Sirius, the brightest star in the sky, is a main-sequence star, as is the Sun, but...
Sirius, the brightest star in the sky, is a main-sequence star, as is the Sun, but Sirius has a luminosity about 27 times that of the Sun and a mass about 3 times that of the Sun. Use this information to determine which star will live longer, and by what factor, approximately.
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Sirius, the brightest star in the sky, is a main-sequence star,
as is the Sun, but...
Sirius, the brightest star in the sky, is actually a binary system. Sirius A is a main sequence star of two solar ma...
Sirius, the brightest star in the sky, is actually a binary system. Sirius A is a main sequence star of two solar masses in orbit with Sirius B, a white dwarf star. Assuming the two stars orbit each other with an average radius of 19.85 AU, what is the period of their orbit? What is their average tangential velocity? Warm Up
Sirius, the brightest star in the sky, is actually a binary system. Sirius A is a main sequence star...
Sirius The brightest star in the night sky is Sirius, which is at a distance of...
Sirius The brightest star in the night sky is Sirius, which is at a distance of 8.30×1016 m, when we look at this star, how far back in time are we seeing it? Express your answer in years. Submit Answer Tries 0/15
The Sun is about 10.0 billion times brighter than the next brightest star, Sirius (as seen...
The Sun is about 10.0 billion times brighter than the next brightest star, Sirius (as seen from Earth). How far would we have to be from the Sun for the Sun to be as bright as Sirius? We would have to be ___× 10 5th AU or _____light-years away from the Sun.
(a) The observed parallax of Sirius, the brightest star in the sky, is 0.375 arcseconds. How...
(a) The observed parallax of Sirius, the brightest star in the sky, is 0.375 arcseconds. How far away is it in parsecs? In light years? (b) The Hipparcos spacecraft could measure parallaxes as small as 0.001 a How distant is the furthest star for which we can measure parallax? How does this distance compare to the size of the galaxy!
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed...
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed luminosity is about 20 LO How can you explain the difference? The mass-luminosity relationship predicts that Sirius is about Sirius's higher luminosity is a result of its higher Sun's. Themassluninosit reSisis a times more luminous than the Sun. surface temperature and lrger surface area compared to the
The brightest star in the northern celestial hemisphere has a surface temperature of about 4300 K...
The brightest star in the northern celestial hemisphere has a surface temperature of about 4300 K and it is 170 times more luminous than the Sun. Calculate the radius of the star in units of the radius of the solar radius (round the result to the nearest integer) In the calculation, you may assume that the Sun has a radius of 7E8 meters and a luminosity of 3.8E26 watts.
According to Einstein’s formula, E=mc^2, the energy radiated away from the Sun (or any star for...
According to Einstein’s formula, E=mc^2, the energy radiated away from the Sun (or any star for that matter) represents a loss in mass. That is, every Joule of energy radiated away from the Sun diminishes its mass by m=E/c^2. Assume that the Sun’s luminosity is 3.8X10^26 J/s. a) Determine the amount of mass (in kg) that the Sun would lose by shining at that same luminosity for 10 billion years. b) Sirius A will last about 90 million years as a...
Last time we found that the time a star stays on the main sequence depends critically...
Last time we found that the time a star stays on the main sequence depends critically on its mass. We found this result by using the empirical relation that the luminosity L depends strongly on its mass, L∝M^3.5. Now let us assume that instead for all stars the luminosity L is directlyproportional to M, L∝M. If the sun stays on the main sequence for 10Gyr, how long would a60M star stay on the main sequence, and a 0.5 M star, given...
A 100 MꙨ (i.e 100 times the mass of the Sun) main-sequence star is close to...
A 100 MꙨ (i.e 100 times the mass of the Sun) main-sequence star is close to its Eddington limit, is powered by the CNO cycle, and has a central temperature of 3x10^7 K. How massive must a star be before it can begin burning He while still on the main sequence? From this, estimate how many such stars (if any) you might expect to find in the Milky Way.
5. The HR Diagram. Suppose we consider a main sequence “O star” much more massive than...
5. The HR Diagram. Suppose we consider a main sequence “O star” much more massive than the sun. According to the formulae shown in lecture: a. What is the luminosity of a main-sequence O star (in solar units, Lsun) of mass 100 solar masses? b. If the sun were a 100 solar mass main-sequence O star, how much brighter would it appear from the earth? c. What is the hydrogen fusing lifetime of this star in years? d. If the...
Sirius, the brightest star in the sky, is actually a binary system. Sirius A is a main sequence star of two solar masses in orbit with Sirius B, a white dwarf star. Assuming the two stars orbit each other with an average radius of 19.85 AU, what is the period of their orbit? What is their average tangential velocity? Warm Up
Sirius, the brightest star in the sky, is actually a binary system. Sirius A is a main sequence star...
Sirius The brightest star in the night sky is Sirius, which is at a distance of 8.30×1016 m, when we look at this star, how far back in time are we seeing it? Express your answer in years. Submit Answer Tries 0/15
(a) The observed parallax of Sirius, the brightest star in the sky, is 0.375 arcseconds. How far away is it in parsecs? In light years? (b) The Hipparcos spacecraft could measure parallaxes as small as 0.001 a How distant is the furthest star for which we can measure parallax? How does this distance compare to the size of the galaxy!
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed luminosity is about 20 LO How can you explain the difference? The mass-luminosity relationship predicts that Sirius is about Sirius's higher luminosity is a result of its higher Sun's. Themassluninosit reSisis a times more luminous than the Sun. surface temperature and lrger surface area compared to the
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