The chemical abundance of population I stars a. indicates that ...

[Alygatorr01285]

The chemical abundance of population I stars
 
  a. indicates that they were formed before the population II stars.
  b. indicates that the material they formed from had been enriched with material from supernovae.
  c. indicates that they contain very few heavy metals compared to halo stars.
  d. depends on the temperature of the star.
  e. depends on the mass of the star.

Question 2

How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class?
 
  What will be an ideal response?

[Perkypinki]

Answer to Question 1

b

Answer to Question 2

L star spectra contain bands produced by molecules such as iron hydride. T star spectra show absorption by methane and water vapor. Because these molecules can't exist in high-temperature stars, these objects must be relatively cool.

[Alygatorr01285]

Wow, this really help

[Liddy]

Excellent