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 that for all stars L∝M?
Homework Answers
Add Answer to:
Last time we found that the time a star stays on the main
sequence depends critically...
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...
Ty Lifetimes. Zero-age main sequence stars much less than 0.5Mo are the alternate form of "dark m...
ty Lifetimes. Zero-age main sequence stars much less than 0.5Mo are the alternate form of "dark matter". Assume a brown dwarf's luminosity derives from gravitational contraction alone. Its mass is 0.05 Mo, and its luminosity is 3 x 10-3Lo. Such stars maintain a tight correlation between radus and mass given by R 9 x 10 (M/Mo)-1em. If we assume that its luminosity has been constart a) calculate a radiation temperature and wavelength to demonstrate these stellar objects as "dark". (b)...
In class, we derived an expression for the lifetime of a main sequence star assuming only...
In class, we derived an expression for the lifetime of a main sequence star assuming only 10% of the mass can be used as fuel. However, for stars less massive than about 0.5 solar masses, the star is fully convective, and 100% of the mass can be used as fuel, which increases the lifetime by a factor of 10. Use this information and the original lifetime formula to estimate the lifetime of a 0.1 solar mass star. Express your answer...
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.
All of this is nice, but stars don't do much as they exist on the Main...
All of this is nice, but stars don't do much as they exist on the Main Sequence except stay extremely stable and fuse hydrogen into helium in the core. But for a high-mass star like Betelgeuse what will we expect to happen when hydrogen runs out in the core? Helium will start fusing in the core, a shell of hydrogen will start fusing around the core, and the rest of the star will expand causing the radius to increase, the...
please help me solve these PHYS 122 Explain or justify all answers Astronomy: Stars & Galaxies...
please help me solve these
PHYS 122 Explain or justify all answers Astronomy: Stars & Galaxies HOMEWORK Unit III 1) How are the p-p chain and the CNO cycle similar? What kinds of stars have each as their main fusion reaction? 2) What is the underlying physical reason that there is a mass-luminosity relation? Explain. 3) Why does a star's life expectancy depend on its mass? EXPLAIN 4) What are the main sequence lifespans of (a) a 25 solar mass...
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.
#2 please ! Ro le Astronomy 1F03 Problem Set 3 Thursday, Nov 10th, 2019 Write your...
#2 please !
Ro le Astronomy 1F03 Problem Set 3 Thursday, Nov 10th, 2019 Write your answers on a separate sheet and show your work 1. The protesproton chain effectively c erta hyre en into hem according to 4 He. A Helium wus weighs 6.64518 x 10 IT kg and Hydrogen mucha proton) welches 1.67262 x 10 Workout the change in a when I kg of Hydrogen is converted completely into Helium 4. Convert the change in mass Per burning...
What is the reason for two stars to have the same brightness but one being 100...
What is the reason for two stars to have the same brightness but one being 100 times more luminous than the other? One of them is 100 times more distant One of them is 10 times more distant One of them is 1000 times more distant One of them is 4π times more distant The Brightness scale like the inverse of the square of the distance (1/R2) T F What is parallax? The distance of a star A method to...
m. solar nebula к. asteroid I. comet Jovlll plalie n. planetesimal 2. A star had 10 times the mass of the Sun when it was on the Main Sequence. At the end of its life it has a core with a mass t...
m. solar nebula к. asteroid I. comet Jovlll plalie n. planetesimal 2. A star had 10 times the mass of the Sun when it was on the Main Sequence. At the end of its life it has a core with a mass two times the mass of theSn. Explin what hppdto the rest of the mas and wiy, o. lunar eclipse p. solar eclipse 9. Where did the heavy elements that most of the Earth is composed of originate? a)...
ty Lifetimes. Zero-age main sequence stars much less than 0.5Mo are the alternate form of "dark matter". Assume a brown dwarf's luminosity derives from gravitational contraction alone. Its mass is 0.05 Mo, and its luminosity is 3 x 10-3Lo. Such stars maintain a tight correlation between radus and mass given by R 9 x 10 (M/Mo)-1em. If we assume that its luminosity has been constart a) calculate a radiation temperature and wavelength to demonstrate these stellar objects as "dark". (b)...
All of this is nice, but stars don't do much as they exist on the Main Sequence except stay extremely stable and fuse hydrogen into helium in the core. But for a high-mass star like Betelgeuse what will we expect to happen when hydrogen runs out in the core? Helium will start fusing in the core, a shell of hydrogen will start fusing around the core, and the rest of the star will expand causing the radius to increase, the...
please help me solve these
PHYS 122 Explain or justify all answers Astronomy: Stars & Galaxies HOMEWORK Unit III 1) How are the p-p chain and the CNO cycle similar? What kinds of stars have each as their main fusion reaction? 2) What is the underlying physical reason that there is a mass-luminosity relation? Explain. 3) Why does a star's life expectancy depend on its mass? EXPLAIN 4) What are the main sequence lifespans of (a) a 25 solar mass...
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.
#2 please !
Ro le Astronomy 1F03 Problem Set 3 Thursday, Nov 10th, 2019 Write your answers on a separate sheet and show your work 1. The protesproton chain effectively c erta hyre en into hem according to 4 He. A Helium wus weighs 6.64518 x 10 IT kg and Hydrogen mucha proton) welches 1.67262 x 10 Workout the change in a when I kg of Hydrogen is converted completely into Helium 4. Convert the change in mass Per burning...
m. solar nebula к. asteroid I. comet Jovlll plalie n. planetesimal 2. A star had 10 times the mass of the Sun when it was on the Main Sequence. At the end of its life it has a core with a mass two times the mass of theSn. Explin what hppdto the rest of the mas and wiy, o. lunar eclipse p. solar eclipse 9. Where did the heavy elements that most of the Earth is composed of originate? a)...
Most questions answered within 3 hours.
-
Free content. Free software. Freemium pricing models. Viral
popularity. Disappearing gatekeepers. These are the disrupters of...
asked 4 minutes ago -
Consider the simple linear regression model: HARD1 =
β0 + β1*SCORE + є, where
є ~...
asked 58 minutes ago -
In the Chesapeake region during the mid-17th
century how similar was the experience of an independent...
asked 3 hours ago -
. A 2.50 M stock solution was used to prepare a dilute NaOH
solution with a...
asked 4 hours ago -
Write a program that reads in a text file, infile.txt, and
prints out all the lines...
asked 6 hours ago -
Which of the following orbits have a total of zero energy (based
on the common convention)?...
asked 6 hours ago -
Find the expected count and the contribution to the chi-square
statistic for the (Group 1, No)...
asked 8 hours ago -
Suppose you are purchasing a meal and with every meal a you
receive one of 10...
asked 7 hours ago -
A 75.0 kg 0erson is riding in a car moving at 20.0 m/s when the
car...
asked 7 hours ago -
What does Δp = QR mean in words?
Pushing a viscous fluid through a pipe requires...
asked 8 hours ago -
We know that system.out.println (“object number” + n ); is
legal.String name; int n; name =...
asked 8 hours ago -
Come up with a real-life problem (open-ended) and solve it by
designing and writing a Java...
asked 8 hours ago