What kind of star will the Sun be after it leaves the main sequence?
Homework Answers
when our Sun runs out of hydrogen fuel i.e. after main sequence, it will expand to become a red giant, puff off its outer layers, and then settle down as a compact white dwarf star, then slowly cooling down for trillions of years.
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What kind of star will the Sun be after it leaves the main
sequence?
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.
The mass of a main-sequence star is 10 times the mass of the Sun. Its luminosity...
The mass of a main-sequence star is 10 times the mass of the Sun. Its luminosity is 3,000 times the luminosity of the Sun. Find its lifetime in years, giving the answer to two significant figures.
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.
1. Describe the early history of the Sun. What did it start as? What lead to it becoming a smalli...
1. Describe the early history of the Sun. What did it start as? What lead to it becoming a smallish main sequence star? 2. Describe the future of the Sun. Roughly how long will it take for the Sun to leave the main sequence? What will happen when it leaves the main sequence? Will the Sun go supernova? 3. The remnants of stars 25 to 40 times more massive than the Sun may have such a strong _______ pull that...
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...
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...
Problem 7 (FC 7.12). The binary star system Cygnus X-1 consists of a main sequence star...
Problem 7 (FC 7.12). The binary star system Cygnus X-1 consists of a main sequence star of mass 20 Mo and a black hole of mass 16 Mo, where M.: 1.99 × 1030 kg is the mass of the sun. If its mutual rotation period is 5.6 days, find the mean distance between them.
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...
Find the expected main-sequence lifetime of a 6.30 MSunMSun star, in years.
Find the expected main-sequence lifetime of a 6.30 MSunMSun star, in years.
HD531531 (not a real star) is a 5 solar mass zero age main sequence star at...
HD531531 (not a real star) is a 5 solar mass zero age main
sequence star at a distance of 100 parsecs. If X has a luminosity
550 times and
the .
Write down , the
flux per unit wavelength from this star, in units or ergs
.
We were unable to transcribe this imageTeff = 17180K We were unable to transcribe this imagecm-5-1 Angstrom-1
Problem 7 (FC 7.12). The binary star system Cygnus X-1 consists of a main sequence star of mass 20 Mo and a black hole of mass 16 Mo, where M.: 1.99 × 1030 kg is the mass of the sun. If its mutual rotation period is 5.6 days, find the mean distance between them.
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...
HD531531 (not a real star) is a 5 solar mass zero age main
sequence star at a distance of 100 parsecs. If X has a luminosity
550 times and
the .
Write down , the
flux per unit wavelength from this star, in units or ergs
.
We were unable to transcribe this imageTeff = 17180K We were unable to transcribe this imagecm-5-1 Angstrom-1
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