1) How are luminosity, mass and temperature of a star related?
Q: Which of the following accurately describes why massive stars can no longer fuse elements at their…
A: It is asked, which of the following accurately describes why massive stars can no longer fuse…
Q: 2. Explain the different mechanisms that power the internal heating of a giant star, a main sequence…
A: Question : Explain the different mechanisms that power the internal heating of 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: 8) Star A has an apparent magnitude of 2.5 and star B has an apparent magnitude of 3.9. Calculate…
A: When studying stars astronomers use two different magnitudes, apparent and absolute magnitude.…
Q: 2) What happens when one of the star ina binary system becomes a black hole.
A: Binary systems are two astronomical bodies that orbit each other around a common center of mass. If…
Q: A star has a temperature T = 15000K, mass M = 0.25M⊙ and luminosity L = 0.02L⊙. Sketch the position…
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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: 1. Using the observed (apparent magnitude) light curve for a Cepheid variable shown below, estimate…
A: Given is a plot between the apparent magnitude mV and the period in days plot So first from the…
Q: Determine the mean molecular mass of a star for both the scenario of being completely neutral and…
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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: 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: 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: . How does the H-R digram of a given star cluster change as the cluster ages?
A: HR Diagram : Note : Blue color indicates the hottest stars and red color represent the…
Q: mass–luminosity relation
A: The Answer to the above statement can be outlined as follows:-
Q: 12) Calculate the absolute magnitude of a star with a luminosity of 3.2L-sun-
A: The absolute magnitude defines how bright a star would be if it was observed from a distance of 10…
Q: Brown dwarfs are ____. a. stars with a very thick dust sphere around them, so they appear “brown”…
A: Required : Correct option.
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: Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…
A: 1. Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…
Q: . The spectrum of Star A peaks at 700 nm. The spectrum of Star B peaks at 470 nm. We know nothing…
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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: Sirius, the brightest star in the sky has a parallax of 0.379 arcsec What is its distance in…
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Q: a) (Palen, et. al., 2nd, Problem 45) Rigel has a Hipparcos parallax of 0.00412 arcsec. Given Rigel…
A: Rigel and Betelgeuse are located in the constellation of Orion, which are about 864.3 and 642.5…
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: What is the escape velocity (in km/s) from the surface of a 1.6 M, neutron star? From a 3.0 Mo…
A: The mass of the Sun, M⊙=1.99×1030 kg The radius of the neutron star, r=11 km
Q: The luminosity class of a star tells an astronomer: O how long ago the star formed O whether the…
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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: Part D By how much? ΑΣΦ LM=-2 100000000 %3D LM=8 Submit Previous Answers Request Answer
A:
Q: subject: astronomy) 1. When do you say a star is very hot compared to the red. 2. are stars of equal…
A: Answer (1) A blue star will always be hotter than the red star. It is independent of the relative…
Q: a) Sketch a generic HR diagram, including labels for the axes. (Take a picture or scan your work and…
A: a) HR diagram is,
Q: 7. Let's characterize a typical neutron star. (a) Compute its luminosity in units of the solar…
A: The neutron star has a surface temperature of 106 K and a radius of 7 km One solar luminosity is…
Q: List the seven main classes of stars, from hottest to coolest.
A: The hottest stars are denoted by the letter O, with the sequence progressing through B, A, F, G, K…
Q: What do these three nebulae have in common? NOTE: There are multiple correct answers. Select all…
A: (1) As we know that Nebulae are made of dust and gases mostly hydrogen and helium. (2) The dust and…
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…
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- The white dwarf that remains when our Sun dies will be mostly made of A. helium. B. carbon. C. neutrons. D. hydrogen. Is the answer B? Thanks!1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.3- Consider a binary star system in which the two stars are seen to be 1.50" apart. Determine the actual physical separation of those stars (in AU) if this binary system is located 9.50 1.y. from us.
- 31) Star Sirius has an apparent magnitude of -1.47 and an absolute magnitude of 1.41. Estimate the distance to Sirius.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 magnitudeMatch each characteristic below to the appropriate stellar end state. (Select W-White dwarf, N-Neutron star, B-Black hole. If the first is W and the rest N, enter WNNNNNNN). A) Has a mass no greater than 1.4 solar-masses. B) Sometimes appears as a pulsar. C) Size defined by its Schwarzschild radius. D) In a binary system it can explode as a supernova. E) Supported by electron degeneracy pressure. F) Typically about the size of Earth. G) Usually has a very strong magnetic field. H) Viewed from afar, time stops at its event horizon. Answer: Submit All Answers
- 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)1112 Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond. The distance to this star is A) 2 parsecs. B C 0.5 parsec. E 5 light-years. (D) 5 parsecs. 0.5 light-year.
- 6) Estimate the distance to the star with absolute magnitude -5.6 and apparent magnitude 0.75Which of the following binary star systems cannot exist? A. A 1 solar-mass main sequence star and a 4 solar mass red giant with a size 100 times smaller than the orbital distance. B. A 15 solar-mass main sequence star and a 10 solar mass red giant with a size 100 times smaller than the orbital distance. C. A 1 solar-mass main sequence star and a 4 solar-mass main sequence star. D. A 2 solar-mass main sequence star and a 1 solar mass red giant with a size a few times smaller than the orbital distance.