star A and star B are both on the main sequence. star A is 56 times more luminous than star B. what is the ratio of their main-sequence lifetimes? refer to the stellar life expectancies equation
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star A and star B are both on the main sequence. star A is 56 times more luminous than star B. what is the ratio of their main-sequence lifetimes? refer to the stellar life expectancies equation
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- Shown are three main sequence stars. Each one is a different size, but the color is not shown. Rank from longest to shortest the total amount of time it was a protostar before it was a main sequence star. A ? O Longest AC B Shortest O Longest BCA Shortest O Longest A B C Shortest B ? ? C All the stars would be a protostar for the same amount of timeHow many times hotter than our sun is the hottest type O star, which has a surface temperature 40,000 K? Number times hotter =Which of the following stars has the highest surface temperature? Treat the star as a blackbody. a)A dim red star b)A bright red star c)A bright orange star d)A dim orange star e)A bright yellow star
- A red giant star has a temperature of 3900 K and a luminosity of 13600 LSun. How many times bigger is this star than the Sun? Hint: You need the surface temperature of the sun for this problem. Use the value in the book, 5800K.List the following 5 terms in order through a stars life cycle (starting with the sun), through the remainder of its lifetime: a. Black dwarf b. Planetary nebula c. Red giant d. Star (Sun) e. White dwarfwhat is the mass of a star with a main- sequence lifetime of 3 billion years
- In the star clusters shown, which one is younger and why?What is the mass of a star with a main-sequence lifetime of 6 billion years?Identify the location in the H-R diagram of the phases of stellar evolution. (For each statement select the proper symbol in the picture.) 1) red giant, helium flash2) white dwarf3) red giant with helium burning shell4) hydrogen fusion in shell around core5) helium fusion in core6) envelope ejected, planetary nebula7) main-sequence star8) helium used up, core collapses9) hydrogen used up, core collapses
- Consider two stars on the main sequence, A and B. Star A has a mass of 4 M⊙. Star B has a mass of 0.8 M⊙. By what factor is the luminosity of star A greater than the luminosity of star B?A star is listed in a catalog as being a type G2V.a) What is the star’s spectral class?b) What is the star’s luminosity class?c) What is the peak color of the star?d) Name an example of a star that has this type.The figure above shows a track on the H-R diagram corresponding to the evolution of a star like the one you’ve just considered. Six stages are numbered. Six stages of stellar evolution are listed below – for each stage, write the number corresponding to its position on the diagram (four of these stages are the same stages you considered in the first part of this tutorial). Horizontal branch: Asymptotic giant branch: White dwarf: Main sequence: Planetary nebula: Red giant branch: What is the approximate mass of this star, in solar masses? Explain how you can tell.