WebThe theoretical period-luminosity relation for Cepheids was deduced from stellar evolution and pulsation computations. Questions concerning the metallicity dependence of the relation as well as the constancy of the pulsation "constant" Q … Webmean temperatures and fundamental periods are used in conjunction with the pulsation equation and stellar models to derive masses, radii, surface gravities, and Mbol of the variables. The stars exhibit a period-luminosity relation. With the aid of HIPPARCOS trigonometric parallaxes the zero point of the Μυ ,
Period-luminosity relationship - The Free Dictionary
WebJan 28, 2003 · The Period-Luminosity relation is useful because it lets you measure the distance to Cepheid stars which are quite far away. Measure the period P of a Cepheid … WebUse the plot of the period-luminosity, or a mathematical equation that represents the fit to the data in the plot, to determine the luminosity of the star. Use the standard flux / luminosity / distance equation to measure … scs programming
Cepheid Variable Stars, Supernovae and Distance Measurement
Webalso satisfy a period-luminosity relation. A Rough Explanation of the Period-Luminosity Relation Cepheids, RR Lyraes, and many other pulsators are found in a narrow and nearly vertical strip in the HR diagram. Thus the effective temperatures of these stars are closely similar and only weakly dependent on luminosity (Teff ≈ 6±1×103 K). We ... http://astro.wku.edu/labs/m100/PLrelation.html Webm - M = 5 log d - 5 rearranged: d = 10 (m-M+5)/5 parsecs to find the distance to the Cepheid: d = 10 (23- (-5.65)+5)/5 parsecs d = 5.4 × 10 6 parsecs Using Type Ia Supernovae … scs promods