How does standard candle work?


by hobobobo
Tags: candle, standard, work
hobobobo
hobobobo is offline
#1
Apr17-08, 04:27 PM
P: 40
I'm kinda confused about how standard candle works. I know they use type 1 supernovae since their luminosity is the same everywhere but how do scientists know how far a star is if their luminosity is the same everywhere. I don't really get how they measure distance with it. Can someone please explain to me! thanx^^
Phys.Org News Partner Space news on Phys.org
Unique pair of supermassive black holes in an ordinary galaxy discovered
How far are the planets from the Sun?
Previewing the bizzare April 29th solar eclipse
Janus
Janus is offline
#2
Apr17-08, 05:04 PM
Emeritus
Sci Advisor
PF Gold
Janus's Avatar
P: 2,352
If the luminosity of two objects are the same they will appear to be equally bright when viewed from a equal distance. They will not appear to be equally bright when viewed from different distances. Thus if we see two type 1 supernovae, and one is brighter than the other, we know that it is closer to us than the other. And by how much brighter we can tell how much nearer it is.
Nabeshin
Nabeshin is offline
#3
Apr17-08, 05:13 PM
Sci Advisor
Nabeshin's Avatar
P: 2,194
I think that scientists can infer that all type I supernova have about the same luminosity because of the physics behind this specific type of supernova. I believe it only occurs with a certain mass of star, so the explosions are relatively the same intensity for all of them. The other half is what Janus said :)

hobobobo
hobobobo is offline
#4
Apr17-08, 05:28 PM
P: 40

How does standard candle work?


hmmmm I see because I was confused of luminosity and brightness like the difference from those two.


Register to reply

Related Discussions
Mystery of Candle Wax General Physics 2
Candle Problem Introductory Physics Homework 6
Candle in a lift General Physics 8
Ice melting because of a candle burning? Introductory Physics Homework 4
inverted candle General Physics 9