Dispersive Extinction Theory of Redshift
... lines from the same star or galaxy. These lines do not have to belong to the same element. The shifts of the different lines should be the same if they are caused by the Doppler effect. If, however, the redshifts of the different lines from the same star or galaxy turn out to be different, then they ...
... lines from the same star or galaxy. These lines do not have to belong to the same element. The shifts of the different lines should be the same if they are caused by the Doppler effect. If, however, the redshifts of the different lines from the same star or galaxy turn out to be different, then they ...
low surface brightness galaxies
... α -elementσ are released mainly by supernovae type-II, while the main contribution to the Fe-peak elements comes from supernovae type-Ia. massive ellipticals have super-solar [/Fe] ratios, suggesting that they formed on relatively short time–scales and/or have an initial mass function that is skewed ...
... α -elementσ are released mainly by supernovae type-II, while the main contribution to the Fe-peak elements comes from supernovae type-Ia. massive ellipticals have super-solar [/Fe] ratios, suggesting that they formed on relatively short time–scales and/or have an initial mass function that is skewed ...
Major Stars of the Orion Constellation
... Mars and Jupiter. Due to its closeness and angular diameter, it was one of the first extra solar objects to have its disk diameter measured. “The angular diameter of Betelgeuse was first measured in 1920-1921 by Michelson and Pease using an astronomical interferometer on the Mount Wilson 100 inch te ...
... Mars and Jupiter. Due to its closeness and angular diameter, it was one of the first extra solar objects to have its disk diameter measured. “The angular diameter of Betelgeuse was first measured in 1920-1921 by Michelson and Pease using an astronomical interferometer on the Mount Wilson 100 inch te ...
Lecture17
... How can this be? They emit less light per square meter than a blue main sequence star, but, they are much, much bigger (more square meters)! ...
... How can this be? They emit less light per square meter than a blue main sequence star, but, they are much, much bigger (more square meters)! ...
Elliptical Galaxies
... After these simple types of galaxies the diagram splits into two. On the upper branch are the S0 galaxies first - called lenticular galaxies because they are shaped like a lens in a magnfiying glass. The description is made up of the "S", meaning lenticular, the "0", meaning no arms, and the subscr ...
... After these simple types of galaxies the diagram splits into two. On the upper branch are the S0 galaxies first - called lenticular galaxies because they are shaped like a lens in a magnfiying glass. The description is made up of the "S", meaning lenticular, the "0", meaning no arms, and the subscr ...
Spiralicity and Motion on Cosmic Scale
... gases and dark dust that made them to come together. The ultraviolet-light observations by the Hubble Space Telescope are unvealing a colourful picture of the universe providing information about the birth and formation of distant galaxies. Understanding the evolving universe at cosmic distance scal ...
... gases and dark dust that made them to come together. The ultraviolet-light observations by the Hubble Space Telescope are unvealing a colourful picture of the universe providing information about the birth and formation of distant galaxies. Understanding the evolving universe at cosmic distance scal ...
Document
... b. 2,500,000 light years 21. If the Milky Way were in Los Angeles, one hundred miles across, where would the Andromeda Galaxy be? c. New York 22. The Milky Way and Andromeda galaxies will eventually collide. a. True (2 choices) ...
... b. 2,500,000 light years 21. If the Milky Way were in Los Angeles, one hundred miles across, where would the Andromeda Galaxy be? c. New York 22. The Milky Way and Andromeda galaxies will eventually collide. a. True (2 choices) ...
1 How luminous are stars?
... Mass: from period (p) and average separation (a) of binary-star orbit ...
... Mass: from period (p) and average separation (a) of binary-star orbit ...
Eclipsing binary stars
... implied by the oscillatory motion of the observable star [4]. • Astrometric binaries: If only one component is visible and the other one is too faint or is too close to its brighter companion, we cannot observe both components of the double system with telescope. That this bright star has a companio ...
... implied by the oscillatory motion of the observable star [4]. • Astrometric binaries: If only one component is visible and the other one is too faint or is too close to its brighter companion, we cannot observe both components of the double system with telescope. That this bright star has a companio ...
Globular Clusters
... the same brightness and colour, they have probably been burning hydrogen for much the same length of time, indicating that these stars all formed about same time. Most of the remaining long-lived stars have a similar brightness and colour to our sun or smaller dwarf stars, and they are yet to evolve ...
... the same brightness and colour, they have probably been burning hydrogen for much the same length of time, indicating that these stars all formed about same time. Most of the remaining long-lived stars have a similar brightness and colour to our sun or smaller dwarf stars, and they are yet to evolve ...
It`s cosmic! - NSW Department of Education
... Each galaxy is a very large spinning structure. It contains billions of stars. It also contains clouds of gas and dust called nebulas. Some of the stars, like our Sun, have planets. All these things are held together in each galaxy by gravitational forces. (You feel a gravitational force on Earth. I ...
... Each galaxy is a very large spinning structure. It contains billions of stars. It also contains clouds of gas and dust called nebulas. Some of the stars, like our Sun, have planets. All these things are held together in each galaxy by gravitational forces. (You feel a gravitational force on Earth. I ...
Galaxy Questions Info
... (pinwheel-shaped) arms, a bulge at its center, and a halo. Spiral galaxies have a variety of shapes, and they are classified according to the size of the bulge and the tightness and appearance of the arms. The spiral arms, which wrap around the bulge, contain many young blue stars and lots of gas an ...
... (pinwheel-shaped) arms, a bulge at its center, and a halo. Spiral galaxies have a variety of shapes, and they are classified according to the size of the bulge and the tightness and appearance of the arms. The spiral arms, which wrap around the bulge, contain many young blue stars and lots of gas an ...
AST_s309_ss11_2 - University of Texas at Austin
... Eliminate Instrumental Shifts Recall that on a spectrograph we only measure a Doppler shift in Dx (pixels). This has to be converted into a wavelength to get the radial velocity shift. Instrumental shifts (shifts of the detector and/or optics) can introduce „Doppler shifts“ larger than the ones due ...
... Eliminate Instrumental Shifts Recall that on a spectrograph we only measure a Doppler shift in Dx (pixels). This has to be converted into a wavelength to get the radial velocity shift. Instrumental shifts (shifts of the detector and/or optics) can introduce „Doppler shifts“ larger than the ones due ...
normal and active - FirstLight Astro
... search for globsters in distant galaxies, then estimate distance ...
... search for globsters in distant galaxies, then estimate distance ...
Word
... Cepheid variables These very bright pulsing stars can be seen at great distances. The bigger thay are the brighter they shine and the slower they pulsate. ...
... Cepheid variables These very bright pulsing stars can be seen at great distances. The bigger thay are the brighter they shine and the slower they pulsate. ...
5 Great Facts of Life - Westside Church of Christ
... Big Dipper, for example, are members of a nearby star cluster roughly 75 light-years away. Their light takes a human lifetime to reach Earth. Nestled between the constellations Perseus and Cassiopeia lies a twin cluster of stars-the Double Cluster. Their light travels for 7,000 years before it reach ...
... Big Dipper, for example, are members of a nearby star cluster roughly 75 light-years away. Their light takes a human lifetime to reach Earth. Nestled between the constellations Perseus and Cassiopeia lies a twin cluster of stars-the Double Cluster. Their light travels for 7,000 years before it reach ...
Today`s Powerpoint
... - contains young and old stars, gas, dust. Has spiral structure - vertical thickness roughly 100 pc - 2 kpc (depending on component. Most gas and dust in thinner layer, most stars in thicker layer) ...
... - contains young and old stars, gas, dust. Has spiral structure - vertical thickness roughly 100 pc - 2 kpc (depending on component. Most gas and dust in thinner layer, most stars in thicker layer) ...
Stellar Luminosity and Mass Functions * * * * * History and
... There are no very luminous main sequence stars. But this does not mean that the IMF of the cluster had zero massive stars, only that such stars have ended their main sequence lifetimes. More generally, we need to allow for the differing lifetimes of different stars in deriving the IMF. If we assume ...
... There are no very luminous main sequence stars. But this does not mean that the IMF of the cluster had zero massive stars, only that such stars have ended their main sequence lifetimes. More generally, we need to allow for the differing lifetimes of different stars in deriving the IMF. If we assume ...
Galactic Center problem sheet
... the Massive Black Hole in the Galactic Center. ApJ, 692:1075–1109. Meyer, L., Ghez, A. M., Sch¨ odel, R., Yelda, S., Boehle, A., Lu, J. R., Do, T., Morris, M. R., Becklin, E. E., and Matthews, K. (2012). The Shortest-Known-Period Star Orbiting Our Galaxy’s Supermassive Black Hole. Science, 338:84–. ...
... the Massive Black Hole in the Galactic Center. ApJ, 692:1075–1109. Meyer, L., Ghez, A. M., Sch¨ odel, R., Yelda, S., Boehle, A., Lu, J. R., Do, T., Morris, M. R., Becklin, E. E., and Matthews, K. (2012). The Shortest-Known-Period Star Orbiting Our Galaxy’s Supermassive Black Hole. Science, 338:84–. ...
Stars, Galaxies, and the Universe Section 1
... much light the star emits and how far the star is from Earth. • Absolute magnitude the brightness that a star would have at a distance of 32.6 light-years from Earth • The brighter a star is, the lower the number of its ...
... much light the star emits and how far the star is from Earth. • Absolute magnitude the brightness that a star would have at a distance of 32.6 light-years from Earth • The brighter a star is, the lower the number of its ...
Chapter 15
... 5. What fundamental principle did Shapley use to calibrate the period-luminosity relationship for Cepheid variable stars? a. Light intensity falls off with the inverse square of distance. b. Stars that appear brighter are on average closer to Earth. c. Large pulsating objects have longer periods tha ...
... 5. What fundamental principle did Shapley use to calibrate the period-luminosity relationship for Cepheid variable stars? a. Light intensity falls off with the inverse square of distance. b. Stars that appear brighter are on average closer to Earth. c. Large pulsating objects have longer periods tha ...
stars
... Be stars are non-supergiant B-type stars whose spectra have, or had at some time, one or more Balmer lines in emission. The mystery of the "Be phenomenon" is that the emission, which is well understood to originate from a flattened circumstellar disk (e.g. Struve, 1931), can come and go episodically ...
... Be stars are non-supergiant B-type stars whose spectra have, or had at some time, one or more Balmer lines in emission. The mystery of the "Be phenomenon" is that the emission, which is well understood to originate from a flattened circumstellar disk (e.g. Struve, 1931), can come and go episodically ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.