Tuesday, October 28th "The Formation and Evolution of Galaxies"
... Sun. For instance, if the Sun had a rapidly rotating core left over from early stages of star formation, and if that core were tilted with respect to its outer layers, the result would be surface bulging. "RHESSI's precision measurements place severe constraints on any such models." ...
... Sun. For instance, if the Sun had a rapidly rotating core left over from early stages of star formation, and if that core were tilted with respect to its outer layers, the result would be surface bulging. "RHESSI's precision measurements place severe constraints on any such models." ...
Astronomy 20 Homework # 2
... Handed out on October 8, 2004 Due in class on Friday, October 15, 2004 1. What are the apparent bolometric magnitudes of: (a) a Sun-like star 50 pc away? (b) a 100 Watt lightbulb 10 km away? (c) a galaxy containing ∼ 3 × 1010 stars of an average luminosity ∼ 0.5L⊙ 20 Mpc away? (d) A quasar with lumi ...
... Handed out on October 8, 2004 Due in class on Friday, October 15, 2004 1. What are the apparent bolometric magnitudes of: (a) a Sun-like star 50 pc away? (b) a 100 Watt lightbulb 10 km away? (c) a galaxy containing ∼ 3 × 1010 stars of an average luminosity ∼ 0.5L⊙ 20 Mpc away? (d) A quasar with lumi ...
Dark Sky Scotland - Constellation Project
... Centauri and even this close neighbour is about four Light Years away! In 1838, Thomas Henderson, Astronomy Royal for Scotland, was one of three scientists who, independently, first measured the distances to nearby stars. This helped to provide a dramatically new appreciation of the scale of the Uni ...
... Centauri and even this close neighbour is about four Light Years away! In 1838, Thomas Henderson, Astronomy Royal for Scotland, was one of three scientists who, independently, first measured the distances to nearby stars. This helped to provide a dramatically new appreciation of the scale of the Uni ...
Earth and Space Review 2016
... Direction of revolution Seasons in both the Northern and Southern Hemispheres for each location of Earth in orbit Summer and Winter Solstices Spring and Fall Equinoxes Direct and indirect light from the Sun ...
... Direction of revolution Seasons in both the Northern and Southern Hemispheres for each location of Earth in orbit Summer and Winter Solstices Spring and Fall Equinoxes Direct and indirect light from the Sun ...
Bright stars and faint stars: the stellar magnitude system Magnitudes
... Absolute Magnitude: a measure of the intrinsic brilliance of a star • Pick a star (any star) • Imagine moving it to a distance of 10 parsecs • The apparent magnitude it would have is its absolute magnitude • The absolute magnitude is a distanceindependent quantity • Look at Appendix 12 and Appendix ...
... Absolute Magnitude: a measure of the intrinsic brilliance of a star • Pick a star (any star) • Imagine moving it to a distance of 10 parsecs • The apparent magnitude it would have is its absolute magnitude • The absolute magnitude is a distanceindependent quantity • Look at Appendix 12 and Appendix ...
10 September: Faint Stars and Bright Stars
... Absolute Magnitude: a measure of the intrinsic brilliance of a star • Pick a star (any star) • Imagine moving it to a distance of 10 parsecs • The apparent magnitude it would have is its absolute magnitude • The absolute magnitude is a distanceindependent quantity • Look at Appendix 12 and Appendix ...
... Absolute Magnitude: a measure of the intrinsic brilliance of a star • Pick a star (any star) • Imagine moving it to a distance of 10 parsecs • The apparent magnitude it would have is its absolute magnitude • The absolute magnitude is a distanceindependent quantity • Look at Appendix 12 and Appendix ...
AMUSE-Virgo Super-massive black holes vs. nuclear star clusters: the X-ray view
... Dealing with `Eddington-limited’ sub-samples results in Gallo+ no evidence 2009, in prep. ...
... Dealing with `Eddington-limited’ sub-samples results in Gallo+ no evidence 2009, in prep. ...
Temperatures of Stars
... with respect to hydrogen in astronomical jargon this parameter is called [Fe/H] for the Sun, [Fe/H] = 0. For a star with an abundance of iron and other heavy elements ten times smaller than in the Sun, [Fe/H] = -1 ...
... with respect to hydrogen in astronomical jargon this parameter is called [Fe/H] for the Sun, [Fe/H] = 0. For a star with an abundance of iron and other heavy elements ten times smaller than in the Sun, [Fe/H] = -1 ...
Milky Way
... GRBs: Fantastic explosions! • In 1991 new telescopes showed GRBs are isotropic on the sky, proving they are (usually) NOT from our galaxy • Afterglows (optical) were seen from some GRBs. This allowed the host galaxies to be identified and distances to be measured. • The luminosities of these things ...
... GRBs: Fantastic explosions! • In 1991 new telescopes showed GRBs are isotropic on the sky, proving they are (usually) NOT from our galaxy • Afterglows (optical) were seen from some GRBs. This allowed the host galaxies to be identified and distances to be measured. • The luminosities of these things ...
celestial equator
... The brightest stars were called stars of the first magnitude. Fainter stars were classified as being of second, third, fourth, or fifth magnitude. Now stars can be measured to +/- 0.01 magnitude. We have also expanded the scale to include negative values, and much larger positive values. Sirius, fo ...
... The brightest stars were called stars of the first magnitude. Fainter stars were classified as being of second, third, fourth, or fifth magnitude. Now stars can be measured to +/- 0.01 magnitude. We have also expanded the scale to include negative values, and much larger positive values. Sirius, fo ...
titel - Maastricht University
... An example of an unstable – but notperiodic – star is this massive ‘WolfRayet star’ NGC2359, that irregularly ejects large parts of its own outer envelope in gargantuan explosions. The star itself is in the central bubble, the clouds are remnants of previous ...
... An example of an unstable – but notperiodic – star is this massive ‘WolfRayet star’ NGC2359, that irregularly ejects large parts of its own outer envelope in gargantuan explosions. The star itself is in the central bubble, the clouds are remnants of previous ...
Mathematical Reasoning
... Ratios and Proportions: To solve comparative problems for two related objects or conditions Suppose two stars are identical, but star B is 4 times farther away than star A. What is the brightness ratio between star A and star B? Brightness A α 1 / (distance A)2 Brightness B α 1 / (distance B)2 Brigh ...
... Ratios and Proportions: To solve comparative problems for two related objects or conditions Suppose two stars are identical, but star B is 4 times farther away than star A. What is the brightness ratio between star A and star B? Brightness A α 1 / (distance A)2 Brightness B α 1 / (distance B)2 Brigh ...
SAP_Paper1_FutureOfUniverse
... to decelerate each body’s rotation. This can happen from a conservation of energy standpoint because the rotation energy is transferred into potential energy as the bodies are pushed into a more distant orbit. The most studied system of this type is the Earth-Moon system and the effects are very vis ...
... to decelerate each body’s rotation. This can happen from a conservation of energy standpoint because the rotation energy is transferred into potential energy as the bodies are pushed into a more distant orbit. The most studied system of this type is the Earth-Moon system and the effects are very vis ...
Structure of the Universe
... massive stars, but rather a white dwarf that accretes mass from a companion until it exceeds the Chandrasekhar limit (1.4 Msun) ...
... massive stars, but rather a white dwarf that accretes mass from a companion until it exceeds the Chandrasekhar limit (1.4 Msun) ...
Astronomy II (ASTR-1020) — Homework 1
... 10. If an object is at 0 K in temperature, which of the following is true? a) It emits most of its light at visual wavelengths. b) It emits most of its light at X-ray wavelengths. c) The atoms that compose the object are not moving. d) The atoms that compose the object are ionized. e) None of the a ...
... 10. If an object is at 0 K in temperature, which of the following is true? a) It emits most of its light at visual wavelengths. b) It emits most of its light at X-ray wavelengths. c) The atoms that compose the object are not moving. d) The atoms that compose the object are ionized. e) None of the a ...
Extreme Tidal Waves in Binary Star Systems
... burned down to become much smaller and more massive. The larger star stars. One of the effects is about the size of Neptune and about a quarter of the mass of the sun. of tides is to synchronize The other one is half the sun’s mass and only about the size of the earth. the spin and orbital A penny m ...
... burned down to become much smaller and more massive. The larger star stars. One of the effects is about the size of Neptune and about a quarter of the mass of the sun. of tides is to synchronize The other one is half the sun’s mass and only about the size of the earth. the spin and orbital A penny m ...
The Stars and the Solar System
... The farther a planet is from the Sun, the longer it takes to orbit. The time it takes to complete one trip around the Sun is called a YEAR. Earth’s year is about 365 days long. Mercury makes a complete orbit in just 88 days. Neptune takes about 165 Earth years to complete its orbit around the Sun. ...
... The farther a planet is from the Sun, the longer it takes to orbit. The time it takes to complete one trip around the Sun is called a YEAR. Earth’s year is about 365 days long. Mercury makes a complete orbit in just 88 days. Neptune takes about 165 Earth years to complete its orbit around the Sun. ...
inaugural091112
... • Process is rapid: clouds consumed within few hundred million years • Yet we detect plenty of clouds: clouds exist • Some Unknown Unknown (UU) holds up the clouds ...
... • Process is rapid: clouds consumed within few hundred million years • Yet we detect plenty of clouds: clouds exist • Some Unknown Unknown (UU) holds up the clouds ...
arXiv:0712.2297v1 [astro
... The HET observations and data analysis for this survey have been described by Niedzielski et al. (2007). Briefly, we observe with the HET in its queue-scheduling mode and use the HRS at the R=60,000 resolution with the gas cell (I2 ) inserted in the optical path. In our target selection, we avoid br ...
... The HET observations and data analysis for this survey have been described by Niedzielski et al. (2007). Briefly, we observe with the HET in its queue-scheduling mode and use the HRS at the R=60,000 resolution with the gas cell (I2 ) inserted in the optical path. In our target selection, we avoid br ...
R136a1
RMC 136a1 (usually abbreviated to R136a1) is a Wolf-Rayet star located at the center of R136, the central condensation of stars of the large NGC 2070 open cluster in the Tarantula Nebula. It lies at a distance of about 50 kiloparsecs (163,000 light-years) in the Large Magellanic Cloud. It has the highest mass and luminosity of any known star, at 265 M☉ and 8.7 million L☉, and also one of the hottest at over 50,000 K.