For example a star of luminosity L emits N photon packets each with energy ϵ=LΔt/N for an experiment of duration Δt. Each photon packet has a frequency associated with it and since each packet has the same energy, photon packets with different frequencies have different numbers of ...
The Survey for Ionization in Neutral Gas Galaxies- II. The Star Formation Rate Density of the Local Universe We derive observed Halpha and R band luminosity densities of an HI-selected sample of nearby galaxies using the SINGG sample to be l_Halpha' = (9.4 +/- 1.8......
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For each chemical composition and log g, we compute more than 26 model atmospheres with various luminosities relative to the Eddington luminosity L_Edd computed for the Thomson cross-section. The maximum relative luminosities L/L_Edd reach values of up to 1.1 for high gravity models. The ...
Also, from rotational phase-resolved spectroscopy, we have for the first time determined the compactness (mass/radius) of the M7 NS RBS1223. If also applied to RXJ1856, radius (from luminosity and temperature) and compactness (from X-ray data) will yield the mass and radius - for the ...
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of energy, in joules (J) per second, emitted from one square meter of an object's surface, and by that definition, it's obviously related to the total amount of energy a star radiates in one second, known more formally as luminosity, as well as surface area.Read Wien's Law vs. ...
For each chemical composition and log g, we compute more than 26 model atmospheres with various luminosities relative to the Eddington luminosity L_Edd computed for the Thomson cross-section. The maximum relative luminosities L/L_Edd reach values of up to 1.1 for high gravity models. The ...
The luminosity of a star with a radius of (7.60x10^6) meters and a surface temperature of 30,000 Kelvin is ... Watts. If a system has 3.5 x 10^2 Kcal of work done to it, and releases 5.00 x10^2 kJ of heat into its ...
There are a few ways to find planets orbiting other stars, the most successful of which involve having an edge-on view of the star. You can measure theDoppler shiftof the star as it oscillates towards you and away from you, you can measure the dip in luminosity as a planet passes in ...