binary stars apparent and absolute magnitudes...


by cpives
Tags: absolute, apparent, binary, magnitudes, stars
cpives
cpives is offline
#1
Nov20-11, 09:10 AM
P: 1
1. The problem statement, all variables and given/known data
A binary star system has two star of equal luminosity. The apparent magnitude of the two stars together is 11.2, and they are at a distance is 76pcs. How do I work out the apparent and absolute magnitudes of just one star?


2. Relevant equations

m=-2.5log(L)

m-M=5log(d)-5

M=-2.5log(L/Lsun)+4.8



3. The attempt at a solution

luminosities can be added, I know that much.
Phys.Org News Partner Science news on Phys.org
Better thermal-imaging lens from waste sulfur
Hackathon team's GoogolPlex gives Siri extra powers
Bright points in Sun's atmosphere mark patterns deep in its interior
phyzguy
phyzguy is offline
#2
Nov20-11, 10:18 AM
P: 2,068
So given that the luminosities can be added, if the luminosity of each start is L, what is the luminosity of the system? Then, using your first equation, knowing the apparent magnitude of the system, what is the apparent magnitude of each star?


Register to reply

Related Discussions
Calculating distance using absolute and apparent visual magnitudes Astrophysics 1
Astrophysics - Apparent Magnitude of stars in a close binary system Introductory Physics Homework 1
Astronomy Physics - Apparent Magnitudes Advanced Physics Homework 1
Question on binary stars & binary stars Introductory Physics Homework 1