... 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. ...

... One Jansky (Jy) is defined as 10 -26 Wm -2 Hz -1 , so it is a unit of measurement of the spectral flux density, F . ... 3x10 -12 . ... erg sec -1 cm -2 ?m -1 . ... where m is the magnitude and F o the zero-point flux for the given photometric band. ... Surface brightnesses are generally measured in Janskys arcsec -2 , MJy steradian -1 or magnitudes arcsec -2 . If you have a surface brightness S in MJy steradian -1 , then you can use: S [Jy arcsec -2 ] = S [MJy ster -1 ] x 0.084616. ...

. 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

Effective Area Analysis using the Chandra HETGS Herman L. Marshall Chandra X-ray Center (MIT) Chandra Effective Area Herman Marshall (MIT CXC) Mallorca Feb. ... 05 13 HETGS Residuals after fixing Ir-M edge Chandra Effective Area Herman Marshall (MIT CXC) Mallorca Feb. ... 05 23 ACIS OBF HETG Efficiency HRMA Effective Area Chandra Effective Area HRMA Ir-M edge · · · Jump is about 10% MEG and HEG agree See Diab Jerius' talk Chandra Effective Area Herman Marshall (MIT CXC) Mallorca Feb. ...

... Energetic magnetospheric ions are often unstable to the electromagnetic ion cyclotron (EMIC) instability . ... generation of EMIC waves below the proton gyrofrequency , and . ... Depending on the local proton gyrofrequency, the frequency of the EMIC waves varies: in the magnetosphere we deal with the ULF range (more precisely 0.1-5 Hz), while in the auroral field lines we have ELF waves (tens or hundreds of Hz; see radio frequencies and flickering aurora ). ... Space Physics Text Book of Oulu ...

... 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) . ...

The night after the John Glenn program, I pitched the terraforming idea to my students. I asked them if they'd like to terraform Mars as a big class project; I wanted to throw the idea to them and see how they would react. Already I had a vision of splitting the class into several groups and having each group take charge of a portion of the project. ... Following my initial idea on how to conduct the project, I split the class into six groups, each student choosing his or her group. ...

Fast interstellar scintillation of quasars, and PKS 1257-326 revisited Hayley Bignall ICRAR - Curtin University 3 well-studied "extreme" scintillating quasars 8.6 GHz 4.9 GHz: weak scattering 4.8 GHz 2.3 GHz 1.4 GHz PKS 0405-385 ­ ATCA (Kedziora-Chudczer et al. 1997, ApJL, 490, L9) 1.4 GHz: strong scattering (refractive scintillation) J1819+3845 - WSRT (Dennett-Thorpe & de Bruyn, 2000, ApJL, 529, L65) PKS 1257-326 - ATCA (Bignall et al. ... Also need to consider source size effects (>F; ~1/?) ...

Next: Other People's Software . ... Quality system management of computer workstations for astronomy can be achieved with relatively small manpower requirements, if the right cost-effective administrative design decisions are made. ... This is all done with essentially one system manager. ... The system is designed so that one doesn't depend on four or more hosts, (such as a software server, cpu server, data file server, font server, etc.) to get work done. ...

Note from Robert Nemiroff, an author and editor of Astronomy Picture of the Day (APOD): . I have accepted a faculty position in the Department of Physics of Michigan Technological University (MTU). ... It is hoped that this will have little effect on APOD - both authoring and editing duties should remain effectively unchanged. Work will be done towards opening a complementary mirror APOD site at MTU within the next few months. ...

The efficiency of interaction of radiation with a particle and hence its optical properties depend on the particle chemical composition, size, shape, structure, etc. ... Particle size expressed in units of the wavelength of incident radiation, together with chemical composition, most strongly affects the optical properties of a scatterer. ... There are many methods to solve the light-scattering problem for a homogeneous spheroid (our survey of the light-scattering methods see here ). ...

product manual for pulse profiling application: specs pg 8 freq range: 100Mhz to 8Ghz ; calibration factor .. about 4% linearity 3% to 7% depending on input power noise: 1 sec integration: 100Mhz to 6Ghz .02% .02% -30 to +20 dbm .04% -50 to -30 dbm ; video bandwidth power measurements: 10Mhz pulse profiling : 100 Khz pulse profiling opt4 : 100 Khz,200khz,.. ... As baseband approaches the Nyquist criteria (realistically about 200 Khz) problems arise.. ...

Detector of hydrogen isotopes (ISIV) . ... Measurements of hydrogen isotopes content in surface layer of a solid (provided that the content is more than 0.01 %). ... Content of hydrogen isotopes of a sample is measured by nondestructive technique of direct measurements in the surface layer. ... Measurable hydrogen isotopes content   ~0.01 wt. ... Area surface of sample                                         ~10 cm 2 . ... G. Dolnikov +7(495)333-25-66, ggd@iki.rssi.ru . ...

Effect of chromospheric activity on the mean colours of late­type stars P. Amado and P.B. Byrne A&A, accepted July 96 In this paper we show, for the first time, the effect of activity on the (U \Gamma B) o vs. B \Gamma V ) o colour­colour diagram for a large sample of late type stars. we clearly see that for single­lined spectroscopic RS CVn systems there exists an ultraviolet excess over that recorded for quiescent stars of the same spectral type. ...

Peremennye Zvezdy", . ... 7, N 29 (2007) . ... GSC 2050-00745 . ... RRAB, Blazhko effect; . ... 127 V-band brightness measurements were obtained on two nights in 2006: July 25 - 26, JD2453942-43; and 218 measurements, on three nights in 2007: July 11 - 16, JD2454293-98. ... The phased light curve is given in the Figure. ... The phased light curves for four seasons of observations: 2004 (July 5 - 28) - violet; 2005 (June 30 - July 20) - orange; 2006 (July 25 - 26) - green; 2007 (July 11 - 16) - blue. ...

Is the ozone layer recovering ? ... Global Regulation Global Regulation · · · · 1985: Vienna Convention 1987: Montreal Protocol Several amendments and adjustments Quantity for (chemical) ozone depletion of ODS: EESC (Equivalent Effective qu ect Stratospheric Chlorine): Weighting over release and ozone depletion of individual ODS EESC for mid-latitudes http//:www.wmo.ch/web/arep/reports/ozone_2002/q&as.pdf, Seite Q.29 1980 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100 3. ...

... I have compiled a list of throughput filter curves from a variety of telescopes, instruments, and surveys. Click on the name of the filter to download it. The first line of each filter is the zeropoint for that filter. If the filter is in the AB system, it is listed as 0.0 (or in otherwords -48.55). ... Filter . Effective Wavelength . ... A_V . ... 0.987 . ... 0.050 . ...

The Yarkovsky Effect in the Motion of NEAs . ... In this paper we evaluate the Yarkovsky effect on the motion of NEAs under the assumption that this acceleration depends on heliocentric distance as 1/r 2 and is characterized by the transverse component 2 in the orbital coordinate system. ... In some instances the Yarkovsky effect can be estimated by using only optical observations. Accounting for the Yarkovsky effect permits to include more optical observations in the orbit fitting process. ...

Short Notes phys. stat. sol. (a) K2 1 K21 (1975) 27, Subject classification: 18.2: 21.1; 21.1.1 Solid State Physics Institute, Academy of Sciences of the USSR, Chernogolovka The Effect of Pressure on the Curie Points of Fe-Ni-Cu and Fe-Ni-Mn Alloys BY V.E. ANTONOV, G.T. DUBOVKA, and E.G. PONYATOVSKII There is a series of papers on the effect of pressure on the Curie points T of C Fe alloys with other transition elements. ... The dependence of the Curie points on pressure is linear. ... 1 Fig. ...

. 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.