Why are red dwarfs very dim.
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: All stars start their lives with the same basic composition. What determines their differences? O…
A: Mass they formed with
Q: A red giant star might have radius = 104 times the solar radius, and luminosity = 1730 times solar…
A: This problem can be solved using Stefan-Boltzmann law of Black body radiation.
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: What is an emission nebula?
A: The space between stars and galaxies is filled with clouds of gas and dust. These clouds of gas and…
Q: The surface of a star usually has the highest temperature O True O False
A:
Q: Why are metals less abundant in older stars than in younger stars?
A: Answer: The metals which basically are non hydrogen and helium material are produced or created in…
Q: Stars begin their life cycle in a O black hole O nebula O nova O supernova
A: Answer:) star begin their life cycle in a nebula
Q: A star has a temperature T = 15000K, mass M = 0.25M⊙ and luminosity L = 0.02L⊙. Sketch the position…
A:
Q: A pulsating variable star with a period of 10 days would be a Cepheid having an absolute magnitude…
A: Pulsating variable star are made by expansion and contractions in the outer layers of any stars. Due…
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: Describe the evolution of a very low mass start a red dwarf, birth to death
A: Answer Low mass stars in their dating stages shed their outer layers transfer most of their mass…
Q: The Orion Nebula is a gas-rich region in which stars are being born. The nebula is at a distance of…
A: Let us first convert the given distance (D) between nebula and earth from light year to parsecs :…
Q: Put the steps of the life cycle of a star in order.
A: Required : Steps involved in star cycle.
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: where do hydrogen-buring stars spend most of their time on the H-R Diagram? Is it the main sequence,…
A: Hydrogen burning stars are those stars which burns hydrogen as their dominant fuel. Horizontal…
Q: Calculate the luminosity of an 8 solar mass star.
A: The luminosity of a star is the amount of energy that it radiates per second. It can be considered…
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: Astronomy) (Part A) White Dwarf Size II. The white dwarf, Sirius B, contains 0.98 solar mass, and…
A: Mass of the dwarf planet = 0.98 solar mass = 1.96 * 1033 gm…
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: 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: A white dwarf star has a visual luminosity of 0.046LSun. If you were 1 AU from the white dwarf, what…
A: Ldwarf = 0.046Lsun Distance d = 1 AU = 1.496×1011 m Lsun = 3.827×1026 W
Q: The percentage of helium used immediately during a star’s helium flash phase is
A: It is a very brief phase
Q: What is the luminosity, in solar units, of a brown dwarf whose radius is 0.1 solar radii and whose…
A: Luminosity of a star or an object is the total amount of energy radiated per second by that object.…
Q: Why does the luminosity of a star depend on both its radius and its temperature?
A: Luminosity is the radiant power emitted by star. The luminosity is measured in Watt or Joules per…
Q: Why massive stars are short lived?
A: A massive star has a shorter life spanthan an average star because of fasterhydrogen fuel…
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: 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: Why do distant stars look redder than their spectral types suggest?
A: The pace is mostly empty but there are areas of large density of the interstellar medium. It…
Q: The luminosity class of a star tells an astronomer: O how long ago the star formed O whether the…
A:
Q: Why don't red dwarfs become giant stars?
A: Red dwarf stars or M-type stars are small stars with a mass of 0.08 to 0.6 times the mass of the…
Q: Why does the orbital period of a binary star depend on its mass?
A: A binary system is formed when two massive astronomical objects start orbiting each other around a…
Q: If a T Tauri star is the same temperature as the sun but is ten times more luminous, what is its…
A: The energy radiated by a star per second is known as its luminosity and is directly proportional to…
Step by step
Solved in 3 steps
- Hertzsprung-Russell Diagram Blue or blue white White Vellow Red orange Red ORian Superglants Beleigrre Main Sequence Alderaron Glants Alpho Cetaut. E Sirius White 5,000 3,000 10,000 Surface Temperature ("C) 50.000 20.000 6,000 What is the color of the stars shown on the diagram that have the lowest surface temperature? O red O yellow O blue O white Brightness IncreasingCalculate the absolute magnitude of a star at a distance of 6 pc with an apparent magnitude of 3.What is the size of a typical white dwarf? Group of answer choices 1.0 solar radii 0.5 solar radii 0.1 solar radii (roughly the size of Jupiter) 0.01 solar radii (roughly the size of Earth) 5 solar radii
- 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.Match the spectral type and luminosity class to theletters shown on the Hertzsprung-Russell diagram 1) A WD (White Dwarf)2) G V (Main Sequence) 3) M V (Main Sequence)4) M I (Supergiant)5) G III (Giant)In which component of the interstellar medium do new stars form? O molecular clouds O HII intercloud medium OHI clouds OHI and molecular clouds O hot coronal gas
- Two stars with the same luminosity form a close binary pair. Show that when they are observed together, the combined apparent magnitude is 0.75 mags less (i.e. brighter) than the sum of the individual magnitudes.Why do old stars have less metal compared to new ones?Indicate whether the following statements are true or false (Select T-True, F-False. If the first is T and the rest are F, enter TFFFF) A) A planetary nebula forms when a star violently explodes. B) White dwarfs are composed mostly of hydrogen. C) A white dwarf is the remnant of the star's core visible after the outer layers have been ejected. D) A planetary nebula is the remnant of the outer envelope of a star. E) White dwarfs are small dense objects about the size of the Earth.
- What are the two possibilities for the final state of a close, massive binary system?The total luminosity of a binary pair is 3.5x1028 Watt. What is its absolute magnitude? Round your answer to two significant figures.An eclipsing binary will a. be more luminous than a visual binary. b. always be a spectroscopic binary. c. give off most of its light in the infrared. d. show a constant Doppler shift in its spectral lines. e. show two stars with variable proper motion.