Document
... The Large Magellanic Cloud The Large Magellanic Cloud is the 3rd closest galaxy to the Milky Way after the Sagittarius and Canis Major galaxies. It is 160,000 light years away from us, corresponding to 10,000,000,000 times the distance between the earth and the sun. If we are in the southern hemisp ...
... The Large Magellanic Cloud The Large Magellanic Cloud is the 3rd closest galaxy to the Milky Way after the Sagittarius and Canis Major galaxies. It is 160,000 light years away from us, corresponding to 10,000,000,000 times the distance between the earth and the sun. If we are in the southern hemisp ...
File - Mr. Catt`s Class
... remain in equilibrium. The changes occurring in its core are often periodic. 2. Two types of pulsating stars are especially important to astronomers because they can be used as distance indicators: – the Cepheid variables (with periods between 1 and 100 days) ...
... remain in equilibrium. The changes occurring in its core are often periodic. 2. Two types of pulsating stars are especially important to astronomers because they can be used as distance indicators: – the Cepheid variables (with periods between 1 and 100 days) ...
Dancing with Stars 3 Dancing with Stars Binary Stellar Evolution 1
... the loss of even more mass, resulting in an even smaller Roche lobe. A positive feedback operates in the sense that the more mass the star loses, the more it is forced to lose. The more massive star only approaches the condition of mass loss on the relatively slow time dictated by the contracting o ...
... the loss of even more mass, resulting in an even smaller Roche lobe. A positive feedback operates in the sense that the more mass the star loses, the more it is forced to lose. The more massive star only approaches the condition of mass loss on the relatively slow time dictated by the contracting o ...
lecture19 - Stony Brook University
... neutron core. The supernova lights up the sky and seeds the neighborhood with heavy elements used for complex life. What’s left of the star after the explosion? If the mass of the sphere of neutrons is less than about 3 solar masses, it remains as a ...
... neutron core. The supernova lights up the sky and seeds the neighborhood with heavy elements used for complex life. What’s left of the star after the explosion? If the mass of the sphere of neutrons is less than about 3 solar masses, it remains as a ...
Sky Diary - Society for Popular Astronomy
... of October. The apparent proximity of both Saturn and Jupiter to the Sun means that they too are lost to detailed night time observation but, Saturn in particular, may be found and observed in daylight as long as sensible precautions are taken to ensure the Sun can never enter the field of view of e ...
... of October. The apparent proximity of both Saturn and Jupiter to the Sun means that they too are lost to detailed night time observation but, Saturn in particular, may be found and observed in daylight as long as sensible precautions are taken to ensure the Sun can never enter the field of view of e ...
Star Search Game: Constructing a Hertzsprung
... Inspired by: Ian Christie (VSSEC); Activity created by: Nandita Bajaj Introduction: Star Search is an online game developed by the Victorian Space Science Education Centre (VSSEC) that allows the user to go on a simulated journey into space using a spacecraft in search of various stars. The user is ...
... Inspired by: Ian Christie (VSSEC); Activity created by: Nandita Bajaj Introduction: Star Search is an online game developed by the Victorian Space Science Education Centre (VSSEC) that allows the user to go on a simulated journey into space using a spacecraft in search of various stars. The user is ...
Document
... Compact 650 millionHCG87 light year across Centaurus A 170,000 light year across Irregular galaxy ...
... Compact 650 millionHCG87 light year across Centaurus A 170,000 light year across Irregular galaxy ...
Lecture102802 - FSU High Energy Physics
... Hydrogen continues to burn in shell surrounding core Star grows more luminous (why?) ...
... Hydrogen continues to burn in shell surrounding core Star grows more luminous (why?) ...
The Southern Winter PDF
... spiral galaxies throughout the Universe. However, the view towards the center of our galaxy (middle, marked) and its lurking supermassive black hole is obscured at visible wavelengths and difficult to interpret. Most of the light in this spectacular scene, 34 by 20 degrees across, comes from the myr ...
... spiral galaxies throughout the Universe. However, the view towards the center of our galaxy (middle, marked) and its lurking supermassive black hole is obscured at visible wavelengths and difficult to interpret. Most of the light in this spectacular scene, 34 by 20 degrees across, comes from the myr ...
AAVSO: Mu Cephei, October 2002 Variable Star Of The Month
... extended period of time; accordingly, red stars would appear to become unduly bright in comparison to blue stars, thus producing an erroneous impression of the relative magnitudes. Another technique that is strongly recommended for making magnitude estimates of red stars, is called the “out-of-focus ...
... extended period of time; accordingly, red stars would appear to become unduly bright in comparison to blue stars, thus producing an erroneous impression of the relative magnitudes. Another technique that is strongly recommended for making magnitude estimates of red stars, is called the “out-of-focus ...
The Milky Way - National Tsing Hua University
... probably related to the deaths of very massive (> 25 Msun) stars. In a supernova-like explosion of stars this massive, the core might collapse not to a neutron star, but directly to a black hole. Such stellar explosions are ...
... probably related to the deaths of very massive (> 25 Msun) stars. In a supernova-like explosion of stars this massive, the core might collapse not to a neutron star, but directly to a black hole. Such stellar explosions are ...
Star Life Cycle Web Activity
... equilibrium and then losing it after burning out one fuel source…then condensing (shrinking) because of gravity, making the core more dense and hotter…so hot that now a new element can be used as fuel to burn and equilibrium is reached once again. Eventually the fuel sources run out and the star die ...
... equilibrium and then losing it after burning out one fuel source…then condensing (shrinking) because of gravity, making the core more dense and hotter…so hot that now a new element can be used as fuel to burn and equilibrium is reached once again. Eventually the fuel sources run out and the star die ...
Pinpointing the Milky Way
... Gaia’s processing is broken down into components to facilitate distributed development, identifying the major parts of the system that may operate relatively independently. This approach is also driven by the fact that the system is to be developed in many countries by a number of teams, each with d ...
... Gaia’s processing is broken down into components to facilitate distributed development, identifying the major parts of the system that may operate relatively independently. This approach is also driven by the fact that the system is to be developed in many countries by a number of teams, each with d ...
star-formation rate
... explosions and stellar winds. The fraction α = (1− R) of a newly-formed stellar population remains enclosed in stars, i.e., it no longer takes part in the further chemical evolution of the ISM. The value of α depends on the IMF of the stellar population and can be computed from models of population ...
... explosions and stellar winds. The fraction α = (1− R) of a newly-formed stellar population remains enclosed in stars, i.e., it no longer takes part in the further chemical evolution of the ISM. The value of α depends on the IMF of the stellar population and can be computed from models of population ...
TAURUS ZODIAC CONSTELLATION In Greek mythology, Taurus
... In illustrations, only the front portion of this constellation are depicted; in Greek mythology this was sometimes explained as Taurus being partly submerged as he carried Europa out to sea. Greek mythographer Acusilaus marks the bull Taurus as the same that formed the myth of the Cretan Bull, one o ...
... In illustrations, only the front portion of this constellation are depicted; in Greek mythology this was sometimes explained as Taurus being partly submerged as he carried Europa out to sea. Greek mythographer Acusilaus marks the bull Taurus as the same that formed the myth of the Cretan Bull, one o ...
Astronomy Assignment #1
... Alpha Centauri A has an angular diameter of 0.0085 arcsec, while Alpha Centauri B has an angular diameter of 0.0060 arcsec. The pairs are at a distance of 4.4 lyr. What are their diameters compared to the Sun. This is a fairly messy problem. There is one short cut we can use. After we calculate the ...
... Alpha Centauri A has an angular diameter of 0.0085 arcsec, while Alpha Centauri B has an angular diameter of 0.0060 arcsec. The pairs are at a distance of 4.4 lyr. What are their diameters compared to the Sun. This is a fairly messy problem. There is one short cut we can use. After we calculate the ...
Supernovae Gamma-Ray Bursts and and some of their uses
... If you can measure T (distance-independent), understand the deviations from the perfect blackbody, and could determine R, then from the observed flux F and the inferred luminosity L you can get the distance D Fudge factor to account for the deviations from blackbody, from spectra models ...
... If you can measure T (distance-independent), understand the deviations from the perfect blackbody, and could determine R, then from the observed flux F and the inferred luminosity L you can get the distance D Fudge factor to account for the deviations from blackbody, from spectra models ...
Notes for Class 5, February 16
... Built great observatories on his island Fights, duels, possibly died from being drunk, but also careful astronomical measurements • Convinced astronomy needed good measurements ...
... Built great observatories on his island Fights, duels, possibly died from being drunk, but also careful astronomical measurements • Convinced astronomy needed good measurements ...
Chemical abundances and winds of massive stars in M31: a B
... reduced in the standard manner, using the same methods as described in McCarthy et al. (1997). The most difficult task was removing the strong background Hα nebular emission from the stellar spectrum. In fact complete removal proved impossible, and we have left in the residual (negative) nebular Hα ...
... reduced in the standard manner, using the same methods as described in McCarthy et al. (1997). The most difficult task was removing the strong background Hα nebular emission from the stellar spectrum. In fact complete removal proved impossible, and we have left in the residual (negative) nebular Hα ...
E3 – Stellar distances
... • Only useful for close stars (up to 300 ly (100 pc) as further than that the parallax angle is too small (space based telescopes can use this method to measure stars up to distances of 500 pc). ...
... • Only useful for close stars (up to 300 ly (100 pc) as further than that the parallax angle is too small (space based telescopes can use this method to measure stars up to distances of 500 pc). ...
What is a Star - Optics Institute of Southern California
... Main sequence stars have zones (in radius) which are convective, and zones which are radiative, and the location of these zones depends on the behavior of the opacity, in addition to the other properties of the star. Massive stars (i.e., greater than several solar masses) are convective deep in the ...
... Main sequence stars have zones (in radius) which are convective, and zones which are radiative, and the location of these zones depends on the behavior of the opacity, in addition to the other properties of the star. Massive stars (i.e., greater than several solar masses) are convective deep in the ...
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.