A star is observed to be thrice the size of the Sun with temperature of 1.3Tsun. Estimate its luminosity.
Q: Many of the bright stars in the night sky are highly luminous normal blue stars (such as Acrux), and…
A:
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: Determine the mean molecular mass of a star for both the scenario of being completely neutral and…
A:
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: require(s) that a young hot star (T ≥ 25,000 K) be relatively nearby.
A: Correct answer is Emission nebula
Q: A star is observed with a surface temperature of 3,000 K and a luminosity of 100,000 solar…
A: Given , Temperature = 3000 K Solar Luminosity = 100,000 Now , mass and luminosity are related by…
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: A newly discovered bright star has a luminosity of 78.4×1026 W. What is its temperature if it has a…
A:
Q: If a neutron star has a radius of 9.12 km and a temperature of 3.63 x 106 K, how luminous is it in…
A: 1)Using stefan's lawP = σ A T4Where P is the power σ is the stefan's constant A is the area of…
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: Calculate the luminosity of an 8 solar mass star.
A: The luminosity of a star is the amount of energy that it radiates per second. It can be considered…
Q: What is the maximum luminosity for star of 5.76×1010 Msun.
A: In hydrostatic equilibrium, the radiation pressure and gravitational force will balance each other.…
Q: At rest, hydrogen has a spectral line at 144 nm. If this line is observed at 168 nm for the star…
A: Given that Hydrogen has a spectral line at λ= 144 nm =10-9m This line is observed at λ'= 168 nm=10-9…
Q: Observations show that stellar luminosity, L, and mass, M, are related by Lx M3.5 for main sequence…
A:
Q: An O8 V star has an apparent magnitude of +2. Use the method of spectroscopic parallax to estimate…
A: The apparent magnitude m of the star is given to be m=+1. From HR absolute magnitude M of a star…
Q: a) What is a binary star system? (b) describe briefly two methods for showing that a system is a…
A: (a) A binary star system is a system of two stars orbiting each other around a common center. Binary…
Q: Calculate the surface temperature of the star Betelgeuse whose λmax is 850 nm
A: Wien's Law of Blackbody Radiation λmaxT = a constant = 3 × 106 where λmax = wavelength of radiation…
Q: White dwarfs have a temperature of 100×103 K. Calculate the maximum wavelength of a White dwarf.
A: A white dwarf is a stellar core remnant that is highly dense and made of electron-degenerate matter.…
Q: You see two variable stars. One has a period of half a day and the other has a period of 100 days.…
A: There are two main types of variable stars – Cepheid and RR Lyrae. The Cepheid stars typically vary…
Q: A neutron star is the remnant left after certain supernovae texplosions of giant stars) Typically,…
A: The density is given by ρ=Massvolume The volume of sphere is 43πR3 It is given that the mass of…
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: The luminosity class of a star tells an astronomer: O how long ago the star formed O whether the…
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 120 Mo star forms with log10 Te = 4.727 and logio (L/Lo) = 6.252, estimate its Eddington…
A: Given: log10Teff/k=4.727 log10L/L⊙=6.252 To Find: Eddington luminosity
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: Find the wavelength of peak intensity for a hot 45000 K star that emits thermal radiation.
A: Given information:Temperature of the object (T) = 45000 K
Q: If a T Tauri star is the same temperature as the sun but is ten times more luminous, what is its…
A: The energy radiated by a star per second is known as its luminosity and is directly proportional to…
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: Calculate the size of a star if its surface temperature is 6000 K and has a power output of 5.6 x…
A: An ideal body capable of absorbing all the radiation that falls on it is considered a blackbody. The…
Q: The flux received at the Earth from Supernova 1885 was 3.0182 x 10 10 W/m?. The luminosity of the…
A: flux (I) = 3.0182×10-10 Wm2luminosity = 6×109 solar luminosities
Q: Choose the statements that correctly describe the characteristics of the stars located in the…
A: Option-E is the correct option.
Q: 7) Calculate the luminosity of a star that has a radius of 4.2Rsun and a temperature of 5Tsun
A: Stars generate an immense amount of energy through fusion. The luminosity of a star or a galaxy is…
Q: Consider two stars with temperatures of 10,000 and 25,000 Kelvin. 3. Calculate the ratio of atoms in…
A: Given: Temperatures are 10,000 and 25,000 Kelvin Energy levels are n=2 to n=1 Statistical weight is…
Q: 1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.
A: Please see the next step for solution:-
- The energy radiated by a star is defined as its luminosity. Luminosity depends on the temperature and hotter stars will be more luminous than cooler stars.
- The luminosity of a star can be defined in terms of the luminosity of the Sun. It is given by,
Here L is the luminosity of the star, LSun is the luminosity of the Sun, R is the radius of the star, RSun is the radius of the Sun, T is the temperature of the star, and TSun is the temperature of the Sun.
Step by step
Solved in 3 steps
- Calculate the luminosity of the star with an apparent magnitude of 2. Given the Sun has an apparent magnitude of -26.57 and 3.9 × 1026 W luminosity.At rest hydrogen has a spectral line at 149nm. If this line is observed at 144 nm for the star proxima how fast is proxima moving in km/sI need the answer as soon as possible
- 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 magnitudef a star has a luminosity of 4*10^26 Watts and a brightness of 1.4*10^3W/m2, how far away is it?A star is observed to have a parallax 0.45". Show that it is a distance of 7.2 LY away.
- A star has a radius of 2RO and has a temperature of 3TO. Calculate the luminosity in solar units.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)RR Lyrae stars have essentially the same luminosity curve, with periods of up to 1 day. False True 47