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
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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...
If a neutron star and a white dwarf has a total mass of 1M. If the white dwarf has a radius of 9 x 106 m and the neutron star has a radius of 11 km. i) Compare the surface gravity of both stars. ii) W...
If a neutron star and a white dwarf has a total mass of 1M. If the white dwarf has a radius of 9 x 106 m and the neutron star has a radius of 11 km. i) Compare the surface gravity of both stars. ii) What is the density of the neutron star? iii) Assuming the neutron star is entirely made up of neutrons, and that the interparticle separation of a gas of density n is l = n-1/3. How...
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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