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Accessing RAVE hardware for PLATO PIC Ulisse Munari Tomaz Zwitter.

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Presentation on theme: "Accessing RAVE hardware for PLATO PIC Ulisse Munari Tomaz Zwitter."— Presentation transcript:

1 accessing RAVE hardware for PLATO PIC Ulisse Munari Tomaz Zwitter

2 RAVEspectroscopy Å range Å range 7500 resolving power 7500 resolving power Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011

3 RAVEspectroscopy Å range Å range 7500 resolving power 7500 resolving power from repeated and standard star observations: RV = 1.5 km/s Teff = 125 K Teff = 125 K log g = 0.2 dex log g = 0.2 dex [ M/H] = 0.1 dex [ M/H] = 0.1 dex Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 =300 pc =2 kpc

4 RAVEspectroscopy Å range Å range 7500 resolving power 7500 resolving power Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011

5

6 Geneva- Copenhagen , ,342 spectra of 385, ,252 stars 100,000 dwarfs cooler than F dwarfs (of any metallicities, chromospheric activity, binarity, etc.) over the 2000 deg 2 of the PLATO primary field of view 9000 dwarfs (of any metallicities, chromospheric activity, binarity, etc.) over the 2000 deg 2 of the PLATO primary field of view

7 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011

8 UKSchmidt Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011

9 150 fiber bundles 3 plates: one exposes on the sky, while another is confi- gured for next exposure tipically 5 fields per night equiv. to 500/600 stars

10 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 n° of spectra collected per lunation limitations: weather + n° of available fibers per plates some periods of low statistics due to long calibration runs with few stars exposed per plate or very long integration on star clusters long term average: 61,000 spectra per year

11 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 n° of spectra collected per lunation limitations: weather + n° of available fibers per plates some periods of low statistics due to long calibration runs with few stars exposed per plate or very long integration on star clusters Dec 2010: new fiber bundle for plate #2, back to 140 fibers April 2011: new fiber bundle for plate #1, back to 140 fibers ? Fall 2011: new fiber bundle for plate #3 ?

12 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 n° of spectra obtained on each field. black = ,342385, : 464,342 spectra of 385,252 stars

13 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 n° of visits to a given field

14 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 re-observatios of randomly selected RAVE targets coupled with high RV accuracy (±1.5 km/s) has allowed the discovery of many new SB1 binaries

15 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 many already known SB1 stars have been by chance surveyed by RAVE, and their measured RVs well match published orbits

16 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 accessing RAVE at present RAVE is fully funded to June 2012, probable to Dec After that the situation is unclear at the moment, Dec After that the situation is unclear at the moment, including possible interest for the hardware by other parties including possible interest for the hardware by other parties (like a revamped interest by the 6dF galaxies survey) (like a revamped interest by the 6dF galaxies survey) RAVE can suspend operation for 6 months (or months) to allow PLATO to access the hardware before 2013, to allow PLATO to access the hardware before 2013, if necessary if necessary with RAVE-funded (2011) replacement of old and damaged fiber bundles (as left over by the 6dF red-shift galaxy survey) and bundles (as left over by the 6dF red-shift galaxy survey) and provision of a brand new fiber plate, the number of available provision of a brand new fiber plate, the number of available fibers will ~double compared to last four years fibers will ~double compared to last four years

17 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 accessing RAVE PLATO PIC has to provide the list of 50,000 stars to be observed, selected on appropriate criteria, and matching the observed, selected on appropriate criteria, and matching the multiplex capability of the instrument multiplex capability of the instrument The UK Schmidt staff carries out the observations and deliver the 2D frames to PLATO PIC (science, flat, dark, calib, etc.) the 2D frames to PLATO PIC (science, flat, dark, calib, etc.) the cost for 6 months of exclusive use of the telescope is 300,000 Aus$ 220,000 Euro (3 dark weeks per lunation) 300,000 Aus$ 220,000 Euro (3 dark weeks per lunation) this means that under mean local weather statistics 50,000 suitable spectra can be collected in 6 months of operation suitable spectra can be collected in 6 months of operation on stars of V 11.5 on stars of V 11.5

18 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 accessing RAVE extracting/calibrating/analysing the 2D data and getting out of them good VRad, Teff, log g and [M/H] is an expert out of them good VRad, Teff, log g and [M/H] is an expert process, that would take long time to work out from scratch process, that would take long time to work out from scratch the RAVE Consortium will be willing to carry out these tasks for free with its proprietary pipelines and paid man-power, if for free with its proprietary pipelines and paid man-power, if in return the RAVE Consortium will be allowed to use the in return the RAVE Consortium will be allowed to use the products (VRad, Teff, log g, [M/H],…) for its own studies of products (VRad, Teff, log g, [M/H],…) for its own studies of the Milky Way structure and evolution, once they have served the Milky Way structure and evolution, once they have served the PLATO PIC goals of selecting and characterizing the mission the PLATO PIC goals of selecting and characterizing the mission targets targets some 30,000 Euro could be saved if a PLATO student would be some 30,000 Euro could be saved if a PLATO student would be employed in the observations. Because the UK Schmidt + 6dF employed in the observations. Because the UK Schmidt + 6dF is an expert instrument, this student needs extensive training. is an expert instrument, this student needs extensive training. RAVE could offer this training during its observing runs in the RAVE could offer this training during its observing runs in the months preceeding the start of PLATO operations. months preceeding the start of PLATO operations.

19 Ulisse Munari & Tomaz Zwitter PLATO PIC Padova Jan 27, 2011 accessing RAVE maintaining the current RAVE wavelength range ( , well suited for solar-type dwarfs) would build on already secured well suited for solar-type dwarfs) would build on already secured extensive calibration observations, saving precious observing time extensive calibration observations, saving precious observing time the cost of 220,000 Euro appears well within grasp of funding requests to national agencies willing to support PLATO requests to national agencies willing to support PLATO


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