Register to reply

Surface brightness to luminosity

by Warimi
Tags: brightness, luminosity, surface
Share this thread:
Warimi
#1
Dec8-12, 06:39 PM
P: 1
Can anyone offer insight into the derivation of the surface brightness to solar luminosity conversion

S(mag/arcsec^2) = Mabs + 21.572 - 2.5log S (Solar luminosities/pc^2)

More or less my concern is the constant term, is it empirically observed value or is there a derivation for it?

thanks
Phys.Org News Partner Astronomy news on Phys.org
A new approach in the search for extraterrestrial intelligence: targeting alien polluters
Lives and deaths of sibling stars
Australian researchers pioneer a 'Google street view' of galaxies
mfb
#2
Dec9-12, 09:45 AM
Mentor
P: 11,576
The definition of magnitude and parsec are arbitrary, and if you take the log of those (multiplicative) constants and add everything you should get 21.572 in some way.


Register to reply

Related Discussions
Computing luminosity from surface brightness Introductory Physics Homework 0
Tolman Surface Brightness Test - need help! Cosmology 10
Tolman surface brightness test - need help! Astronomy & Astrophysics 3
Surface brightness Advanced Physics Homework 9
Inverse square law....intensity-brightness-luminosity-distance General Physics 1