Sirius appears bright because of both its intrinsic luminosity and its proximity to Earth.
2.
Sirius appears bright due to both its intrinsic luminosity and its closeness to the Earth.
3.
This measurement was based primarily on observations of Cepheid stars, objects of known intrinsic luminosity that have acted as cosmic mileposts this century.
4.
In astronomy, the "'Tully Fisher relation "'is an empirical relationship between the mass or intrinsic luminosity of a spiral galaxy and its angular velocity or emission line width.
5.
After further study, she confirmed in 1912 that the Cepheid variables with greater intrinsic luminosity did have longer periods, and that the relationship was quite close and predictable.
6.
The accretion explains all peculiar properties of classical T Tauri stars : strong flux in the emission lines ( up to 100 % of the intrinsic luminosity of the star ), magnetic activity, weakly lined T Tauri star, which, over hundreds of millions of years, evolves into an ordinary Sun-like star, dependent on its initial mass.
7.
If the intrinsic luminosity L of a distant object is known, we can calculate its luminosity distance by measuring the flux S and determine d _ L ( z ) = \ sqrt { L / 4 \ pi S }, which turns out to be equivalent to the expression above for d _ L ( z ).
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