The most luminous main-sequence stars are spectral class a. A. b. O. c. G. d. M.
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: Absolute visual magnitude is a. the apparent magnitude of a star observed from Earth. b. the…
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Q: 1. The stellar parameter that best determines a star's location on the main sequence is: Select one:…
A: 1. The stellar parameter that best determines a star's location on the main sequence is: c. mass…
Q: Which of the following can explain how we can calculate distances to stars despite being able to…
A: Parallax is a technique used to measure the distance to a star by observing its apparent shift in…
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: The Messier Catalog is a. a listing of all the stars within the Local Bubble b. a list of all the…
A: The Messier catalog is a list of 110 commonly found objects in the night sky that can be easily…
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: What kind of star is most likely to become a white-dwarf supernova? A. a star like our Sun B. a…
A: There are gas and dust particles in outer space when their mass increases they will start attracting…
Q: The approximate diameter of the disk of the Milky Way is a. 8.0 A.U. b. 8.0 light-years. c.…
A: To determine diameter of the disk of the milky way
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: A light curve measures a. luminosity vs. temperature. b. mass vs. luminosity. c. diameter…
A: A light curve is a graph that shows the brightness of an object over a period of time.
Q: Doppler broadening of spectral lines. Given that K= (1+vx/c), then Arms is: O a. b. KT/mc
A: Given that λ=λo(1+VxC). Then to find λrms is given below.
Q: Once carbon builds up in the Sun's core, astronomers expect our Sun to first become a red giant,…
A: Our sun is an average mass star in the main sequence. The life cycle of average main sequence star…
Q: Which of the following spectral classes has stars with the hottest temperature? a. F0 b.…
A: Here given the stars with spectral classes.We have to find the stars which is hottest.
Q: Which type of star would be the largest? a. M b. O c. B d. K e. A
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Q: Suppose a spectral line from an object in space was shifted from 5007.0 to 5100.0 Angstroms. What…
A: Given that: A spectral line from an object in space was shifted from 5007.0 to 5100.0 Angstroms.…
Q: Calculate the distance of a star if the stellar spectrum indicates an absolute magnitude of -10.0,…
A: Given,Absolute magnitude, M =- 10Apparent magnitude, m = 5From magnitude distance formula,m -M = 5…
Q: From its spectral type, the surface temperature of a main sequence star is measured to be about…
A: Using the 1r2 rule method, we can find out the star's distance by measuring the intrinsic brightness…
Q: Which of the following WOULD NOT characterizes the type(s) of star we would find at g, m, n, o, and…
A: The Hertzsprung-Russell (H-R) diagram is a graph that plots the luminosity (or absolute magnitude)…
Q: Stars A and B both have the same spectral class. Star A is 7 times farther away than star B. The…
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Q: The first stars to form in our galaxy a. had circular orbits. b. had highly elliptical…
A: Population 1 stars are the newer and younger stars.
Q: A turnoff point corresponding to the youngest star cluster would occur at what spectral…
A: The turnoff point of a star is the point where it leaves the main sequence of the HR diagram after…
Q: 5. The Luyten 762-8 star system contains two stars, one with apparent 12.5 and the other with m =…
A: Given : mVega =0 , m1 = 12.5 and m2 =12.9 Concept : mVega - m = 2.5 log(L/LVega)
Q: How high or low a star is on the main sequence is dictated primarily by ... Select one: A. its…
A: Answer: A high or low a star is on the main sequence is dictated primarily is discussed below:
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A.
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| b. |
O.
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| c. |
G.
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| d. |
M.
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