Question

Two main sequence stars appear equally bright in the night sky. Star P has a spectral...

Two main sequence stars appear equally bright in the night sky. Star P has a spectral class of M2 and Star Q has a spectral class of B8. Explain your answers.

  1. Which is cooler?
  2. Which has a greater absolute magnitude?
  3. Which emits more energy per unit surface area?
  4. Which is closer to the observer?
Science   Advanced-Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Consider a star cluster that starts out with main sequence stars of spectral type O, B,...
Consider a star cluster that starts out with main sequence stars of spectral type O, B, A, F, G, K, M. Explain which spectral types will be present when the cluster is 108 years old. Explain which will be present when it is 1010 years old. (Note: Review the slide in the "Stars" lecture that shows the lifetimes of stars on different parts of the HR diagram to help you answer this question)
Consider a star cluster that starts out with main sequence stars of spectral type O, B,...
Consider a star cluster that starts out with main sequence stars of spectral type O, B, A, F, G, K, M. Explain which spectral types will be present when the cluster is 108 years old. Explain which will be present when it is 1010 years old. (Note: Review the slide in the "Stars" lecture that shows the lifetimes of stars on different parts of the HR diagram to help you answer this question)
) Canopus (alpha Carinae) is the second-brightest star in the night sky, its apparent magnitude is...
) Canopus (alpha Carinae) is the second-brightest star in the night sky, its apparent magnitude is 0.7 m . Based on the parallax measurements of Hipparcos satellite, its parallax is approximately 0.01 arcseconds. (i) Find the distance to Canopus in parsecs and its absolute magnitude. [3 marks] (ii) Assuming that the absolute magnitude of the Sun is 4.8m show that the luminosity of Canopus in terms of the solar luminosity L⊙ is approximately 16000 L⊙. [2 marks] (iii) The emission...
The approximate main-sequence lifetime of a star of spectral type O is 3 million years. When...
The approximate main-sequence lifetime of a star of spectral type O is 3 million years. When you observe an O star in a galaxy it is safe to conclude that ______________ A) the main-sequence of that O star ended several billion years ago. B) new stars formed in that galaxy in the recent past. C) the galaxy is flooded by infrared photons. D) there are no white dwarfs in that galaxy. E) the galaxy must be closer than 3 million...
Which of the following is closest to the distance from Earth to a star having an...
Which of the following is closest to the distance from Earth to a star having an Absolute Magnitude of -1 and an apparent Magnitude of 2.5 ? Question 18 options: 150 parsecs 100 parsecs 50 parsecs 25 parsecs Question 13 (1 point) Saved Which of the following is closest to the Absolute Magnitude of a star having a luminosity of 150 times the luminosity of the Sun ? Question 13 options: 0.0 -1.0 1.0 -2.0 Question 14 (1 point) Saved...
1/ Alpha Centauri A is a star that is remarkably like our Sun...indeed, we can think...
1/ Alpha Centauri A is a star that is remarkably like our Sun...indeed, we can think of it as the Sun’s stellar twin. Alpha Centauri A lies at a distence of 4.4 light-years from Earth, and it has a luminosity of 5.88 x 10^26 W. Calculate the apparent brightness of Alpha Centauri A Suppose you have a light bulb that emits 100 W of visible light. How far away from you would you need to put that light bulb in...
If a stars absolute magnitude is numerically equal to its apparent magnitude, what do we know...
If a stars absolute magnitude is numerically equal to its apparent magnitude, what do we know about the star? A. It is 1 parsec from us. B. It is 10 parsecs from us. C. It is 1 light year from us. D. The star is a main sequence star. E. [The question is misleading; it is impossible for the two magnitudes to be equal.] ----------------------------------------- A star has an apparent magnitude of 6.5 and an absolute magnitude of 4. Ignoring...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT