What is Standard Candle - Technique?

Standard Candle refers to astronomical object. Its Absolute Magnitude(real magnitude - if we travel to the star) is Known.

They are specifically important to astronomer and researchers because - when their apparent magnitude(As visible - to us from earth) is measured- we can calculate the distance of the start using below formula

m-M = 5 log d – 5

where ,

m refers to apparent magnitude of the object, 

M refers to absolute magnitude of the object, and 

d refers to distance to the object in parsecs.


Important -Standard candles are used to measure those distances(very large ) of stars, which could not be measured using "Parallax Method".

Popularly used standard candles in astronomy are-

1)Cepheid Variable stars

2)RR Lyrae stars

3)Type Ia supernovae (using additional methods)


Learn more from the below links-

https://astronomy.swin.edu.au/cosmos/s/Standard+Candle

http://www.astro.ex.ac.uk/people/hatchell/rinr/candles.pdf

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