Why would an eclipsing binary be more valuable than an ordinary spectroscopic bi

Question

Why would an eclipsing binary be more valuable than an ordinary spectroscopic binary in accurately determining stellar parameters? (Hint: Consider the spectroscopic information here.)

Describe three differences in the p-p chain and CNO cycle for converting H into He in main sequence stars.

Explain why type Ia supernovae are favoured for determining distances to galaxies, how they could be distinguished from type II supernovae, and explain at least one drawback in their use as standard candles.

List three observations that suggest that much of the matter in the universe is “dark.”

Explain differential rotation of the galaxy and how it affects observations of the spectra of stars in the galaxy relative to an observer on Earth.

Why can’t an isolated white dwarf contract as it cools? What is its fate?

Explanation / Answer

Answer-

1.eclipsing binary are more important because of their typical geometrical layout and well understood physics. It is used to determine the physical characteristics of double stars which gives a detailed information of evolution of stars.

2.At temperature 18000000K ,below this temperature the CNO cycle releases less energy than ppo reaction,whereas above this temperature,CNO reaction releases more energy then PPO cycle.

3. three observations are as follows-

-galaxy clusters(where the luminous masses are not enough to hold them and hence the term dark matter introduced).

-galactic rotation curves.

-the cosmic microwave background.

6. An isolated white dwarf does not contracts as it cools because because it is made up of degenerate matter as a result of which it cools down and become cold dark dwarfs.

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