200 m 4 8-meter-telescopes 4 2-meter-telescopes

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage Reminder : what ’s the UV plane (4) A 2 telescope interferometer gives access to 1 (u,v) point per measurement. A 3 telescope interferometer gives access to 3 (u,v) point per measurement. We have access to high spatial freq but … A lot of GAPS remain in the UVplane | Visibility| 2, cut-off frequency & uv-tracks (6 hours observation)

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

Observing with the VLTID. Ségransan -- Observability and UV coverage5th February 2002 What is an appropriate UV-plane sampling? Well, it depends …  on the object you are observing  angular size of the source  simple vs. complex source  model fitting vs. image reconstruction  on the instrument you are using  accuracy on visibilities  spectral resolution

Observing with the VLTID. Ségransan -- Observability and UV coverage5th February 2002 What is an appropriate UV-plane sampling? Radius measurement with NPOI N telescopes >2 accuracy on V 2 > 1% impressive UV coverage use of spectral resolution to improve UV coverage

Observing with the VLTID. Ségransan -- Observability and UV coverage5th February 2002 What is an appropriate UV-plane sampling? Radius measurement with COAST N telescopes = 3 accuracy on V 2 > 5% good UV coverage  transition in the closure phase is observed

Observing with the VLTID. Ségransan -- Observability and UV coverage5th February 2002 What is an appropriate UV-plane sampling? Radius measurement with IOTA/FLUOR N telescope = 2 (at that time) accuracy on V 2 << 1% poor UV coverage but … a few points at the right place do the job

Observing with the VLTID. Ségransan -- Observability and UV coverage5th February 2002 What is an appropriate UV-plane sampling? Binary star observation IOTA accuracy on V 2 > 1% limited UV coverage but … binary observed at different orbital phases

Observing with the VLTID. Ségransan -- Observability and UV coverage5th February 2002 What is an appropriate UV-plane sampling? Binary star observation with PTI accuracy on V 2 > 1% limited UV coverage but … binary observed at different phases and … radial velocities

Observing with the VLTID. Ségransan -- Observability and UV coverage5th February 2002 What is an appropriate UV-plane sampling ? There is no simple answer. This is why ASPRO was created

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage

VLTI EuroSummer Schoolday June 2006D. Ségransan -- UV coverage