Ch 19 Directed Reading
... 17. A huge explosion in which a large star dies is called a _____________________________. 18. A star made up of neutrons is called a _____________________________. 19. A spinning neutron star that emits pulses of energy is called a _____________________________. 20. An object so massive and dense t ...
... 17. A huge explosion in which a large star dies is called a _____________________________. 18. A star made up of neutrons is called a _____________________________. 19. A spinning neutron star that emits pulses of energy is called a _____________________________. 20. An object so massive and dense t ...
Renaissance Astronomy
... The accuracy of Tycho's best positional measurements was +/- 1 arc minute. This was an improvement of a factor of 10 over previous observations. If the stars were closer than 3438 Astronomical Units, Tycho should have been able to measure their trigonometric parallaxes. But he found no parallax for ...
... The accuracy of Tycho's best positional measurements was +/- 1 arc minute. This was an improvement of a factor of 10 over previous observations. If the stars were closer than 3438 Astronomical Units, Tycho should have been able to measure their trigonometric parallaxes. But he found no parallax for ...
W > 1 - The Open University
... Test your eyesight from a dark site by counting the number of naked eye stars that are visible. Seven should readily be seen. Keen vision will lead you into double figures. A test for moderate apertures is the nebulosity around some of the other brighter stars of the group, especially Merope. Nebula ...
... Test your eyesight from a dark site by counting the number of naked eye stars that are visible. Seven should readily be seen. Keen vision will lead you into double figures. A test for moderate apertures is the nebulosity around some of the other brighter stars of the group, especially Merope. Nebula ...
Stellar Evolution
... the same age, but different masses, appear as the cluster as a whole ages. After 107 years, some of the most massive stars have already left the main sequence, while many of the least massive have not even reached it yet. Note that the lowest mass bodies are still proto-stars. ...
... the same age, but different masses, appear as the cluster as a whole ages. After 107 years, some of the most massive stars have already left the main sequence, while many of the least massive have not even reached it yet. Note that the lowest mass bodies are still proto-stars. ...
Pattern recognition of star constellations for spacecraft
... on the most accurate reference, i.e., the stars. The principle in attitude determination by the stars is as follows: some image forming device (e.g., a CCD-camera) is directed towards the stars. If the image can be matched to a reference, the direction of the imaging device is known, and thus the at ...
... on the most accurate reference, i.e., the stars. The principle in attitude determination by the stars is as follows: some image forming device (e.g., a CCD-camera) is directed towards the stars. If the image can be matched to a reference, the direction of the imaging device is known, and thus the at ...
Earth Rotation and Revolution Powerpoint
... • This deflection occurs because Earth’s surface is rotating with respect to the objects. ...
... • This deflection occurs because Earth’s surface is rotating with respect to the objects. ...
across
... Back in the 1850s, scientists thought the Sun's energy came from gravity- the Sun was converting gravitational energy to heat. Egrav=GMm/R. So as R get smaller, energy can be released. Lord Kelvin estimated the Sun could last 30 million years based on this. ...
... Back in the 1850s, scientists thought the Sun's energy came from gravity- the Sun was converting gravitational energy to heat. Egrav=GMm/R. So as R get smaller, energy can be released. Lord Kelvin estimated the Sun could last 30 million years based on this. ...
V - ESO
... Galactic Centre clusters Quintuplet, Arches. Massive and compact clusters. Galactic Centre “cluster” The Arches has many massive stars, some with M> 100 M. (e.g., Figer et al. 2002, ApJ 581, 258) The Arches has a top-heavy IMF (Stolte et al. 2002, A&A 394, 459). ...
... Galactic Centre clusters Quintuplet, Arches. Massive and compact clusters. Galactic Centre “cluster” The Arches has many massive stars, some with M> 100 M. (e.g., Figer et al. 2002, ApJ 581, 258) The Arches has a top-heavy IMF (Stolte et al. 2002, A&A 394, 459). ...
Stars, Galaxies & Universe
... Egyptians: polished rock crystal to produce optical illusions Mozi, a Chinese philosopher- 470 bc- writes on concave mirrors to focus’ sun’s rays Galileo—1609used the first telescope for astronomy purposes, made improvements -Italian Brahe-1572-used an observatory to make observations -Danish Kepler ...
... Egyptians: polished rock crystal to produce optical illusions Mozi, a Chinese philosopher- 470 bc- writes on concave mirrors to focus’ sun’s rays Galileo—1609used the first telescope for astronomy purposes, made improvements -Italian Brahe-1572-used an observatory to make observations -Danish Kepler ...
Theme 5: The Rise of the Telescope:
... nitions of the stadion, and authorities disagree about which one Eratosthenes used; if instead we scale to his value of 252000 stadia for the Earth’s circumference, we get about 100 Earth radii for the former value (much too small) and about 20000 for the latter (within 20%). It is tempting to cred ...
... nitions of the stadion, and authorities disagree about which one Eratosthenes used; if instead we scale to his value of 252000 stadia for the Earth’s circumference, we get about 100 Earth radii for the former value (much too small) and about 20000 for the latter (within 20%). It is tempting to cred ...
Sections F and G
... objects are hotter than those around larger, less dense objects. Accretion discs around white dwarfs lead to optical emission (novae), while those around neutron stars (or black holes) result in X-ray emission (X-ray binaries). Novae A nova (short for stella nova, or new star) is a star which underg ...
... objects are hotter than those around larger, less dense objects. Accretion discs around white dwarfs lead to optical emission (novae), while those around neutron stars (or black holes) result in X-ray emission (X-ray binaries). Novae A nova (short for stella nova, or new star) is a star which underg ...
ppt document
... mass becomes neutrons that stick together by gravity. This is called a neutron star. It’s diameter is only about 20 kilometers (compared to about 12,000 kilometers for a white dwarf!). ...
... mass becomes neutrons that stick together by gravity. This is called a neutron star. It’s diameter is only about 20 kilometers (compared to about 12,000 kilometers for a white dwarf!). ...
Some space objects are visible to the human eye.
... above you, and still others set at the western horizon. Throughout the ages, many peoples have observed these changes and used them to help in navigation and measuring time. If you extended the North Pole into space, it would point almost exactly to a star called Polaris, or the North Star. If you w ...
... above you, and still others set at the western horizon. Throughout the ages, many peoples have observed these changes and used them to help in navigation and measuring time. If you extended the North Pole into space, it would point almost exactly to a star called Polaris, or the North Star. If you w ...
Define the following terms in the space provided
... F) At what altitude would Polaris appear above the northern horizon? Polaris would appear above the northern horizon at 32° altitude. G) Would a star with a declination of +60 be circumpolar? Explain. A star with a declination of +60 be circumpolar. It would dip to 2° above the northern horizon. H ...
... F) At what altitude would Polaris appear above the northern horizon? Polaris would appear above the northern horizon at 32° altitude. G) Would a star with a declination of +60 be circumpolar? Explain. A star with a declination of +60 be circumpolar. It would dip to 2° above the northern horizon. H ...
Lecture 1
... How big is our Milky Way? How does it compare to other galaxies? How far away are galaxies? Time scale: How much time do we live? how much time do stars live? how old is the universe? ...
... How big is our Milky Way? How does it compare to other galaxies? How far away are galaxies? Time scale: How much time do we live? how much time do stars live? how old is the universe? ...
Stars III The Hertzsprung
... in a stellar atmosphere become more and more excited due to more frequent collisions, so the lines in the star’s absorption spectrum change Eventually, if the temperature is high enough, some atoms are ionized and their lines disappear By knowing the energies of excitation and ionization of the vari ...
... in a stellar atmosphere become more and more excited due to more frequent collisions, so the lines in the star’s absorption spectrum change Eventually, if the temperature is high enough, some atoms are ionized and their lines disappear By knowing the energies of excitation and ionization of the vari ...
Final review - Physics and Astronomy
... In 1920's, Hubble used Cepheids to find distances to galaxies. Showed that redshift or recessional velocity is proportional to distance: ...
... In 1920's, Hubble used Cepheids to find distances to galaxies. Showed that redshift or recessional velocity is proportional to distance: ...
CONSTELLATION TUCANA, THE TOUCAN
... from binary star mergers. 47 Tucanae has an apparent magnitude of 3.9, meaning that it is visible to the naked eye; it is a Shapley class III cluster, which means that it has a clearly defined nucleus. Near to 47 Tucana on the sky, and often seen in wide-field photographs showing it, are two much mo ...
... from binary star mergers. 47 Tucanae has an apparent magnitude of 3.9, meaning that it is visible to the naked eye; it is a Shapley class III cluster, which means that it has a clearly defined nucleus. Near to 47 Tucana on the sky, and often seen in wide-field photographs showing it, are two much mo ...
Sample Midterm - IUPUI Physics
... 14. Why would using a cluster of stars in which all the stars are the same distance to plot on an HR diagram be very useful? a) The stars would then all be the same brightness b) The stars would then all be the same color c) Stars with different apparent magnitudes have different absolute magnitudes ...
... 14. Why would using a cluster of stars in which all the stars are the same distance to plot on an HR diagram be very useful? a) The stars would then all be the same brightness b) The stars would then all be the same color c) Stars with different apparent magnitudes have different absolute magnitudes ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.