Concept explainers
(a)
The distance to 70 Ophiuchi in parsecs.
Answer to Problem 68Q
Explanation of Solution
Given:
Formula used:
Calculation:
Conclusion:
The distance to 70 Ophiuchi in parsecs =
(b)
The actual length of the semimajor axis in AU.
Answer to Problem 68Q
Actual length of the semimajor axis in astronomical units =
Explanation of Solution
Given:
The distance to 70 Ophiuchi in parsecs =
Formula Used:
Calculation:
Conclusion:
Thus, semi major axis is
(c)
The sum of the mass of the two stars.
Answer to Problem 68Q
The sum of masses of the 2 stars in 70 Ophiuchi =
Explanation of Solution
Given:
Formula Used:
Where, M represents mass, G is the gravitational constant, T is the period and a is the semi-major axis.
Calculation:
Conclusion:
The sum of masses of the 2 stars in 70 Ophiuchi =
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Chapter 17 Solutions
Universe: Stars And Galaxies
- As seen from Earth, the Sun has an apparent magnitude of about 26.7 . What is the apparent magnitude of the Sun as seen from Saturn, about 10 AU away? (Remember that one AU is the distance from Earth to the Sun and that the brightness decreases as the inverse square of the distance.) Would the Sun still be the brightest star in the sky?arrow_forwardIf two stars are in a binary system with a combined mass of 5.5 solar masses and an orbital period of 12 years, what is the average distance between the two stars?arrow_forwardWhat is the advantage of measuring a parallax distance to a star as compared to our other distance measuring methods?arrow_forward
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