Star A has a V-band magnitude of 5. Star B also has a V-band magnitude of...
Star A has a V-band magnitude of 5. Star B also has a V-band magnitude of 5. What is the V-band magnitude if you observe A and B in superposition (assuming the two stars are not in occultation of each other)?
The answer is 4.25 but I'm not sure how. Please show all calculations.
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Star A has a V-band magnitude of 5. Star B also has a V-band
magnitude of...
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...
Star A has magnitude 2 and star B has magnitude 3. Which star is brighter? A...
Star A has magnitude 2 and star B has magnitude 3. Which star is brighter? A or B What is the ratio of brightness we observe?
5. A globular cluster has a total of 109 stars. 100 of them have a V-band...
5. A globular cluster has a total of 109 stars. 100 of them have a V-band magnitude of M,=0 and the rest have My = +5.0. What is the integrated absolute magntiude of the cluster? combined m m = -2,5109 (La) (a) ma-M=51098d) & is 4
Hi! So this table on the picture has star information needed. the queastion is: “A star...
Hi! So this table on the picture has star information needed.
the queastion is:
“A star whose apparent magnitude and absolute magnitude are
identical is licated at 10 persecs away from us (by definition).
Star C is at 10 pc. Of the other four stars, rank them from
closest, closer, farther, farthest. (HINT: figure out if a star
would be brighter or dimmer IF it were located at 10
persecs.)”
So on second picture were my answers, and i got...
a) An Sb galaxy has an absolute magnitude in the B band of -20.21. i) Estimate the isophotal radius at 25 B - mag arcsec...
a) An Sb galaxy has an absolute magnitude in the B band of -20.21. i) Estimate the isophotal radius at 25 B - mag arcsec−2 . ii) Estimate the rotational velocity of the galaxy. iii) Estimate the angular rotation speed of a star at the isphotal radius in arsec yr−1 PLEASE HELP!
1. If you look at the CMD of NGC 6397 in the lower-right corner, what are...
1. If you look at the CMD of
NGC 6397 in the lower-right corner, what are the stars there? There
are no stars here fainter
than I = 25. Why do you think this is? What is it telling
us?
2.If you look at the CMD of NGC 6397 in the lower-left corner,
what are the stars there? There are no stars here fainter
than I = 28. Why do you think this is? What is it telling
us?
The...
6 1. A red photon has a wavelength of 660 nm. How fast must a star...
6
1. A red photon has a wavelength of 660 nm. How fast must a star be moving toward the Earth for a red photon emitted by the star to change its color to an orange photon of wavelength 620 nm? You may, if you wish, express your answer either in m/s or in terms of the speed of light c (e.g., "0.021c"). [You'll need to do a little bit of algebra. Keep in mind that, by convention, the velocity...
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?
5- Consider a binary system composed of a star 1 and a star 2 that both...
5- Consider a binary system composed of a star 1 and a star 2 that both have very eccentric orbits (el = e2 = 0.500). They both take 3.00 months to complete an orbit but the semi-major axis of star 2 is three times larger than that of star 1. The two stars are very close to each other since the sum of their semi-major axes is 0.500 AU. They both lie 50.0 ly from us. a) Make a somewhat...
a) An Sb galaxy has an absolute magnitude in the B band of -20.21. i) Estimate the isophotal radius at 25 B - mag arcsec...
a) An Sb galaxy has an absolute magnitude in the B band of -20.21. i) Estimate the isophotal radius at 25 B - mag arcsec−2 . ii) Estimate the rotational velocity of the galaxy. iii) Estimate the angular rotation speed of a star at the isphotal radius in arsec yr−1 .
5. A globular cluster has a total of 109 stars. 100 of them have a V-band magnitude of M,=0 and the rest have My = +5.0. What is the integrated absolute magntiude of the cluster? combined m m = -2,5109 (La) (a) ma-M=51098d) & is 4
Hi! So this table on the picture has star information needed.
the queastion is:
“A star whose apparent magnitude and absolute magnitude are
identical is licated at 10 persecs away from us (by definition).
Star C is at 10 pc. Of the other four stars, rank them from
closest, closer, farther, farthest. (HINT: figure out if a star
would be brighter or dimmer IF it were located at 10
persecs.)”
So on second picture were my answers, and i got...
1. If you look at the CMD of
NGC 6397 in the lower-right corner, what are the stars there? There
are no stars here fainter
than I = 25. Why do you think this is? What is it telling
us?
2.If you look at the CMD of NGC 6397 in the lower-left corner,
what are the stars there? There are no stars here fainter
than I = 28. Why do you think this is? What is it telling
us?
The...
6
1. A red photon has a wavelength of 660 nm. How fast must a star be moving toward the Earth for a red photon emitted by the star to change its color to an orange photon of wavelength 620 nm? You may, if you wish, express your answer either in m/s or in terms of the speed of light c (e.g., "0.021c"). [You'll need to do a little bit of algebra. Keep in mind that, by convention, the velocity...
5- Consider a binary system composed of a star 1 and a star 2 that both have very eccentric orbits (el = e2 = 0.500). They both take 3.00 months to complete an orbit but the semi-major axis of star 2 is three times larger than that of star 1. The two stars are very close to each other since the sum of their semi-major axes is 0.500 AU. They both lie 50.0 ly from us. a) Make a somewhat...
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