13) Calculate the luminosity in watts from the absolute magnitude for the given stars: (a) Sun (M = 4.83)
Q: Many of the bright stars in the night sky are highly luminous normal blue stars (such as Acrux), and…
A:
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: Hertzsprung-Russell Diagram Blue or blue white White Yellow Red orange Red Superglants beleignne…
A: In this problem, it is asking about the brightest star.
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: The surface of a star usually has the highest temperature O True O False
A:
Q: Given a 10 Jy source with an occupying 15'' in the sky, at a distance of 1.1 Mpc, observed at 1.4…
A:
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: Hertzsprung-Russell Diagram Blue or blue w White Vellow Red orange Red Rioe Supergl Beteigeuse Main…
A: The region of main sequence contains large number of stars than any other region. Therefore most 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: 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: Hertzsprung-Russell Diagram Bhe or bhue white White Vellow Red orange Red ORigel Superglants…
A:
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: 4. Calculate the number density of the negative Hydrogen ion (H-), relative to neutral Hydrogen in…
A:
Q: To find the Sun’s luminosity from its brightness using the inverse-square law, you also had to be…
A: The distance to the sun can be calculated using the method of parallax. Parallax is defined as the…
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: 13) Calculate the luminosity in watts from the absolute magnitude for the given stars: (a) Vega (M =…
A: The energy radiated per unit of time by an astronomical object is called luminosity. The…
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: If the Sun's distance were three times its current distance, the "surface brightness" (apparent…
A: Distance is increased by 3 times That means r= 3R R is the initial distance
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: Problem 7. Assume that a star can be approximated as a black body, using Stefan's Boltzmann Law 1.…
A:
Q: Using the proportionality relationships for stellar luminosity as a function of mass and stellar…
A: Stellar lifetime is directly proportional to Stellar mass. Stellar luminosity is inversely…
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: 2) A very rough estimate for a star is given by the density profile: p1) = P. (1-) where p, is the…
A:
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: 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: Explain how we can determine the temperature of a star without going there.
A: Stars can be considered a blackbody. The energy released in the core of the star will be absorbed by…
Q: 4) Why infrared is preferred to observe the stars around Sgr A*?
A: There are molecules of gas and dust in interstellar space. They are sent out when a star dies.…
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: Distances to the nearest stars (up to 500 ly away) can be measured by a technique called parallax,…
A: The distance between the Sun and the Star is given as, dS = 4 light year (or) dS = 3.784×1013 km 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: If the scattering material is purely ionised hydrogen, what is the Eddington Luminosity for a…
A: For a scattering material of mass M that is consisted of purely ionized hydrogen, the Eddington…
Q: If the Sun was producing its energy by slow contraction as suggested by Helmholtz and Kelvin,…
A: The Kelvin–Helmholtz mechanism is the process by which the surface of a star or planet cools which…
Q: (1) How and why does the strength of the hydrogen absorption lines vary between stars of different…
A:
Q: 1) How are luminosity, mass and temperature of a star related?
A:
Q: 7) The H-alpha line from a star is observed to be 850 nm. Estimate its redshift
A:
Q: Compute the distance to the following stars using the luminosity-distan relationship: m-M=5 log (d)…
A: Apparant Magnitude (m) = 9.95Absolute Magnitude (M) = 0.75
Q: 50,000 20,000 Surface Temperature (C) Would the surface temperature of the stars classified as white…
A: Surface temperature of white dwarfs is around 20000K And for giant it is 2500 to 4000K
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: 1. Spectral signatures can be described using luminosity values in different spectral regions. UV…
A: Yes, it is possible to separate the different categories based on the values in given table because…
Q: bol = 7.77. What is th
A: Given: To find the Proxima Centauri absolute magnitude is given as,
- Luminosity can be defined as an absolute measure of radiated power emitted by a light source over time. In astronomy, it gives us the energy emitted per unit of time by a star, galaxy, or any other astronomical object.
- Absolute magnitude is a measure of luminosity. It defines how bright a star would be if it was observed from a distance of 10 pc.
- The relationship between absolute magnitude and luminosity is given by,
Here L is the luminosity of the star and L0 is the zero-point luminosity and has a value of 3.0128 × 1028 W.
Step by step
Solved in 3 steps
