How would astronomers use spectra A, B and C to precisely calculate how fast the star...

How would astronomers use spectra A, B and C to precisely calculate how fast the star was moving? How would the speed the star is moving allow astronomers to be able to deduce information about the orbiting planet? What type of information could the astronomers calculate?

Expert Solution

Ans: A star with a planet will move in its own small orbit in response to the planet's gravity. This leads to variations in the speed with which the star moves toward or away from Earth, i.e. the variations are in the radial velocity of the star with respect to Earth.

The planet and star are both orbiting a shared center of mass. If the orbit is edge-on, the star will move towards us and then away from us in its tiny orbit. When an object is moving towards us, the light we detect is blue-shifted (we see the light at shorter wavelengths than normal) and when an object is moving away from us. the light we detect is red-shifted (we see the light at longer wavelengths than normal).

The Doppler shift for light is very similar to the Doppler shift for sound which you have probably witnessed if you've ever stood on the side of the road when an ambulance passed by. The ambulance’s sirens sound different when they are approaching than when they are receding because the sound waves are compressed and then stretched.

These changes in the star's spectrum (a plot of brightness coming from the star versus wavelength) due to the Doppler shift can be detected. This method has detected a good portion of all discovered extrasolar planets.

In order to locate position in space we need at least there different reference points that is here three spectra will help to locate it's position precisely.

genius_generous answered 4 months ago

Spectra are taken of two stars in a binary system: Star A and Star B. Every...

Spectra are taken of two stars in a binary system: Star A and Star B. Every 1.56 days, the H? line in star A goes from 2.5 ?A blueward of its rest (laboratory) wavelength to 2.5 ?A redward then back to 2.5 ?A blueward. The H? line in star B also cycles through shifts redward then blueward and back to redward with respect to the rest (laboratory) wavelength of H? every 3.96 days but its maximum deviation from the rest...

a) Explain what is meant by UBV filters. b) Explain why astronomers would want to use...

a) Explain what is meant by UBV filters. b) Explain why astronomers would want to use such filters. c) Give an example of the usage of UBV filters.

Explain how stellar spectra can be used to determine the following: A) temperature B) composition C)...

Explain how stellar spectra can be used to determine the following: A) temperature B) composition C) radial velocity

Define a relation ~ on Z x Z such that (a,b) ~ (c,d) precisely when a...

Define a relation ~ on Z x Z such that (a,b) ~ (c,d) precisely when a + b = c + d. Let R = {[(a,b)] : (a,b) in Z x Z} (i.e. R is the set of all equivalence classes of Z x Z under the equivalence relation ~). For each of the following operations, determine whether or not the operation is well defined. Prove your answer. [(x,y)] * [(w, z)] = [(x + w, y + z)] [(x,y)]...

Star A is 3.2 times hotter than Star B. How many times brighter is Star A...

Star A is 3.2 times hotter than Star B. How many times brighter is Star A than Star B? According to the Stefan-Boltzmann Law, a larger star will appear _________ than a smaller star of the same temperature. brighter bluer redder fainter What is the peak wavelength of light coming from a star with a temperature of 4,300 K? (Submit your answer in nanometers. Remember 1nm = 10-9 m) Sitting on the table is a red...

3. What benchmark would you use to calculate materiality? Why? ((a)Net Income, (b) Assets, (c) Revenue,...

3. What benchmark would you use to calculate materiality? Why? ((a)Net Income, (b) Assets, (c) Revenue, or (d)Equity.) (Pick 1 letter & Explain why) a. 5 percent to 10 percent of net income before taxes. b. ½ percent to 1 percent of total assets. c. ½ percent to 1 percent of total revenues. d. ½-1 percent of total equity. 4. Would you use a higher percentage or a lower percentage for the benchmark you selected in Q3 above. (EX: 5%...

How would you design an experiment to precisely measure the force and the position of charges...

How would you design an experiment to precisely measure the force and the position of charges and verify Coulomb's law for electrostatics? Briefly note what the problems are with the one you did and then offer ideas on ways it could be done precisely. please answer both parts

Use boolean algebra to prove that: (A^- BC^-) + (A^- BC) + (A* B^- *C) +...

Use boolean algebra to prove that: (A^- *B*C^-) + (A^- *B*C) + (A* B^- *C) + (A*B* C^-) + (A*B*C)= (A+B)*(B+C) A^- is same as "not A" please show steps to getting the left side to equal the right side, use boolean algebra properties such as distributive, absorption,etc

Part A Calculate the number of C atoms in 0.602 mole of C. Part B Calculate...

Part A Calculate the number of C atoms in 0.602 mole of C. Part B Calculate the number of SO2 molecules in 6.82 moles of SO2. Part C Calculate the moles of Fe in 2.34x1022 atoms of Fe. Part D Calculate the moles of C2H6O in 3.97x1024 molecules of C2H6O.

1. a) What happens in a star when it follows the Hayashi track? b) Estimate (calculate)...

1. a) What happens in a star when it follows the Hayashi track? b) Estimate (calculate) how long a 2 Msun star will take to reach the “bottom” of the Hayashi track. Be sure to explain, and justify, any assumptions that you make. To answer this question, you should perform a calculation, do not just read off the time from a figure.

Question