The percentage of helium used immediately during a star’s helium flash phase is

Q: Star A and Star B are both on the main sequence. Star A is 74 times more luminous than Star B. What…

A:

Q: of a star occur

A: Possible stages of a star that occurs are as follows:

Q: The mass-luminosity relation describes the mathematical relationship between luminosity and mass for…

A: L/Lo = (M/Mo )3.5  here the luminosity is to be found in terms of Lo  M = 4Mo

Q: Which stars are associated with a planetary nebula? black holes, neutron star's, white dwarf or main…

A: Required : What are planetary nebula associated with.

Q: A star with a radius twice that of the Sun and a surface temperature twice that of the Sun, will…

A: Luminosity of a star of radius R and surface temperature T is given by L=4πσR2T4 where is the…

Q: Star 1 emits energy at a rate that is 2 times that of Star 2. If Star 1 also has a radius that is 3…

A:

Q: A newly discovered bright star has a luminosity of 78.4×1026 W. What is its temperature if it has a…

A:

Q: A star with a radius three times that of the Sun and a surface temperature twice that of the Sun,…

A: 144

Q: If our Sun has a temperature of 6000 K and a luminosity of 1 Solar Luminosity, what is the…

A: Given:

Q: Suppose a star has luminosity 100 times greater than than Sun and a radius 4 times greater than the…

A:

Q: What size star is the sun? O supergiant O medium O giant O white dwarf

A: The sun size is about 696340 km in radius and it's mass is 1.989*10^30 kg.

Q: A white dwarf star has a visual luminosity of 0.046LSun. If you were 1 AU from the white dwarf, what…

A: Ldwarf = 0.046Lsun Distance d = 1 AU = 1.496×1011 m Lsun = 3.827×1026 W

Q: sequence

A: Hertzsprung-Russell's diagram clearly shows that the star spends most of its life as a main-sequence…

Q: Pls help ASAP. Pls show all work.

A: Given context: Life cycle of Low mass star: A low mass star life starts from a "Zero-Age Main…

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: Explain the characteristics of Luminosity and the wavelength spectrum of the stars in the following…

A: Stars still more luminous than giants are referred to as supergiant and hyper giants. A hot,…

Q: ars originate as large bodies of slowly rotatin8 gas. Because of gravity, these clumps of gas sowly…

A: A: conservation of angular momentum : if the net torque acting on the system is zero, then the total…

Q: In the Sub giant phase which of the following is true? O The star is burning He in the core O The…

A: Given : In the Sub giant phase  The star is burning He in the core The star is burning He in a shell…

Q: What causes a star to move off the main sequence?

A:

Q: Describe what would happen to the luminosity of a star if its temperature doubles and its radius…

A: Luminosity of a star depends on both temperature and radius.  L ∝ R2 T4

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: The life-cycle path followed by a star is determined by the star’s initial  A. mass and size B.…

A: Star's mass is inversely proportional to its life cycle.

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 Sun is a G2 star. Which of the following spectral types is slightly hotter than the Sun? O A. 03…

A: Spectral types Temperature (K) O3 >55,000 K0 5240 A1 9330 F2 7050 M9 <2700

Q: The luminosity of Cepheid variable stars is related to the _______ of their pulsations.

A: Cepheid variables are named after the star Delta Cepheid of the fourth brightest star in…

Q: For each statement concerning main sequence stars, select T True, F False, G Greater than, L Less…

A: Required :  True or False, greater, lesser, equal.

Q: Stars of the same spectral type have the same: absolute magnitude number temperature luminosity

A: two stars with identical spectra have the same intrinsic luminosity

Q: A solar type star evolves into a red giant with a luminosity 1000 L⊙ and radius of 1 AU. Determine…

A: Given: Luminosity of red giant is L=1000Lsun=103×3.846×1026 W Radius of red giant is r=1…

Q: What is the life expectancy (in years) of a 10 M⊙ main-sequence star? What is the life expectancy…

A: Required : The life expectancy of stars.

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: Describe how energy generated in the core of a 1-solar-mass star gets to the star's surface.

A:

Q: What observations would you make of a star to determine whether its primary source of energy is…

A: Required : What observations would you make of a star to determine whether its primary source of…

Q: What is the mass of a star with a main-sequence lifetime of 6 billion years

A: Given: The main-sequence lifetime of a star is 6 billion years.

Q: . If our Sun has a temperature of 6000 K and a luminosity of 1 Solar Luminosity, what is the…

A: A multiple question is given answer for 4 is provided below. Given : Temperature of Sun, Ts = 6000 K…

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.