Question

An astronomer measures the apparent brightnesses (i.e. flux, or Watts/m^2) of Star A and Star B...

An astronomer measures the apparent brightnesses (i.e. flux, or Watts/m^2) of Star A and Star B to be identical. At the same time, the astronomer measures the parallax (in arcseconds) of Star A to be 5 times larger than that of Star B.

(a) Which star is further away? Express the distance to Star B in terms of the distance to Star A.

(b) Which star has a greater luminosity? Express the luminosity of Star B in terms of the luminosity of Star A.

Science   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
) 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...
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...
2. If star A and star B have the same apparent magnitude, then it must be...
2. If star A and star B have the same apparent magnitude, then it must be true that a. star A and star B are the distance from Earth. b. star A and star B also have the same absolute magnitude. c. star A and star B are of the same spectral type. d. none of the above. 6. We can see from the H-R diagram that cool stars tend to be a. bright b . faint c. large d....
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...
In the following problem you will calculate various properties of a star in order to ultimately...
In the following problem you will calculate various properties of a star in order to ultimately determine the radius of an exoplanet which transits that star. The nearby star has a parallax angle of 0.6 arcseconds. B. Our sun is measured to be 2.3 × 1010 brighter than this star. Determine the luminosity (L) of the star relative to the sun's luminosity (LSun) (i.e., determine L/LSun) (1 AU = 4.848 × 10-6 parsecs and (L/LSun)= (B/BSun) * (D/DSun), where B...
1. The visible region of the sun is known as a. corona b. photosphere c. radiation...
1. The visible region of the sun is known as a. corona b. photosphere c. radiation zone d. chromosphere 2. The average temperature of that part of the sun, which we see, is (a) 6000 k (b) 60,000 k (c) 600 k (d) 15 million k 3. Granulation of the sun is caused by a. sunspots b. prominences c. convection d. radiation 4. Convection zone is located a. next to the core b. between radiation zone and photosphere c. between...
Exercises 1. How is the image formed by the mirror different from the lenses ? Exercises:...
Exercises 1. How is the image formed by the mirror different from the lenses ? Exercises: Problem Solving 1. The focal point is found 20 cm from a double concave lens where an object is placed 12 cm. Find the image distance.?? 2- A 2.8 cm diameter coin is placed 25 cm from a double concave lens with focal length of -12 cm. Find the image distance and diameter of the image?? 3. An object that is 8 cm high...
3/ which of the following stellar properties is the most fundamental to a star’s main-sequence and...
3/ which of the following stellar properties is the most fundamental to a star’s main-sequence and post-main sequence life? A/ temperature B/ mass C/ luminosity D/ radius 4/ Stars Moppit and Boppit orbit each other as members of a binary star system. Their period of rotation about their combined centre of mass is 10 years. The semi-major axis of Boppit’s orbit around the centre of mass is 15.25 AU. What is the combined mass of Moppit and Boppit? A/ Mmoppit...
1.) You will work with 0.10 M acetic acid and 17 M acetic acid in this...
1.) You will work with 0.10 M acetic acid and 17 M acetic acid in this experiment. What is the relationship between concentration and ionization? Explain the reason for this relationship 2.) Explain hydrolysis, i.e, what types of molecules undergo hydrolysis (be specific) and show equations for reactions of acid, base, and salt hydrolysis not used as examples in the introduction to this experiment 3.) In Part C: Hydrolysis of Salts, you will calibrate the pH probe prior to testing...
2. SECURING THE WORKFORCE Diversity management in X-tech, a Japanese organisation This case is intended to...
2. SECURING THE WORKFORCE Diversity management in X-tech, a Japanese organisation This case is intended to be used as a basis for class discussion rather than as an illustration of the effective or ineffective handling of an administrative situation. The name of the company is disguised. INTRODUCTION In light of demographic concerns, in 2012, the Japanese government initiated an effort to change the work environment in order to secure the workforce of the future. Japan is world renowned for its...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT