Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 19, Problem 37Q
To determine
The difference between a detached binary, a semi-detached binary, a contact binary and an overcontact binary.
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Chapter 19 Solutions
Universe: Stars And Galaxies
Ch. 19 - Prob. 1QCh. 19 - Prob. 2QCh. 19 - Prob. 3QCh. 19 - Prob. 4QCh. 19 - Prob. 5QCh. 19 - Prob. 6QCh. 19 - Prob. 7QCh. 19 - Prob. 8QCh. 19 - Prob. 9QCh. 19 - Prob. 10Q
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- Which is easier to observe at large distances-a spectroscopic binary or a visual binary?arrow_forwardWhat is the defining difference between a brown dwarf and a true star?arrow_forwardA G2 star has a luminosity 100 times that of the Sun. What kind of star is it? How does its radius compare with that of the Sun?arrow_forward
- Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0x10-12 watt/m?. How far away is it? Give your answer in both kilometers and light-years.arrow_forwardI need the answer as soon as possiblearrow_forwardAn O8 V star has an apparent visual magnitude of +5. Use the method of spectroscopic parallax to estimate the distance to the star (in pc). (Hints: Refer to one of the H–R diagrams in the chapter, and use the magnitude–distance formula, d = 10(mV − MV + 5)/5 where d is the distance in parsecs, mV and MV are the apparent and absolute visual magnitude respectively.)arrow_forward
- What star is a white dwarf that is much more dim and hotter than the sun. and which type of stars undergo nuclear fusion?arrow_forwardThe total mass of a binary system can be calculated from a. the ratio of the angular separation from the center of mass of each of the stars. b. the distance to the binary and its radial velocity. c. the semi major axis and period of the orbit. d. the radial velocities of the two stars. e. the time required for the small star to eclipse the larger star.arrow_forwardThe lowest mass for a true star is 1/12 the mass of the sun. What is the luminosity of this star (in units of the sun’s luminosity) based upon mass luminosity relationship? Use the exponent of 4 for easy calculations instead of 3.9arrow_forward
- QUESTION 10 Which of the following Cepheid variable stars would appear to be the brightest from Earth? A Cepheid variable star that is 10,000 times as luminous as the sun. A Cepheid variable star with a period of 10 days. A Cepheid variable star with a period of 3 days. There is not enough information given.arrow_forward12: A star with spectral type A0 has a surface temperature of 9600 K and a radius of 2.2 RSun. How many times more luminous is this star than the Sun? (if it is less luminous enter a number less than one) Answer: 36.854 13:This star has a mass of 3.3 MSun. what is the main sequence lifetime of this star? You may assume that the lifetime of the sun is 1010 yr. Please answer question 13 thank you.arrow_forwardYou observe a star system for many weeks. The light curve does not show significant changes in brightness, but a series of spectra show a spectral feature that cyclically appears as one absorption line, then two, then one again, and so on. Is this a binary system?arrow_forward
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