v CorrectPart CWhich has a greater luminosity, a star with absolute magnitude -2 or a star with absolute magnitude 8 ?O A star with absolute magnitude 8.A star with absolute magnitude -2.SubmitPrevious AnswersCorrectPart DBy how much?LM=-2LM-8000000001SubmitPrevious Answers Request AnswerX Incorrect; Try Again; 5 attempts remainingNext >Provide FeedbackP Pearson8:58 PM(cp ツ4/2/202earson Education Inc. All rights reserved. | Terms of Use Privacy Policy Permissions Contact Us |49°F Sunny

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Answered: Part D By how much? ΑΣΦ LM=-2 100000000…

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Part D By how much? ΑΣΦ LM=-2 100000000 %3D LM=8 Submit Previous Answers Request Answer

Stars and Galaxies (MindTap Course List)

10th Edition

ISBN:9781337399944

Author:Michael A. Seeds

Publisher:Michael A. Seeds

Chapter12: Stellar Evolution

Section: Chapter Questions

Problem 7P

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A star with a radius 1.7 times that of the Sun has a surface temperature T=10,000 K. Calculate the luminosity of this star and express your answer in units of the Solar luminosity (the Solar luminosity = 3.84 x 1026 W and the Solar radius = 7 x %3D 108 m). Choose the option below that most closely matches your answer. Select one: а. 20 O b. 100. O C. 26. O d. 5. O e. 1000
Q9. If the luminosity of star B is 25 times the luminosity of star A, then find the distance of star A if you know that the two stars have the same brightness, and that star B is 10 astronomical leagues away from us. Use the relationship: BB V BA da dg Q10: If you know that the difference of the apparent magnitude between two stars is equal to 5 magnitudes. What is their brightness? Use this equation Am т 3D ть — т, — —2.5 logio Q11. If the apparent magnitude of the first star in a binary star system is equal 1m and the apparent magnitude of the second star is equal 2m. Calculate the apparent magnitude of the system. Q12. Calculate the distance of a star if you know that its absolute magnitude is equal to (2m) and its apparent magnitude (-2m).
12. A star with spectral type MO has a surface temperature of 3750 K and a radius of 0.63 Rsun: How many times more luminous is this star than the Sun? (if it is less luminous enter a number less than one) Answer: Submit All Answers Last Answer: 0.0923 Incorrect, tries 1/5. Hint: Use the Luminosity equation, which says that L is proportional to R^2 T^4. If you keep these as ratios compared to the sun, your L will also come out as a ratio compared to the Sun. This star has a mass of 0.4 Msun- Using the simple approximation that we made in class, what is the main sequence lifetime of this star? You may assume that the lifetime of the sun is 1010 yr. Answer: Submit All Answers Compare this to the lifetime of a MO star listed in Table 22.1 (computed using a more sophisticated approach). Is the value you calculated in the previous problem longer or shorter than what is reported in the table? (L for longer, S for shorter) (You only get one try at this problem.) Answer: Submit All Answers
3. By how many magnitudes is a K5 I star more luminous than a K5 V star? How many times more luminous is this? (Hint: you may wish to review magnitude scale information given in Labs NO3 and N04.) O 1, 2.5 times as luminous O 3, 16 times as luminous O 6. 250 times as luminous O 12. 63.000 times as luminous
Which of the following can you determine about a star without knowing its distance, and which can you not determine: radial velocity, temperature, apparent brightness, or luminosity? Explain.
1. The Orion Nebula is a gas-rich region in which stars are being born. The nebula is at a distance ofVariable Stars about 1344 lyr from Earth. Suppose you observe a star in the Orion Nebula to have an apparent magnitude of 6.75 mag. Calculate the absolute magnitude of the star. Also calculate the luminosity of theThe breakthrough in measuring distances to remote parts of our Galaxy, and to other galaxies as well, came star in units of the solar luminosity (knowing that the absolute magnitude of the Sun is 4.8 mag). Jfrom the study of variable stars. Most stars are constant in their luminosity, at least to within a percent or two. Like the Sun, they generate a steady flow of energy from their interiors. However, some stars are seen to vary in
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Please do not give solution in image formate thanku Q: You’ve just discovered another new X-ray binary, which we will call Hyp-X2 (“Hyp” for hypothetical). The system Hyp-X2 contains a bright, G2 main-sequence star orbiting an unseen companion. The separation of the stars is estimated to be 12 million kilometers, and the orbital period of the visible star is 5 days. Use Newton’s version of Kepler’s third law to calculate the sum of the masses of the two stars in the system. a)Express your answer in kilograms to two significant figures. b) Give your answer from the previous part in solar masses. ( Msun= 2.0 x 10 /30 kg). Express your answer as a multiple of sun’s mass to two significant figures. C) Determine the mass of the unseen companion. ( Hint: A G2 main-sequence star has a mass of 1 Msun.) Express your answer as a multiple of sun’s mass to two significant figures. The previous answer was not correct, please help me
Describe what our Sun look like from Earth if it was a massive star? Plz help me asap with good type anwers in 3-4 sentences plzz
What are the a) luminosity and b)wavelength of maximum emission for a star with a surface temperature is 2,000K and a size of 1.0*108m?