Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 17, Problem 58Q
To determine
The way to calculate the distance of star whose parallax is too small.
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What is the parallax angle of a star that is 50 pc away? enter your answer in arc seconds
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Let us imagine that the spectrum of a star is collected and we find the absorption line of Hydrogen-Alpha (the deepest absorption line of hydrogen in the visible part of the electromagnetic spectrum) to be observed at 656.5 nm instead of 656.3 nm as measured in a lab here on Earth. What is the velocity of this star in m/s? (Hint: speed of light is 3*10^8 m/s; leave the units off of your answer)
Chapter 17 Solutions
Universe: Stars And Galaxies
Ch. 17 - Prob. 1QCh. 17 - Prob. 2QCh. 17 - Prob. 3QCh. 17 - Prob. 4QCh. 17 - Prob. 5QCh. 17 - Prob. 6QCh. 17 - Prob. 7QCh. 17 - Prob. 8QCh. 17 - Prob. 9QCh. 17 - Prob. 10Q
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- 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.arrow_forwardWhat is the advantage of measuring a parallax distance to a star as compared to our other distance measuring methods?arrow_forwardName and describe the three types of binary systems.arrow_forward
- How do you calculate the mass of a star?arrow_forwardA star is observed to have a parallax of 0.05". If we were to send a radio signal towards this star how much time would it take for the signal to reach the star?arrow_forwardWhat four (4) stars are not as bright (luminous) as our Sun? JUST NAME 4 STARS THAT ARE NOT AS BRIGHT (LUMINOUS) AS OUR SUN? Asap help needed!!!arrow_forward
- Calculate by how many times Betelgeuse is brighter than the Sun, if its parallax is 0.006 arcsec, and its apparent magnitude is m = +.5. Can you first use the parallax to calculate the distance and then use the magnitude-distance formula to find the absolute magnitude of Betelgeuse and finally, compare it to the absolute magnitude of the Sun which is -26,74 because other experts used other methods and the answer was not correct.arrow_forwardThe star Spica is observed to have a parallax of 0.012000. How far away is it in parsecs answers to three significant figures.arrow_forwardAlpha Centauri has a parallax angle of 0.7420", calculate its distance in parsecs and in light-years. Show your work!arrow_forward
- Describe two ways of determining the diameter of a star.arrow_forwardYou are able to take spectra of both stars in an eclipsing binary system. List all properties of the stars that can be measured from their spectra and light curves.arrow_forwardSuppose you have discovered a new cepheid variable star. What steps would you take to determine its distance?arrow_forward
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