Q9. If the luminosity of star B is 25 times the luminosity of star A, then find the distance of star A if you know that the two stars have the same brightness, and that star B is 10 astronomical leagues away from us. Use the relationship: BB BA da dg

Q: (Astronomy) PSR1913+16 Problem III. As the shape of the graph shown is not skewed, the orbit can…

A: Here given : A star is rotating with in a time period 7.75  hours which is orbital time period. The…

Q: The hydro constellation on remote Eorth How for does'the line with 13 shift towords the red end of…

A: RELATIVISTIC DOPPLER EFFECT The relativistic Doppler effect is the change in frequency (and…

Q: Describe how a star froms. What would happen to a star the size of our Sun once it runs out of…

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Q: As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually…

A: Since the luminosity of a star depends on the multiplication of power emitted by the star per unit…

Q: if a light source is not spherical, How does this affect calculations of luminosity? Do you expect…

A: Lumisosity is independent of an observer's distance from an object.It is an absolute measure of…

Q: Astronomy   Briefly explain what evidence we can use to learn about the lives of stars even though…

A: The life cycle of stars can be determined by observing the clusters of stars and the observation can…

Q: he spectrum of a star is collected and we find the absorption line of Hydrogen-Alpha (the deepest…

A: We know that the Doppler effect, According to the doppler the formula of the doppler shift of the…

Q: At rest hydrogen has a spectral line at 149nm. If this line is observed at 144nm for the star…

A: Given:hydrogen spectral line at rest, λs = 149 nmobserved spectral line, λ = 144 nmAsked:What is the…

Q: Astronomy introduction

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Q: Brightness of a Star The luminosity of a star is L = 2.5 x 106 W, and its distance from the earth is…

A: The relationship between brightness, B, luminosity, L, and distance, d, is given as, B=L4πd2

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: II E D F Compare B and C for brightness. A. B>C В. С>В С. В-С

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Q: Choose the correct statements concerning spectral classes of stars. (Give ALL correct answers, i.e.,…

A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If…

Q: 25) Recall that Hubble’s Law is given by V=HR; this means that H has units of inverse seconds…

A: A parsec is 3.26 light-years and the speed of light is 3 X 105 km/sec. Use 3.156 X 107 sec/yr.

Q: 4. Our Sun now spins once every 25 days and was formed from the gravitational contraction of an…

A: Given data The time taken by the sun is given as T1 = 25 days. The distance of the cloud is given…

Q: Explain how parallax measurements can be used to determine distances to stars. Why can we not make…

A: Parallax method is used to determine the distance between two celestial bodies. Parallax is just…

Q: A planet orbits 1 AU from a star that is 2 times as massive as our Sun. How does the star's…

A: Let, The luminosity of the star = L The luminosity of the Sun = LSun The mass of the star  = M The…

Q: White Dwarf Size II. The white dwarf, Sirius B, contains 0.98 solar mass, and its density is about 2…

A: It is given that, M=0.98 solar mass=0.98×1.989×1030 kg=1.95×1030 kgρ=2×106 g/cm3=2×106×103…

Q: 2. Suppose an absorption line in a spectrum of light from a very distant galaxy is 5015 Angstroms.…

A: Write the expression for the Dopler’s effect and solve for the speed (v) of the separation, that is…

Q: What is the Sun’s absolute magnitude (in the B-band)?

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Q: 1). A star has six times the radius of the Sun (Appendix C) and a temperature of 2000 K. Find its…

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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: 1) The Earth's orbital speed is approximately 30 km/s. A star emits a spectral line with 2=517.3 nm.…

A: The oscillation is set up due to the doppler effect.

Q: The most massive stars in the Universe have a surface temperature that can reach over 50 000 K. Life…

A: Given:Temperature of the star, T = 43000 K

Q: Hubble’s Field of View. Large telescopes often have small fields of view. For example, the Hubble…

A: Given:  Field of view is square size with 0.06o on the side.

Q: 5. The nearest star to the Sun is Proxima Centauri, a red dwarf star at a distance of 4.243 ly. Its…

A: The term apparent magnitude is used to calculate the brightness of the stars or other astronomical…

Q: what you have learned. 1.) The second brightest star in the sky (after Sirius) is Canopus. This…

A: Since you have asked multiple questions, we will answer you the first question. Kindly repost the…

Q: Imagine that you are observing the light from a distant star that is located in a galaxy 100 million…

A: Distance from star to earth d=100 million lightyears. Upon receiving light from this star we are…

Q: Let us imagine that the spectrum of a star is collected and we find the absorption line of…

A: Since            ∆λ/λ   = v/c where  c = 3*10-8m/s v    = velocity of star…

Q: 1. A mole contains 6.02 * 1023 particles (atoms, molecules, etc.). If you wanted to reach an unkown…

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Q: Solar constant, Sun, and the 10 pc distance! The luminosity of Sun is 4-- 1026 w - 4-- 1033ergs- 1,…

A: Given: Luminosity or energy radiated by sun, E = 4×1026 W Distance of the Sun from the Earth, rES =…

Q: 2. What features vary from one galaxy to the next?

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Q: Q9. If the luminosity of star B is 25 times the luminosity of star A, then find the distance of star…

A: Luminosity is an absolute measure of radiant power; that is, its value is independent of an…

Q: As shown two stars in the constellation Orion. Betelgeuse appears to glow red, whereas Rigel looks…

A: Betelgeuse appears to glow red whereas Rigel looks blue in color.

Q: Studying the spectrum of a star, we see that the Haline (l= 656.285nm) has been shifted to 656.286…

A: If source is moving away from the observer, the apparent frequency of light will be decreased (the…

Q: A star's spectrum has intense absorption lines at wavelengths characteristic o

A: The correct option is " G spectral type "

Q: What is a spectral line?

A: When an electron jumps from a  higher energy level to a lower one, photons are emitted, which…

Q: Listed below are several fictional stars with their luminosities and distances from Earth given.…

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Q: Distances to the nearest stars (up to 500 ly away) can be measured by a technique called parallax,…

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Q: What the main differences that can occur between the life cycles of a Sun-sized star and a massive…

A: A star's life cycle is determined by its mass. The larger its mass, the shorter its life cycle.…

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.