Suppose you found a star with the same mass as the Sun moving back and forth within a period of 16 months. What could you conclude? Explain in 2 – 4 sentences.
It has a planet orbiting at greater than 1 AU.
Where one astronomical unit (AU, or au), is the unit of length equal to the average, or mean, distance between Earth and the Sun, defined as 149,597,870.7 km (92,955,807.3 miles).
Suppose you found a star with the same mass as the Sun moving back and forth...
Imagine we find a star that has the same radius as the Sun, but its temperature is 9.6 times greater. That star should be _____ times as luminous as the Sun. Suppose we find a planet with an orbital period of 200 days around a star with the same mass as the Sun, but only 75 percent as luminous. What is the planet’s semi-major axis, in AU?
Suppose that you have a planet in a circular orbit about a star with the mass of the Sun. The orbital speed is 141 km/s. If you could increase the planet’s speed, what speed would you need to make it to escape the gravitational pull of its parent star?
A newly discovered planet orbits a distant star with the same mass as the Sun at an average distance of 109 million kilometers. Its orbital eccentricity is 0.5. Find the planet's orbital period. Find the planet's nearest orbital distance from its star. Find the planet's farthest orbital distance from its star.
In a certain binary-star system, each star has the same mass which is 4.4 times of that of the Sun, and they revolve about their center of mass. The distance between them is 5.7 times the distance between Earth and the Sun. What is their period of revolution in years?
In a certain binary-star system, each star has the same mass which is 3.7 times of that of the Sun, and they revolve about their center of mass. The distance between them is 6.9 times the distance between Earth and the Sun. What is their period of revolution in years?
In a certain binary-star system, each star has the same mass which is 9.6 times of that of the Sun, and they revolve about their center of mass. The distance between them is 8.0 times the distance between Earth and the Sun. What is their period of revolution in years?
A star has a mass of 3 solar masses (3 times the mass of the Sun). If a planet is 1 AU from this star, should its orbit be more or less than 1 Earth year? Explain why or why not. (show work) You see a planet that takes 1 year to orbit its star, but the planet averages 10 AU from its star. Explain what this tells you about the star.
The spectral lines of two stars in a particular eclipsing binary system shift back and forth with a period of 10 months. The lines of both stars shift by equal amounts, and the amount of the Doppler shift indicates that each star has an orbital speed of 105 m/s. What are the masses of the two stars? Assume that each of the two stars traces a circular orbit around their center of mass.
A binary star system has two stars, each with the same mass as our sun, separated by 1.50×1012 m . A comet is very far away and essentially at rest. Slowly but surely, gravity pulls the comet toward the stars. Suppose the comet travels along a straight line that passes through the midpoint between the two stars. What is the speed at the comet's midpoint?
4) Suppose you observe a star that is three times as hot as the sun, but also three smaller in radius than the sun. a) What is the wavelength at which its spectrum peaks? Is that wavelength shorter or longer than that of the sun? b) How much more (or less) power (ie., luminosity or energy per time) is it emitting in total, compared to the sun?