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Molinari E.,INAF TNG | Daniela T.,National institute for astrophysics | Toso G.,National institute for astrophysics | Spano P.,National institute for astrophysics | And 8 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

The challenge of building extremely large telescope pushes forward the parallel ability to measure and test optical components of large sizes. Here we present the optical bench setup for the Demonstration Prototype (DP) of the voice coil controlled adaptive mirror M4AU of the E-ELT. A set of three devices has been chosen and used for the tests, whose results are also shown. The performance demonstrated that this is a viable and trusted technology and the DP tests were highly representative of the whole procedure that could be applied to the real, full size unit. © 2010 SPIE. Source


Oliva E.,National institute for astrophysics | Origlia L.,National institute for astrophysics | Maiolino R.,National institute for astrophysics | Baffa C.,National institute for astrophysics | And 17 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

GIANO is a high resolution (R∼50,000) IR spectrograph which provides a quasi-complete coverage of the 0.95-2.5μm wavelengths range in a single exposure. The instrument was integrated and tested in Arcetri-INAF (Florence, Italy) and will be commisioned at the 3.58m TNG Italian telescope in La Palma. The major scientific goals include the search for rocky planets with habitable conditions around low-mass stars, quantitative spectroscopy of brown dwarfs, accurate chemical abundances of high metallicity stars and stellar clusters. This presentation describes the status of the instrument and presents the first results obtained in laboratory during the acceptance tests. © 2012 SPIE. Source


Spano P.,National institute for astrophysics | De Caprio V.,Istituto di Astrofisica Spaziale e Fisica Cosmica | La Foresta M.,University of La Laguna | Molinari E.,INAF TNG | And 6 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

A new mechanical interface between the telescope Nasmyth derotator and the focal plane instrumentation has been developed and built for the robotic REM telescope in La Silla. A light-weighted flange will substitute the existing one in order to improve performances in term of mechanical flexures. A new ghost-free, high performances, dichroic has been designed and installed inside the new mechanical flange, improving the efficiency of the wavelength splitting between the visible and the near-infrared channels. The visible camera has been completely redesigned in order to get simultaneous multi-band coverage within the existing 10'x10' field of view. Four bands will be observed onto the same 2kx2k, 13.5 micron pixel, detector. Band splitting is obtained with plate dichroics, working at 45 deg of incidence angle. It will allow to fast observe gamma-ray burst afterglow from the 400 nm up to 2.5 micron, to better characterize spectral features of these fastly evolving sources. © 2010 Copyright SPIE - The International Society for Optical Engineering. Source


Origlia L.,National institute for astrophysics | Oliva E.,National institute for astrophysics | Baffa C.,National institute for astrophysics | Falcini G.,National institute for astrophysics | And 12 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

GIANO is the high resolution near IR spectrograph recently commissioned at the 3.58m Telescopio Nazionale Galileo in La Palma (Spain). GIANO is the first worldwide instrument providing cross-dispersed echelle spectroscopy at a resolution of 50,000 over the 0.95 - 2.45 micron spectral range in a single exposure. There are outstanding science cases in the research fields of exo-planets, Galactic stars and stellar populations that could strongly benefit from GIANO observations down to a magnitude limit comparable to that of 2MASS. The instrument includes a fully cryogenic spectrograph and an innovative fiber system transmitting out to the K band. It also represents a formidable laboratory to test performances and prototype solutions for the next generation of high resolution near IR spectrographs at the ELTs. First results from sky tests at the telescope and science verification occurred between July 2012 and October 2013 will be presented. © 2014 SPIE. Source


Origlia L.,National institute for astrophysics | Oliva E.,National institute for astrophysics | Sanna N.,National institute for astrophysics | Mucciarelli A.,University of Bologna | And 16 more authors.
Astronomy and Astrophysics | Year: 2016

Aims. The Scutum complex in the inner disk of the Galaxy has a number of young star clusters dominated by red supergiants that are heavily obscured by dust extinction and observable only at infrared wavelengths. These clusters are important tracers of the recent star formation and chemical enrichment history in the inner Galaxy. Methods. During the technical commissioning and as a first science verification of the GIANO spectrograph at the Telescopio Nazionale Galileo, we secured high-resolution (R 50 000) near-infrared spectra of five red supergiants in the young Scutum cluster RSGC3. Results. Taking advantage of the full YJHK spectral coverage of GIANO in a single exposure, we were able to measure several tens of atomic and molecular lines that were suitable for determining chemical abundances. By means of spectral synthesis and line equivalent width measurements, we obtained abundances of Fe and iron-peak elements such as Ni, Cr, and Cu, alpha (O, Mg, Si, Ca, Ti), other light elements (C, N, F, Na, Al, and Sc), and some s-process elements (Y, Sr). We found average half-solar iron abundances and solar-scaled [X/Fe] abundance patterns for most of the elements, consistent with a thin-disk chemistry. We found depletion of [C/Fe] and enhancement of [N/Fe], consistent with standard CN burning, and low 12C /13C abundance ratios (between 9 and 11), which require extra-mixing processes in the stellar interiors during the post-main sequence evolution. We also found local standard of rest VLSR=106 km s-1 and heliocentric Vhel=90 km s-1 radial velocities with a dispersion of 2.3 km s-1. Conclusions. The inferred radial velocities, abundances, and abundance patterns of RSGC3 are very similar to those previously measured in the other two young clusters of the Scutum complex, RSGC1 and RSGC2, suggesting a common kinematics and chemistry within the Scutum complex. © ESO, 2015. Source

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