A one solar mass star has a luminosity of one solar luminosity.
Show your work in answering these three questions:
b) the main sequence lifetime of a star is essentially its Mass (M) divided by its rate of fuel burn, which is its Luminosity (L). Hence lifetime = M/L. For a 1 solar mass star M/L = 1.
Calculate M/L for a 2 solar mass star and for a 0.5 solar Mass Star.
c) if the main sequence lifetime of a 1 solar mass star is 1 billion years, what is the lifetime of a 2 solar mass star and what is the lifetime of a 0.5 solar mass star.
In this exercise, you will be measuring the equivalent widths of absorption lines in real spectra of real stars.
Before using the simulation , please refer to this YouTube Tutorial
If you DO NOT DO USE THIS TUTORIAL, you will likely be lost
Fire up the simulation and make the measurements
Comparing the Hydrogen Line Strength of two stars.
Submit screen shots of both of your measurements (a and b below) for this exercise
a) From the list under step 1 choose the star type labelled A5-7V and measure the equivalent width of the Hydrogen line at 4860 angstroms.
b) Now make the same measurement of the star G8IV
c) why was the measurement more difficult for the G8IV star?
There are 31 stars in this cluster. Extremely blue stars would be much brighter in the blue frame than the red frame where as extremely red stars would be much brighter in the red frame than the blue frame.
Compare the Red and Blue frames linked below and identify, by their star number, the three bluest and three reddest stars in this cluster. Select an exposure time of 30 seconds for both the red and blue frames.