Using the Mass-Luminosity relationship, estimate the luminosities for each of the following stars:
luminosity is proportional to 3.5 times of mass so if mass of
main sequence star is 2 times the mass of sun then luminosity will
be 11.31 of sun.luminosity of sun is 3.83*10^26.
(a)if mass is 25 M sun then luminosity is 78125*luminosity of sun,
78125*3.846*10^26 = 3.0047e31
(b)if mass is 2.5 M sun then luminosity is 24.70*luminosity of sun,
24.7*3.846*10^26 = 9.5*e27
(c)if mass is 0.25 M sun then luminosity is 0.0078125*luminosity of
sun, 0.0078125*3.846*10^26 = 3e24
Using the Mass-Luminosity relationship, estimate the luminosities for each of the following stars: 25 MSun star...
• The background pages of this module talked about the mass-luminosity relationship for stars on the main sequence: L M 3.5 Question 8: What can you conclude about the masses of stars along the main sequence? Luminosity increases as mass increases as we move from the lower right to the upper left.
the stars in Question 1 has a mass of about 2 Msun. As shown in the adjacent image, the star has tiny star orbiting it at a distance of 20 Astronomical Units (AU). How long does it take the tiny star to complete its orbit around the large star?
(b) Use the mass-radius and mass-luminosity relations for main-sequence stars to express the dynamical timescale of main-sequence stars as a function of the mass of the star only.
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
A White Dwarf star has a luminosity L = 0.01 Lo (where Lo is one solar luminosity) and an effective temperature of T = 16,000 K. Using this information: (i) Estimate the radius of this star. (ii) Given that the mass of this star is 1 Mo (where Mo is one solar mass), estimate the its average density. (iii) Calculate the internal temperature of the star, T_int and show that the electrons are mostly degenerate. (iv) When a carbon White...
Estimate the luminosity and
temperature of the star Vega by examining its vertical and
horizontal position in the H-R diagram . (Hint: You should make an
estimate of these values by interpolating between the values marked
on each axis). Using the values you estimated, determine the size
of Vega as compared to the Sun using the Stefan-Boltzmann law.
Spectral type 106 Alnilam 、、\Rigel A 、、\ Betelgeuse Adhara Deneb Antares 、 104 Spica A Polaris Spica B 、\-pergian Canopus Arcturus Rigel...
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?
2) (a) Plot, on a log-log scale, the Main Sequence lifetime versus Mass. Use the mass and luminosities for the star types shown on the table below. (b) Also determine a "best-fit straight line" to this data (a best-fit straight line "by eye" is good enough here) with a slope of -2.5 (this was given in the module as a rough, but not bad, approximation to the Mass-Luminosity Relationship. (c) Where does -2.5 fail the worst? (Marks: 6) Note: the...
Review I Constants Periodic Table Part A 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 7.0x104 m/s relative to the other What are the masses of the two stars? Assume that each of the two stars traces a circular orbit around...
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...