. Next: Diameters Up: Stellar parameters from calibrations Previous: Gravities Contents . Temperatures of stars are derived from their spectral type and luminosity class. Calibrations are stored in files spec_par.V, spec_par.IV, spec_par.III, spec_par.II, spec_par.I in oyster/starbase . teff_stars Compute effective temperature for all stars in startable. teff_star ( spectrum _char ) Function. Return effective temperature for star with specified spectrum. Christian Hummel 2015-04-28

... We present an analysis of an optical blue spectrum of the pulsating helium star V652 Her (=BD+13 3224$) in order to determine its effective temperature, surface gravity and chemical composition. ... The surface composition is characterised by abundances of nH=0.009, He=0.988, nC~0.000040, nN=0.0025 and nO=0.00010 (number fractions). ... If V652 Her was formed by the merger of two white dwarfs, its surface composition demands that they should both be helium white dwarfs. ...

A stellar library of synthetic spectra of H Balmer and HeI absorption lines . ... The grid includes the profiles of the high-order hydrogen Balmer series and HeI lines for effective temperatures and gravities that have not been previously synthesized. ... The main spectral lines synthesized are: . ... H 13 , H 12 , H 11 , H 10 , HeI 3819, H 9 , H 8 . ... that contains the following eight files with the values for the Balmer lines (H b , H d and H8) and HeI lines (3819, 4026, 4388, 4471 and 4922): . ...

Next: Antenna gain considerations and Up: Some Theory Previous: Polarisation . To provide correct flux density units for the visibilities, , from an interferometer, the measured correlation coefficient at the correlator ( ) needs to be scaled by a system temperature and a telescope sensitivity factor ( ). ... For a zenith opacity , observing at an elevation of , and if the atmosphere is approximated as having a uniform temperature , then the atmospheric contribution to system temperature is . ...

... We present a computer program for modelling energy flux distribution and light curves of eclipsing binaries from far ultraviolet to infrared regions. The Roche model is assumed. Proximity effects of components (reflection of radiation and surface gravity darkening) are taken into account. ... Figure 1: The surface temperature distribution for Algol A-B system before (upper plot) and after (lower plot) correction for temperature due to the irradiation effect. ...

XMM ­Newton CCF Release Note XMM ­ CCF ­REL­1 Effective area of the X­ray telescopes P. Gondoin October 4, 2000 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag XRT1 XAREAEF 0006 2000 ­01­13T00:00:00 ONAXISXAREAEF, VIGNETTING Cal 3.80, xmm ­ sas 20000903 1900 NO XRT2 XAREAEF 0007 2000 ­01­13T00:00:00 ONAXISXAREAEF, VIGNETTING Cal 3.80, ... 3 Scientific Impact of this Update This update has no impact on on­axis the effective area accuracy. ...

Magnetic stars, 2004, 212-215 Averaged stellar effective magnetic fields. ... The catalog is based on 12076 measurements of the stellar effective (or mean longitudinal) magnetic field strengths Be , which were compiled from the available literature. ... The first measurements of magnetic fields in stars were made more than 50 years ago (Babcock & Burd 1952). Since that time, both the number of magnetic field measurements and the number of investigated stars have grown enormously. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 January 22 . Neutron Bounce Quantized in Earth Gravity . ... Explanation: For the first time, Earth's gravity has been used to isolate quantum energy levels of the neutron. The effect may be used in the future to test for slightly different effects of gravity on neutrally charged particles of different mass . ... About APOD | ...

TOWARDS SUPERSENSITIVE BOLOMETERS AND ELECTRON COOLERS BASED ON CARBON NANOTUBES M.TARASOV, J.SVENSSON, S.DITTMER, L.KUZMIN, AND E.CAMPBELL Chalmers University of Technology, GЖteborg SE 41294, Sweden E-mail: Mikhail.tarasov@mc2.chalmers.se Carbon nanotubes (CNT) are being intensively developed for novel electronics. Electron cooling by superconductor-insulator-nanotube (SIN) tunnel junctions could be extremely effective due to the small volume of the CNT. ...

Galileo showed convincingly that heavy objects fell no faster that light ones. ... If an iron ball was pulled down with a much greater force than a wooden one of the same size, why didn't it fall any faster? ... 1) It is harder to lift. ... It is the fact that the loaded wagon has a greater mass that gives it a larger inertia , a larger tendency to oppose any change in its state of rest or of constant motion in a straight line. ... One important quantity was the body mass of the astronauts. ...

Chair of solid state physics . ... Physics of Semiconductors . ... The electron mean free time. ... The dispersion of electrons and holes. ... The mean values of the velocity and acceleration of the electron, the electrons and holes in a magnetic field (the classical theory), the diamagnetic resonance. ... The energy spectrum of electrons and holes in a magnetic field (quantum theory), the energy spectrum of electrons and holes in a constant electric field (quantum theory), shallow impurity levels. ...

Astronomy Picture of the Day . Gravity Probe B Confirms the Existence of Gravitomagnetism . ... 10.05.2011 . ... Credit Copyright: Gravity Probe B Team, Stanford , NASA Explanation: Does gravity have a magnetic counterpart? Spin any electric charge and you get a magnetic field. ... In a bold attempt to directly measure gravitomagnetism , NASA launched in 2004 the smoothest spheres ever manufactured into space to see how they spin . ... Publications with keywords: gravity - gravity Probe B . ...

... Assured of a reliable method of solving the normal equations, we now consider the equations of condition. The observed magnitude m of a star at M air masses with true instrumental magnitude is modelled as ([ 10 ], [ 28 ]) . ... The effective extinction coefficient depends on the effective spectral gradient [ 29 ] of the star, for which we use some color index, affected by half the atmospheric reddening ([ 26 ], [ 10 ]): . ... Thus, for the B band of UBV, we use the (U-V) color. ...

As the Universe expands, gravity pulls on the Universe, and slows the expansion down over time. As we look to great distances, we are looking back in time. If we can measure how fast the Universe is expanding in the past, and compare it to how fast it is expanding now, we can see the total gravitational effect of all matter in the Universe. Here we plot the distance between two galaxies as a function of time. ... Universes with lots of material . ...

Gravitational wave contribution to CMBR anisotropy V.N. Lukash 1 and E.V. Mikheeva 2 Astro Space Center of P.N.Lebedev Physical Institute 3 , Profsoyuznaya 84/32, Moscow 117810, Russia We argue that the contribution of cosmic gravitational waves into the large­scale CMBR anisotropy can exceed 50% for a broad class of the inflationary models with effective \Lambda­term producing the standard local spectrum of primordial cosmological perturbations. ... 10 7 k hor (Figure 2). ...

КАТАЛОГ ВОЗРАСТОВ, МЕТАЛЛИЧНОСТЕЙ, ЭЛЕМЕНТОВ ОРБИТ И ДРУГИХ ПАРАМЕТРОВ БЛИЗКИХ F-ЗВЕЗД . ... В. Марсаков, Ю. Шевелев . ... Подробнее о методах вычисления возрастов и элементов орбит звезд см. в работах Марсаков & Шевелев (1993) и Марсаков & Шевелев (1994). ... A & A, 22, 255 // Первая цитата в статье . ... Первая цитата в статье . ... Марсаков В.А. & Шевелев Ю.Г. 1993, АЖ, 70,1218 // Первая цитата в статье . Марсков В.А. & Шевелев Ю.Г. 1994, АЖ, 71, 368 // Первая цитата в статье . ...

. This Directory contains Model of distribution of density, temperature and effective collision freguency of electrons. Yu.K.Chasovitin. 1998. This Directory contains The program RIM98 for calculating the parameters of the ionosphere to use the "Reference Ionospheric Model-98" (RIM-98).Yu.K.Chasovitin. 1998.

Previous page: Measuring temperatures and composition in the ionoshere . If the actual spectra that the radar measures from the ionosphere consisted of continuous smooth curves, and if it was necessary to measure only two quantities, say the width and the total power, then one could use a ruler and get pretty good answers. ... There is no simple way to get from the data points to the best answers, but one would say that one spectrum is much better than the other. ...

... Posts tagged ?effective area? ... highlighting some equation that is widely used in astrophysics or astrostatistics. ... Tags: ARF , effective area , EotW , Equation , Equation of the Week , LRF , point spread function , PSF , response matrix , RMF , source . ... Comment . ... Entries RSS . Comments RSS . ... vlk on [MADS] Parallel Coordinates . upvc windows on [MADS] Parallel Coordinates . ... Alfred Inselberg on [MADS] Parallel Coordinates . ... Entries (RSS) and Comments (RSS) . ...

NASA JOHNSON SPACE CENTER ORAL HISTORY PROJECT BIOGRAPHICAL DATA SHEET NAME: Jack Funk O RAL H ISTORY: 30 October 2003 5 November 2003 EDUCATIONAL BACKGROUND: B.S. in Aeronautical Engineering, 1943 PRE- NASA EXPERIENCE: NACA, Langley Aeronautical Laboratory, Langley Field , VA (1943-1958) · Aeronautical Engineer, Aircraft Aerodynamic Loads (1943-1958) NASA EXPERIENCE: NASA Space Task Group, ...