The following table gives approximate values of effective temperatures, bolometric corrections, and color indices of stars of various spectral types:. The following table gives approximate values of effective temperatures, bolometric corrections, and color indices of stars of various spectral types:. The solar constant (GSC) measures the amount of energy received by a given area one astronomical unit away from the Sun. More specifically, it is a flux density measuring mean solar electromagnetic radiation (total solar irradiance) per unit area. It is measured on a surface perpendicular to the. . A parallax is an angle at which the radius of earth's orbit around the sun is seen from a distance of the star. 06 × 105 is the number of seconds of arc in 1 radian. 4 × 1028cm ≈ 4 Gpc = Hubble distance, where H0 ≈ 70 km s−1 Mpc−1 is the. . 00 by D. Physical c nstants are from Ref. While every e ort has been made to obtain the most accurate current values of the listed quantities, the table does not. . n s n cos. The blue region is from a model that is based on observations of stars such as the Sun, and the purple region is based on the effect of the solar magnetic flux on bright regions called faculae.
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