scholarly journals Adaptive optics high-resolution spectroscopy: present status and future direction

1999 ◽  
Author(s):  
Jian Ge ◽  
Dino R. Ciarlo ◽  
Paul J. Kuzmenko ◽  
Charles R. Alcock ◽  
Bruce A. Macintosh ◽  
...  
Keyword(s):  
High Resolution ◽  
Adaptive Optics ◽  
Present Status ◽  
High Resolution Spectroscopy ◽  
Future Direction

scholarly journals Very high-resolution spectroscopy for extremely large telescopes using pupil slicing and adaptive optics

2007 ◽  
Vol 15 (5) ◽  
pp. 1983 ◽  
Author(s):  
Jacques M. Beckers ◽  
Torben E. Andersen ◽  
Mette Owner-Petersen
Keyword(s):  
High Resolution ◽  
Adaptive Optics ◽  
High Resolution Spectroscopy ◽  
Large Telescopes ◽  
Very High

HIGH-RESOLUTION SPECTROSCOPY USING RI-BEAMS – SHARAQ PROJECT

2009 ◽  
Vol 18 (10) ◽  
pp. 2011-2014
Author(s):  
SUSUMU SHIMOURA
Keyword(s):  
High Resolution ◽  
Charge Exchange ◽  
Present Status ◽  
Energy Charge ◽  
Intermediate Energy ◽  
Beam Line ◽  
Nuclear Spectroscopy ◽  
High Resolution Spectroscopy ◽  
Exchange Reactions

The SHARAQ project is presented along high-resolution nuclear spectroscopy using RI beams, where the characteristics of intermediate-energy charge exchange reactions of RI beams are discussed. The present status of construction of the SHARAQ spectrometer and the high-resolution beam line is presented.

scholarly journals The Surface of Titan from Adaptive Optics Observations

2002 ◽  
Vol 12 ◽  
pp. 629
Author(s):  
Seran G. Gibbard ◽  
Bruce A. Macintosh ◽  
Claire E. Max ◽  
Henry Roe ◽  
Imke de Pater ◽  
...  
Keyword(s):  
High Resolution ◽  
Solar System ◽  
Visible Light ◽  
Adaptive Optics ◽  
Surface Albedo ◽  
Near Infrared ◽  
High Resolution Spectroscopy ◽  
Surface Features ◽  
Infrared Wavelengths ◽  
Adaptive Optics System

AbstractSaturn’s largest moon Titan is the only satellite in the Solar System with a substantial atmosphere. Photolysis of methane creates a hydrocarbon haze in Titan’s atmosphere that is opaque to visible light. The new adaptive optics system on the 10–meter W. M. Keck Telescope enables us to observe Titan with a resolution of 0.04 arcseconds, or 20 resolution elements across the disk. By observing at near-infrared wavelengths that are methane band windows we can see through Titan’s hydrocarbon haze to the surface beneath. Recent adaptive optics images of Titan both in broadband (J, H, and K) filters and in narrowband filters that selectively probe Titan’s surface and atmosphere allow us to determine surface albedo and properties of the hydrocarbon haze layer. Future observations will include high-resolution spectroscopy coupled with adaptive optics to obtain spectra of individual surface features.

Improving the Efficiency of High-Resolution Spectroscopy on the 6-m Telescope Using Adaptive Optics Techniques

2020 ◽  
Vol 75 (4) ◽  
pp. 468-481
Author(s):  
V. G. Klochkova ◽  
Yu. V. Sheldakova ◽  
V. V. Vlasyuk ◽  
A. V. Kudryashov
Keyword(s):  
High Resolution ◽  
Adaptive Optics ◽  
High Resolution Spectroscopy

scholarly journals Investigating the nature of the extended structure around the Herbig star RCrA using integral field and high-resolution spectroscopy

2019 ◽  
Vol 632 ◽  
pp. A18
Author(s):  
E. Rigliaco ◽  
R. Gratton ◽  
D. Mesa ◽  
V. D’Orazi ◽  
M. Bonnefoy ◽  
...  
Keyword(s):  
High Resolution ◽  
Adaptive Optics ◽  
Position Angle ◽  
Geometrical Model ◽  
High Resolution Spectroscopy ◽  
Continuum Emission ◽  
Extended Structure ◽  
Slow Wind ◽  
The Individual ◽  
Integral Field

Context. We present a detailed analysis of the extended structure detected around the young and close-by Herbig Ae/Be star R CrA. This is a young triple system with an intermediate mass central binary whose separation is of the order of a few tens of the radii of the individual components, and an M-star companion at about 30 au. Aims. Our aim is to understand the nature of the extended structure by means of combining integral-field and high-resolution spectroscopy. Methods. We conducted the analysis based on FEROS archival optical spectroscopy data and adaptive optics images and integral-field spectra obtained with SINFONI and SPHERE at the VLT. Results. The observations reveal a complex extended structure that is composed of at least two components: a non-uniform wide cavity whose walls are detected in continuum emission up to 400 au, and a collimated wiggling-jet detected in the emission lines of helium and hydrogen. Moreover, the presence of [Fe II] emission projected close to the cavity walls suggests the presence of a slower moving wind, most likely a disk wind. The multiple components of the optical forbidden lines also indicate the presence of a high-velocity jet co-existing with a slow wind. We constructed a geometrical model of the collimated jet flowing within the cavity using intensity and velocity maps, finding that its wiggling is consistent with the orbital period of the central binary. The cavity and the jet do not share the same position angle, suggesting that the jet is itself experiencing a precession motion possibly due to the wide M-dwarf companion. Conclusions. We propose a scenario that closely agrees with the general expectation of a magneto-centrifugal-launched jet. These results build upon the extensive studies already conducted on R CrA.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

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