Explain how some stars form in binary systems.
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: What star is a white dwarf that is much more dim and hotter than the sun. and which type of stars…
A: 1.carbon-oxygen white dwarfs 2. hydrogen- fusing white dwarfs 3. Sirius B 4. Procyon B 5. Stein 2051…
Q: Which of the following is NOT the result of the death of a massive star? Select one alternative:…
A: Hypernova is the type of phenomenon that happens when a massive star collapses into this and results…
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 is least reasonable regarding novae and supernovae? Group of answer choices…
A:
Q: Consider a close binary system composed of a white dwarf, a giant star, and an accretion disk. Which…
A: Given Data: Let us consider the given closed binary system composed of a white dwarf , a giant star…
Q: Put the steps of the life cycle of a star in order.
A: Required : Steps involved in star cycle.
Q: A group of graduate students, bored during a cloudy night at a the observatory, begin to make bets…
A:
Q: What are the approximate spectral type, temperature, absolute magnitude number, and luminosity of…
A: Required : Spectral type, absolute magnitude, temperature and luminosity of star E.
Q: Which of the following is least reasonable regarding a star's position on the HR diagram? Group of…
A: "White dwarfs are small and cool and are located in the lower left part of the HR diagram."This…
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: A 1.5 M neutron star and a 0.7 M white dwarf have been found orbiting each other with a period of 10…
A: The expression for the Kepler’s third law for binary stars is as follows: MA+MB=a3p2…
Q: Which of the following is least reasonable regarding the mass of stars? Group of answer choices…
A: Stars are of different sizes and they have their own set of characteristics based on multiple…
Q: Is this a binary system?
A: Yes. This is a binary system. Specifically this is called a spectroscopic binary system.
Q: 1. The relative velocities of four stars are shown in the figure below with arrows. If an astronomer…
A: Redshift of a light spectra is the phenomenon when we observe an increase in the wavelength and…
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: sequence
A: Hertzsprung-Russell's diagram clearly shows that the star spends most of its life as a main-sequence…
Q: the parallax angle of a star to be 0.002 arc-seconds. what would the distance be to this star?
A: Given, Parallax angle, p=0.002 arc-seconds
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: 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: Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0×10-12 watt/m?.…
A: Luminosity of star (L) = 7×1026 watt Apparent brightness (AB) = 4×10-12 Wm2
Q: The density of Sirius B is 2×106 g/cm3 and its mass is 1.95×1030 kg. What is the radius of the white…
A: The given data are: ρ=2×106 g/cm3=2×109 kg/m3m=1.95×1030 kg Here, ρ and m represent the density and…
Q: Which of these is NOT used as a spiral tracer? a. O stars b. B stars c. young open clusters…
A: Spiral tracers are objects that are commonly found in spiral arms and soare used to trace spiral…
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: 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) (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: What is the total mass of a visual binary system if the average separation of the stars is 8 AU and…
A: A binary system is formed when two astronomical objects come close enough to start orbiting each…
Q: Which of the following stars are bright and very cool
A: The Supergiants are cool stars, which are very large and really bright. they're located towards the…
Q: Q1 (ints): A0620–00 is an X-ray binary system, there is a normal star and a compact object. For the…
A: A binary system in astronomy consists of two astronomical objects two stars or a star and an…


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- A. Based on the graph, what is the approximate mean luminosity of a Cepheid variable star with a period of 5 days? 10 days?Hi! I just need help with the part circled in red. Thank you!You've just discovered a new X-ray binary, which we will call Hyp-X1 ("Hyp" for hypothetical). The system Hyp-X1 contains a bright, 82 main- sequence star orbiting an unseen companion. The separation of the stars is estimated to be 23 million kilometers, and the orbital period of the visible star is 4 days Part C Determine the mass of the unseen companion.(Hint A main-sequence star with spectral type B2 has a mass of about 10M) Express your answer as a multiple of Sun's mass to two significant figures. Musso Submit Part D Request Answer | ΑΣΦ Is it a neutron star or a black hole? black hole neutron star ? Mun
- 1:Which star has been redshifted the most? 2:Which star is moving towards us the fastest? Star C Star D Star A Star B 3:The wavelength of this spectral feature is measured to be 600nm in the lab, and 609 in Star A. What is the radial velocity of Star A? using km/s,please explainA turnoff point corresponding to the youngest star cluster would occur at what spectral classification? a. B b. A c. F d. G
- The mass-luminosity relation describes the mathematical relationship between luminosity and mass for main sequence stars. It describes how a star with a mass of 4 M⊙ would have a luminosity of ______ L⊙. If a star has a radius 1/2 that of the Sun and a temperature 4 that of the Sun, how many times higher is the star's luminosity than that of the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125) If a star has a radius 2 times larger than the Sun's and a luminosity 1/4th that of the Sun, how many times higher is the star's temperature than that of the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125) If a star has a surface temperature 2 times lower than the Sun's and a luminosity the same as the Sun, how many times larger is the star than the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125)Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFFF). A) White dwarfs are small dense objects about the size of the Earth. B) White dwarfs are composed mostly of hydrogen. C) A planetary nebula forms when a star violently explodes. D) A planetary nebula is the remnant of the outer envelope of a star. E) A white dwarf is the remnant of the star's core visible after the outer layers have been ejected.Assume that when a certain main sequence star becomes a giant gas, its luminosity increases from L to 1000 L and its radius also increases from R to 1000 R. If the initial surface temperature is T, what approximately is the final surface temperature? A. 0.032 T B. 0.18 T C. 0.0010 T D. 0.010 T