Entity magnitude

The entity magnitude is the extinction-corrected apparent brightness of an astronomical object .

To calculate the correction, the brightness is measured at two different wavelengths , since the extinction depends on the wavelength . The entity magnitude is calculated using the following formula, the entity function ,

{\ displaystyle W = MR \ cdot dH}

calculated, and the brightness in a ribbon , a wavelength-dependent constant and the measured brightness difference between the two wavelengths. The entity magnitude is mainly used to increase the accuracy in the extragalactic determination of distance using standard candles , as for example with the Cepheids . ${\ displaystyle M}$ ${\ displaystyle R}$ ${\ displaystyle dH}$

literature

Chow-Choong Ngeow, Shashi M. Kanbur: The linearity of the essence function for the Large Magellanic Cloud Cepheids . In: Monthly Notice of the Royal Astronomical Society . tape 360 , 2005, p. 1033-1039 , doi : 10.1111 / j.1365-2966.2005.09092.x .
D. Majaess, D. Turner, W. Gieren: Concerning the Classical Cepheid VIc Essence Function's Strong Metallicity Dependence . In: The Astrophysical Journal . tape 741 , 2011, pp. L36 , doi : 10.1088 / 2041-8205 / 741/2 / L36 .