How does luminosity differ from apparent brightness ?

Q: How many times brighter or fainter would a star appear if it were moved to: a. twice its present…

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Q: A certain quaternary star system consists of three stars, each of mass m, moving in the same…

A: The expression for the period of the each of three stars is,

Q: Hertzsprung-Russell Diagram Blue or blue White Vellow Red-orange Red Rigel Beteignuse Aldebaran…

A: As it can be seen from Hertzsprung-Russell diagram that the y axis represents brightness which…

Q: Before the era of photography, telescopic measurements of star positions (coordinates) in the sky…

A: The first person to succeed at measuring the distance to a star using parallax was F.W. Bessel, who…

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: How long a star "lives" depends on: O its color. whether it is single or binary. O its starting…

A: The more mass the star has faster it burns down and explode into a supernova.

Q: What four (4) stars are not as bright (luminous) as our Sun? JUST NAME 4 STARS THAT ARE NOT AS…

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Q: The velocities of the two stars are 28km/s and 13km/s, and their periods are both 16 years. Find the…

A: Formula Let period of a star is T, velocity is v, orbital radius is r and , mass is M, Now the…

Q: Find the distance in parsecs to van maanen's star, a nearby white dwarf, which has an annual…

A: given ,       parallax (p) = 0.232 arcsec

Q: If the Sun expanded to a radius 10 times its current size and its temperature decreased by 55%, how…

A: Given  Radius of sun increased by 10 times Temp decreased buy 55% Tf = 0.45 Ti

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: A star spans a parallax angle θ = 2 arcsecond when seen on Earth (6 months spans 2θ).  Its distance…

A: The astronomers use the unit Parsec, for measuring the distance. 1 parsec is the distance to a star…

Q: Mention a method to measure temperature of a star.

A: Temperature of the stars cannot be measured directly as they are very far.

Q: If a star is 30 parsecs away what is it's observed parallax shift ?

A: Given thatThe distance to the star (d)=30 parsecsParallax Formulad=1pp=the parallax angle of the…

Q: What is the dependence of the intensities of stars on parallax? Hint: consider the inverse-square…

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Q: Distinguish between eutectoid and eutectic terms a in binary system.

A: We have to give difference between eutectoid and eutectic  terms

Q: The Hertzsprung-Russell diagram graphs stars' O brightness and temperature. O distance and…

A: Answer- brightness and temperature The Hertzsprung - Russell diagram is a graph in which we plot…

Q: To what degree are surrounding components influencing brightness constancy?

A: in this question discuss the what factors affect to brightness constancy.

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

A: We have to mention the main differences that can occur between the life cycles of a Sun-sized star…

Q: If the Sun expanded to a radius 160 times its current size and its temperature decreased by 55%, how…

A: SOlution: Given that Rnew = 160R Tnew = (1-0.55)T Tnew = (0.45)T

Q: Which star is at higher temperature, a red star or a blue star?

A: The temperature of blue star is 40000 Kelvin degrees.

Q: A star with apparent magnitude 5 is brighter than a star with apparent magnitude 15 by how much? A…

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Q: What did you calculate for the radius of the star that had a temperature of 5880 degrees Kelvin and…

A: Given : Temperature=T=5880∘ K Luminosity=L=78 W We have to calculate the value of radius R of the…

Q: The observed brightness of a luminous object falls off as the square of its distance from us (the…

A: Given  measure a different apparent brightness. Because the visual brightness of the further one is…

Q: mass

A: The evolution is affected by mass exchange in the binary. The higher mass  Star use to be the lower…

Q: A less massive star will usually live longer than a more massive star O True O False

A: In star hydrogen is the fuel

Q: Given two stars in a binary star a total distance of 16 AU apart and an orbital period of 4 years…

A: Two Masses in the universe attract each other by a gravitational force. This force is directly…

Q: Chart the evolutionary process of a high mass star on the H–R diagram from ZAMS to death.

A: Required to draw: The evolution of high mass stars from Zero Age Main Sequence (ZAMS) to Death: We…

Q: Show that if two stars of the same luminosity form a close binary pair, the magnitude apparent light…

A: Let mass of star 1=m1 mass of star 2=m2 apparent magnitude of m1=x apparent magnitude of m2=y

Q: nitude m = 3.6.  What is the apparen

A: Given: To find the magnitude of the dimmer star is calculated shown as: m2 =3.6,b1b2  =12.4

Q: Star A is located four times farther from Earth than Star B, but both have the same apparent visual…

A: Questions based on the  star apparent and absolute visual magnitude.

Q: Size, surface temperature, and distance from the Earth are three things that determine the of the…

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

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Q: Star S1 is three times more luminous than S2. What is the difference between their magnitudes…

A: If m1 and m2 the virtual magnitudes of first and second object and L1 and L2 are luminosity of the…

Q: The nearest star to our solar system is 4.29 light years away. How much is thisdistance in terms of…

A: Given information:The distance between Earth and the alpha Centauri = 4.29 light years (ly).

Q: Two stars – A and B, of luminosities 0.5 and 4.5 times the luminosity of the Sun, respectively – are…

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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.