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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 on theme: "VLTI EuroSummer Schoolday June 2006Initials. Name -- Lecture title Observability and UV coverage of sources Euro Summer School Observations and data reduction."— Presentation transcript:

1 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

2 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

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

4 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

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

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

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

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

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

10 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)

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

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

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

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

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

16 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

17 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

18 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

19 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

20 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

21 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

22 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

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

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

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

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

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

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

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

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