Answered: 7) Calculate the luminosity of a star…

Science

Advanced Physics

7) Calculate the luminosity of a star that has a radius of 4.2Rsun and a temperature of 5Tsun

Related questions

Q: 12) Estimate the wavelength of the radiation emitted by an interstellar cloud of 4000 K. nts)

A: Interstellar clouds are made of gas and dust particles that are left over after a star dies. When an…

Q: 31) Star Betelgeuse has an apparent magnitude of 0.42 and an absolute magnitude of -5.6. Estimate…

A: The distance magnitude formula relates the apparent and absolute magnitude of a celestial object…

Q: 13) Calculate the luminosity in watts from the absolute magnitude for the given stars: (a) Sun (M =…

A: Luminosity can be defined as an absolute measure of radiated power emitted by a light source over…

Q: 2) What happens when one of the star ina binary system becomes a black hole.

A: Binary systems are two astronomical bodies that orbit each other around a common center of mass. If…

Q: Solve only c,d option. thee evolution of a star is determined uniquely by its…

Q: 6) Estimate the distance to the star Aldebaran with absolute magnitude -0.641 and apparent magnitude…

A: The absolute magnitude is the magnitude of a celestial object if it was observed from a distance of…

Q: Two stars are in a closely orbiting binary system. The smaller star (a K-type main sequence star)…

A: The correct option. Following the mass transfer, which of the following is now true of the main…

Q: Use t = to compute the life expectancy of a 0.9-solar-mass star. (A solar lifetime is approximately…

Q: 29) Estimate the distance to the North Star if it has an absolute magnitude of -3.2 and an apparent…

A: In astronomy when studying a star or any celestial object we use two different magnitudes. Apparent…

Q: As seen from Earth, a star has a transverse velocity of 96 km/s and a radial velocity of 64 km/s.…

A: The space velocity (V) of the star with respect to Earth is given by: V = √(V_r^2 + V_t^2) where…

Q: Rev5 Phys 1403 Stellar Magnitudes and Parallax Since the minimum brightness visible will be…

A: (1) Given: The magnitude of Mizor is 2.4. The brightness of Mizor in companion to Alcor is 4.37…

Q: A star is an example of a true blackbody. True False

A: We have to identify if the given statement 'A star is an example of a true blackbody' is true or…

Q: A star is observed to be thrice the size of the Sun with temperature of 1.3Tsun. Estimate its…

A: The energy radiated by a star is defined as its luminosity. Luminosity depends on the temperature…

Q: Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…

A: 1. Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…

Q: Consider a gas of pure ionized hydrogen. Calculate the central pressure of a Sun- like star which is…

A: Given, Temperature T = 2 × 108 K Mass density D = 2 × 105 kg/m3 Pressure P…

Q: What kind of reactions provide a star with energy

A: There are mainly two type of nuclear reactions. 1. Nuclear fission 2. Nuclear fusion In…

Q: 8) Calculate the luminosity of a star that has a radius of 3Rs and a temperature of 2Tsum-

A: The luminosity of a star or a galaxy is defined as the energy radiated by the star or galaxy.…

Q: Calculate the distance of a star if the stellar spectrum indicates an absolute magnitude of -10.0,…

A: Given,Absolute magnitude, M =- 10Apparent magnitude, m = 5From magnitude distance formula,m -M = 5…

Q: 13) Calculate the luminosity in watts from the absolute magnitude for the given stars: (b) Sirius (M…

A: The luminosity of a star or an astronomical object is defined as the energy radiated per unit of…

Q: subject: astronomy) 1. When do you say a star is very hot compared to the red. 2. are stars of equal…

A: Answer (1) A blue star will always be hotter than the red star. It is independent of the relative…

Q: 2.9) Explain how astronomers might use spectroscopy to determine the composition and temperature of…

A: Atoms consist of discrete energy states called quantum states. When a transition takes place from…

Q: The figure below represents the black body curves for two different stars, C and E. Which one would…

A: Answer is as follows

Q: If you find that the hydrogen alpha line in a star's spectrum occurs at a wavelength of 656.45 nm,…

Q: 5. The Luyten 762-8 star system contains two stars, one with apparent 12.5 and the other with m =…

A: Given : mVega =0 , m1 = 12.5 and m2 =12.9 Concept : mVega - m = 2.5 log(L/LVega)

Q: 7) The H-alpha line from a star is observed to be 850 nm. Estimate its redshift

Question

100%

Transcribed Image Text:7) Calculate the luminosity of a star that has a radius of 4.2Rsumn and a temperature of 5T su Sun

Expert Solution

Concept and Principle:

Stars generate an immense amount of energy through fusion. The luminosity of a star or a galaxy is defined as the energy radiated by that star or the galaxy.

In main sequence stars, the luminosity is directly proportional to the temperature of the star. Hotter stars are more luminous than colder stars.

The luminosity of a star can be defined in terms of the luminosity of the Sun. It is given by,

$\frac{L}{L_{Sun}} = {(\frac{R}{R_{Sun}})}^{2} {(\frac{T}{T_{Sun}})}^{4}$

Here L is the luminosity of the star, L_Sun is the luminosity of the Sun, R is the radius of the star, R_Sun is the radius of the Sun, T is the temperature of the star, and T_Sun is the temperature of the Sun.

Trending now

This is a popular solution!

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Similar questions

4. List the seven main classes of stars, from hottest to coolest.
3. Consider the following stellar spectra from the sun and from a supercluster of galaxies. ABSORPTION LINES FROM THE SUN ABSORPTION LINES FROMA SUPERCLUSTER OF GALAXIES BAS11 v = 0.07c, d 1 billion light years (a) Describe the movement of the stars in the supercluster relative to the sun. (b) Suppose the absorption lines on the bottom spectrum had varying thickness. What would this indicate about the stars in the supercluster?
Describe the plysical environment and processes to obtain the emission line spectra and absorption line spectra from the stars. Describe the physical environment and processes to obtain the emission line spectra and absorption line spectra from the stars. haha maintained a high
3- Consider a binary star system in which the two stars are seen to be 1.50" apart. Determine the actual physical separation of those stars (in AU) if this binary system is located 9.50 1.y. from us.
31) Star Sirius has an apparent magnitude of -1.47 and an absolute magnitude of 1.41. Estimate the distance to Sirius.
33) A star is observed to be having an absolute magnitude of -5.6 and is located at a distance of 159.96 pc. Estimate the apparent magnitude
8) A neutron star is found with a radius of 10 km and has a surface temperature of 1,000,000 K. Calculate its luminosity with respect to that of the Sun. nts)