Question

1) Textbook Review Question (2 pt.) What is the most basic method of determining stellar distances? EXPLAIN the method!

2) Textbook Review Question (2 pt.) Explain the difference between a star’s apparent and absolute magnitudes. Which one is an intrinsic property of a star?

3) Textbook/Lecture Review Question (2 pt.) What information about a star can be determined from its color? Give an example.

4) Textbook Review Question (8 pt.) Enumerate in as much detail as you can, the steps thought to be involved in the evolution of Sun-like stars. Include in your answer: • What is meant by being on the main sequence? • What triggers the end of the main sequence? • How do the “lives” of the most massive stars end and what are the two possible products of this event?

5) Textbook Review Question (2 pt.) How do we know that the materials in our solar system are from the death of a star larger than out Sun?

Answer 1

1 The most basic method of determine stellar distance is to use stellar parallax of.It is the apparent shift of position of any nearby star against the background of distance objects.

2 stars apparent magnitude difines how bright the star appears from Earth and absolute magnitude defines how bright the star appears at a standard distance of 32.6 light years.

3 Temperature, the hotter the star the more blue it is the cooler the star the more red it is.

4 while nuclear fusion continue the interior change as hydrogen is depled meanwhile helium takes it place .the star temp drops andendup with a radius 3x the radius of sun the star then begins to fuse remaining hydrogen into helium.helium begins to burn in the core then He 4 nuclei are transformed into C by triple alpha process.The AGB branch star will appear as a bright red giant with a luminousity 1000times of sun

5 after the life time of a star either it will form as a black hole or either it with bombard out or burns out