Fundamental parameters and time evolution of mass loss are investigated for post-main-sequence stars in the Galactic globular cluster 47 Tucanae (NGC 104). ... We confirm the cluster's distance as d = 4611+213 -200 pc and age as 12 ТБ 1 Gyr. Horizontal branch models appear to confirm that no more red giant branch mass loss occurs in 47 Tuc than in the more metal-poor Я? Centauri, though difficulties arise due to inconsistencies between the models. ...

... The potential energy given off by stars on this track is 17#17, while the stellar luminosity 18#18. ... If a star is measured to 2 accuracy and has at 10 modulation (0.2 magnitudes peak to peak), the S/N is 5...stars. The sensitivity limit varied from field to field on the basis on the brightest available field standard star. ... Edwards et al. (1993) uses H-K=0.2 as their cut off for stars without disks. I use 0.4 as an upper limit because the errors in H-K can be 213#213 0.1...drive. ...

Next: CCD Scientific Performance Up: CCD Operation Previous: CCD Operation . A visible light photon releases only one electron-hole pair, and consequently many photons must be collected in each pixel for a measurable signal to be produced. ... This use as an imaging X-ray spectrometer requires that no more than one photon is incident on each pixel in any image frame, which imposes a requirement that image collection times be limited to ~seconds for typical astronomical applications. ...

The 25th International Symposium on Space Terahertz Technology , 27 ­ 30 April 2014, Moscow, Russia Power Load Dependencies of Cold Electron Bolometer Optical Response at 350 GHz Mikhail A. Tarasov , Valerian S. Edelman , Andrey B. Ermakov , Sumedh H. Mahashabde , and Leonid S. Kuzmin . ... At high power load levels and low temperatures the changes of tunneling current, dynamic resistance and voltage response have been explained by non -thermal energy distribution of excited electrons. ...

September 24, 2010 (Friday) Bob Hirosky, University of Virginia . ... This talk summarizes some of our latest results from the summer 2010 conferences and discusses future prospects with a substantial increase of available data. 2:00pm, 472 Willamette Hall . ... CMS has found a ridge in the two-prticle correlation of hadrons produced in pp collisions at 7 TeV at LHC. ... Interpretation of the phenomenon will be given. 4:00pm, 472 Willamette Hall . ...

The approaches mentioned in the section title belong to one family which is called in Newton's book [ 56 ] the short waves or high energy approximation (HEA). It means the scattering by soft particles (or potentials) in the case of the wavelengths short in comparison with the particle size (or correspondingly the case of scattering of high energy particles by the potentials). ...

... A molecular cloud in the interstellar medium may be considered as spherical and of uniform density and fixed temperature as it undergoes expansion or contraction. Assume the opacity of material in the molecular cloud has a value . ... How will this affect cloud fragmentation? (e) In the stages of collapse of a gas cloud before it becomes optically thick, its temperature is determined by the balance between compressional heating and radiation of energy from the cloud. ...

SIGNAL TO NOISE RATIO FOR SINGLE ELECTRON EVENTS . There are two types of noise present during single electron counting: the noise per event and the noise per pixel. ... 3.2 Dark Current Shot Noise . ... N g = gain noise discussed in section 1 above . ... G * S opt / S e = optical noise; the gain of a single electron times the ratio of the optical to electrical signal (see discussion above). k = 0 if background subtraction is used, or the pixel to pixel dark current non-uniformity if not. ...

Molecular Lines in Star Formation Regions ­ the ALMA Challenge Paul Jones University of New South Wales Universidad de Chile 1 Molecular Lines in Star Formation Regions - Molecular lines trace the kinematics and chemistry (composition) of molecular clouds. ... The lines also trace physical conditions such as temperature and density, complementary to mm/sub-mm dust continuum data e.g. ATLASGAL and ALMA continuum. ... Simple molecules (eg. ... More complex molecules (eg. ...

... Luminosity (L) · · · · A source's luminosity is the power that it emits in radiation. ... NB Astronomers often say `flux' when they mean `flux density' · SI units are Wm-2Hz -1 -26 filter · Also used are Jy 10 Wm-2Hz -1 E= РРРF d dA dt Specific Intensity, Surface Brightness (I) · Specific intensity (or surface brightness) is the power received (or emitted) per unit area per unit frequency per unit solid angle. ч F at surface of a spherical source = I · · Specific intensity is independent of distance...

RF/Fiber Optic WDM Transceiver AC231W Features · 2000 MHz Bandwidth · 1.3 or 1.5 µm DFB Low Noise Laser · High Dynamic Range · WDM for bidirectional transmission · Internal Optical Isolator · Monitoring and Alarm Capability · Laser Disable · Singlemode Fiber Description The AC 231W is a linear, low noise RF fiber optic transceiver designed for fiber optic wireless systems and broadband RF applications. ... A laser and received optical power monitor and alarm is provided. ...

Next: Imaging by an Optimizing Method . ... A big advantage of this numerical integrator is its stability: the error in the semi-major axis and the eccentricity depends only on the step size and does not grow with an increasing number of time steps. ... As the integration time increases, the numerical results become more contaminated by various errors. ... A new symplectic integrator produces no secular truncation errors in the actions of a Hamiltonian system. ...

... Spectroscopy of Semiconductors and Dielectrics . ... Interband optical transitions and their optical properties. ... Excitons in crystals. ... Collective interaction effects in exciton and nonequilibrium high-density carrier system. ... Carrier spin and exciton optical orientation in semiconductors. ... Two-dimensional excitons in quantum wells and related quantum systems. €аState density in transverse magnetic field and effect of random potential fluctuation on one-particle spectrum shape. ...

Nonlinear-optical Approach to overcome industrial pollution of space O. Kulagin, I. Gorbunov Institute of Applied Physics Russian Academy of Sciences, N.Novgorod, Russia Space debris threats and application of phase conjugation methods for concentrating the debris illumination · Nearly 90% of orbital debris has dimensions ~ 1-5 cm. ... Space debris illumination concentration by laser point narrowing can be achieved by means of non-linear optical phase conjugation of the debris scattered illumination. ...

... Electric field is a potential heat source for ionospheric particles (Rees, 1989). It is due to the fact that, under the action of an electric field, charged particles drift relative to one another and relative to neutral particles. ... This is called frictional heating. ... However, the effect of frictional/Joule heating of neutrals in the auroral electrojet region can lead to upward neutral wind in a region of high electron densities and strong electric fields (Winser et. al., ...

... Galaxies 99 Cosmic background with model of cloudy interstellar medium Yu. ... Figure 1: Averaged spectrum of the cosmic background I f in frequency range 0.25 200 MHz for the Galactic poles. ... First interpretation of the cosmic noise background spectrum at broad band frequency range 0.25 200 MHz with a model of the cloudy interstellar medium ISM is presented here. ... Synthesized background spectra I f for regions of the Galactic poles at the frequency range 0.25 200 MHz is presented in Fig. ...

... The collecting area is increased by nesting concentric mirror pairs, all having the same focal length. ... Figure shows the largest optical element being ground at HDOS. ... X-ray testing demonstrated that the CXO mirrors are indeed the largest high-resolution X-ray optics ever made; the nominal effective area (based on the ground calibrations) is shown as a function of energy in the left panel of Figure , along with those of their Einstein and ROSAT predecessors. ...

... Figure 10: Mean power spectrum obtained by time-averagi ng the energy map at each duration. For non-periodic signals, the mean wavelet spectrum is similar to the Fourier spectrum. ... The compromise we reached in allowing for single bump localization (something Fourier cannot do) reduces the spectral accuracy. ... Denote by the Fourier transform of the signal, the Fourier transform of the Mexican hat wavelet. ... by which the wavelet transform is a band-pass filtered Fourier Transform. ...

Subject, Problems and Objects of Theoretical Astrophysics. ... Stellar Photospheres, Their Features. ... Physics of Continuous Radiation Absorption in Stellar Photospheres. ... Continuous Radiation Absorption in Stellar Photospheres of Various Spectral Classes. Solar Type Photospheres. ... Characterisics of Absorption Lines. ... Interstellar Absorption Lines, Their Features. ... Physical and Dynamic Features of Interstellar Medium, Which Follows from Observations of Interstellar Absorption Lines. ...