Which main-sequence star would be the least luminous?   a. G1   b. G5   c. G9   d. F0   e. F3

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: a. In which cluster(s) would you not expect to find a white dwarf? List all that apply. b. You…

A: for the white dwarf : If the star has a mass less than 1.44 of the sun's mass, it becomes a white…

Q: Where does gold (the element) come from? A. It is produced during the supernova explosions of…

A:

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: 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: 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: 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: 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: . 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: The gas and dust cocoon surrounding young stars   a. is blown away when the young stellar surface…

A: In the initial stage of star formation i.e protostar phase the young star is surrounded by dust and…

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: Brown dwarfs are ____. a. stars with a very thick dust sphere around them, so they appear “brown”…

A: Required : Correct option.

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: A helium flash occurs a. because helium is very explosive and cannot be controlled when the…

A: Required : Why does the helium flash occur.

Q: Which type of star would be the largest? a. M b. O c. B d. K e. A

A:

Q: . Imagine a giant sphere with a radius of 1 AU surrounding the Sun. What is the surface area of this…

A: "Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

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: The approximate relationship between the luminosity and the period of Cepheid variables is Lstar[in…

A:

Q: You discover a binary star system in which one member is a 15 solar-mass main-sequence star and the…

A: Required : The correct option.

Q: Stars A and B both have the same spectral class. Star A is 7 times farther away than star B. The…

A:

Q: Based on what you know about main-sequence stars, select all of the correct statements from the…

A: Required : Correct statements .

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: Stars are born in   a. reflection nebulae.   b. dense molecular clouds.   c. HII regions.   d.…

A: Option (B): Dense molecular cloud.

Q: Hypernovae are thought to be   a. a star greater than 20 solar masses collapsing into a black hole.…

A: A hypernova is a type of supernova but having more energy  Hypernova contains a tremendous amount of…

Q: Which stars have the longest period of variability?   a. RR Lyrae   b. Type I (classical) Cepheids…

A: Variable stars: Variable stars are the stars that change their apparent magnitude. There are two…