Question 1. A star has a parallax 0.043 arcsec and an apparent magnitude m = 7.8....
Question 1. A star has a parallax 0.043 arcsec and an apparent magnitude m = 7.8. Calculate its distance (parsec) and luminosity. Express the luminosity in watts and as a percentage of the solar luminosity.
Homework Answers
Therefore,
Therefore expressing the luminosity we found as a percentage of solar luminosity we get,
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Question 1. A star has a parallax 0.043 arcsec and an apparent
magnitude m = 7.8....
Question 2. The supergiant star Rigel has a parallax 3.78 mas, apparent magnitude m = 0.1,...
Question 2. The supergiant star Rigel has a parallax 3.78 mas, apparent magnitude m = 0.1, and surface temperature T = 12,100 K. Calculate its: distance [parsec] luminosity [solar units], radius [solar radii]
1. A star has a parallax of 0.324 arcseconds and apparent magnitude in V-band m= +1.55....
1. A star has a parallax of 0.324 arcseconds and apparent magnitude in V-band m= +1.55. Later observations reveal that the “star” is actually a close binary, with members star 1 and star 2. Star 1 is found to have mı = +1.83. (a) Find the apparent magnitude of star 2, m2. [2 marks] (b) What is the ratio of the V-band flux received from star 1 to that received from star 2? (c) Find the distance to the system...
The star Sirius has an apparent magnitude ?V = −1.46 and a parallax ? = 0.37921”.(a)...
The star Sirius has an apparent magnitude ?V = −1.46 and a parallax ? = 0.37921”.(a) Calculate its distance and absolute magnitude. (b) What would Sirius’ parallax be if it were measured from an observatory on Neptune’s moon Triton as Neptune orbited theSun?
1) If a star has an apparent magnitude of -0.4 and a parallax of 0.3”, what...
1) If a star has an apparent magnitude of -0.4 and a parallax of 0.3”, what is a) the distance modulus and b) the absolute magnitude?
I need question 6 5. Stellar Parallax and a Parsec (15 pts.) A star with l...
I need question 6
5. Stellar Parallax and a Parsec (15 pts.) A star with l arcsecond parallax angle (0) it is definedto be 1 parsec away. Let's calculate the value of a parsec. Examine the diagram below. When viewed from the two positions (3 months apart), the star's position shifts by the angle e. Sun Earth Star (a) What is the distance (a) in km? (b) The distance (b) can be derived from trigonometry, tan(6) -alb. What is the...
9) How distant is a star whose modulus is -7.5? 10) If its apparent magnitude (m)...
9) How distant is a star whose modulus is -7.5? 10) If its apparent magnitude (m) = +13.5 and absolute magnitude (M) = +10, what is the distance to a star? PROBLEMS TO COMPLETE FOR PARALLAX 11) A star has a parallax of .025 seconds of arc—what is its distance in parsecs? The nearest star has a parallax of 76 arc seconds—what is its distance in light years? 12) If star were 2.40 pc from Earth, what would its distance...
A star of apparent magnitude 13.0 lies 600 pc from Earth. If interstellar absorption results in...
A star of apparent magnitude 13.0 lies 600 pc from Earth. If interstellar absorption results in an average extinction of 2.0 mag/kpc, calculate the star's absolute magnitude and luminosity Express your answer using two significant figures. IVO AEO ? M=
The Hipparcos satellite, which has given us most of our best modern measurements of parallax, has an uncertainty in its measurements of the parallax angle of 0.001". For a star with a paralla...
The Hipparcos satellite, which has given us most of our best modern measurements of parallax, has an uncertainty in its measurements of the parallax angle of 0.001". For a star with a parallax of 0.004" what is the distance to the star? What is the uncertainty in that distance? What is the percentage uncertainty? At what distance is the distance uncertainty 10%
The Hipparcos satellite, which has given us most of our best modern measurements of parallax, has an uncertainty...
3. [9 marks] You have access to a small professional telescope that is able to record...
3. [9 marks] You have access to a small professional telescope that is able to record the ultraviolet through infrared spectrum of a star in the constellation of Orion. You determine that the wavelength of light at the peak of the spectrum is 922.93 nm. The star’s apparent magnitude is m = 0.45. a) [2 marks] Determine the star’s surface temperature in units of Kelvin (K). b) [3 marks] Using the solar constant and the Sun’s apparent magnitude, determine the...
A star has apparent magnitude 10.0 and absolute magnitude 4.5. How far away is it? Express...
A star has apparent magnitude 10.0 and absolute magnitude 4.5. How far away is it? Express your answer using two significant figures.
I need question 6
5. Stellar Parallax and a Parsec (15 pts.) A star with l arcsecond parallax angle (0) it is definedto be 1 parsec away. Let's calculate the value of a parsec. Examine the diagram below. When viewed from the two positions (3 months apart), the star's position shifts by the angle e. Sun Earth Star (a) What is the distance (a) in km? (b) The distance (b) can be derived from trigonometry, tan(6) -alb. What is the...
9) How distant is a star whose modulus is -7.5? 10) If its apparent magnitude (m) = +13.5 and absolute magnitude (M) = +10, what is the distance to a star? PROBLEMS TO COMPLETE FOR PARALLAX 11) A star has a parallax of .025 seconds of arc—what is its distance in parsecs? The nearest star has a parallax of 76 arc seconds—what is its distance in light years? 12) If star were 2.40 pc from Earth, what would its distance...
A star of apparent magnitude 13.0 lies 600 pc from Earth. If interstellar absorption results in an average extinction of 2.0 mag/kpc, calculate the star's absolute magnitude and luminosity Express your answer using two significant figures. IVO AEO ? M=
The Hipparcos satellite, which has given us most of our best modern measurements of parallax, has an uncertainty in its measurements of the parallax angle of 0.001". For a star with a parallax of 0.004" what is the distance to the star? What is the uncertainty in that distance? What is the percentage uncertainty? At what distance is the distance uncertainty 10%
The Hipparcos satellite, which has given us most of our best modern measurements of parallax, has an uncertainty...
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