Previously on Astro-1
... But sometimes it is convenient to use other units. The average distance from the Earth to the Sun is called an astronomical unit. 1 AU = 1.496×108 km The distance light travels in a year is a lightyear (ly). The nearest star, Proxima Centauri is 4.2 lyr away, so the light we see today left it 4.2 ye ...
... But sometimes it is convenient to use other units. The average distance from the Earth to the Sun is called an astronomical unit. 1 AU = 1.496×108 km The distance light travels in a year is a lightyear (ly). The nearest star, Proxima Centauri is 4.2 lyr away, so the light we see today left it 4.2 ye ...
NOVAE and SUPERNOVAE
... Occur only in stars whose masses are greater than 8 M. At the end of its life, massive stars form an iron core by fusing silicon. The iron core forms in a few days. Fusion ends at this point. The core has a mass of about 2 M. The iron core cannot support itself and collapses, from a size of ...
... Occur only in stars whose masses are greater than 8 M. At the end of its life, massive stars form an iron core by fusing silicon. The iron core forms in a few days. Fusion ends at this point. The core has a mass of about 2 M. The iron core cannot support itself and collapses, from a size of ...
Astronomy 1 – Winter 2011
... But sometimes it is convenient to use other units. The average distance from the Earth to the Sun is called an astronomical unit. 1 AU = 1.496×108 km The distance light travels in a year is a lightyear (ly). The nearest star, Proxima Centauri is 4.2 lyr away, so the light we see today left it 4.2 ye ...
... But sometimes it is convenient to use other units. The average distance from the Earth to the Sun is called an astronomical unit. 1 AU = 1.496×108 km The distance light travels in a year is a lightyear (ly). The nearest star, Proxima Centauri is 4.2 lyr away, so the light we see today left it 4.2 ye ...
Scientists classify stars by
... The gravity of a passing star or the shock wave from a nearby supernova may cause the nebula to contract. 1. Matter in the gas cloud will begin to come together into a dense region called a protostar. 2. As the protostar continues to condense, it heats up. 3. Eventually, it reaches a critical mass a ...
... The gravity of a passing star or the shock wave from a nearby supernova may cause the nebula to contract. 1. Matter in the gas cloud will begin to come together into a dense region called a protostar. 2. As the protostar continues to condense, it heats up. 3. Eventually, it reaches a critical mass a ...
section 17 powerpoint
... magnitude of V = 0.91, given that B1 III-IV stars typically have an absolute magnitude of MV = –3.7 ? ...
... magnitude of V = 0.91, given that B1 III-IV stars typically have an absolute magnitude of MV = –3.7 ? ...
Mass Segregation in Globular Clusters
... Globular clusters are spherical swarms of stars, typically comprising a million members, and extending a hundred lightyears across. Most galaxies, including our Milky Way, possess a halo of hundreds of globular clusters. (For scale, the Milky Way is about 100,000 light-years in diameter, and the dis ...
... Globular clusters are spherical swarms of stars, typically comprising a million members, and extending a hundred lightyears across. Most galaxies, including our Milky Way, possess a halo of hundreds of globular clusters. (For scale, the Milky Way is about 100,000 light-years in diameter, and the dis ...
Galaxies
... • There are 200 billion stars in the Milky Way. • Stars, gas, and dust are considered visible matter. • We can also estimate the mass in black holes. • The visible mass does not explain the orbits of stars in the galaxy. • The apparent mass is much larger (10 times). ...
... • There are 200 billion stars in the Milky Way. • Stars, gas, and dust are considered visible matter. • We can also estimate the mass in black holes. • The visible mass does not explain the orbits of stars in the galaxy. • The apparent mass is much larger (10 times). ...
Constituents of the Milky Way
... Because we are within the Galaxy, it is difficult to map out its structure. This is especially true when looking in the Galactic plane, because of all the dust. We are not near the center of the Galaxy, but where is the center? How far away is it? ...
... Because we are within the Galaxy, it is difficult to map out its structure. This is especially true when looking in the Galactic plane, because of all the dust. We are not near the center of the Galaxy, but where is the center? How far away is it? ...
Nuclear Fusion – when two H atoms combine to form one atom thus
... Nebula – Stars are formed or “born” in a nebula. Massive cosmic cloud of matter from which stars are created. Light Year – distance light travels in one year. 186,000 miles/sec – speed of light Life Cycle of a Star Stars start off as a nebula until a nuclear explosion causes the star to shine. The n ...
... Nebula – Stars are formed or “born” in a nebula. Massive cosmic cloud of matter from which stars are created. Light Year – distance light travels in one year. 186,000 miles/sec – speed of light Life Cycle of a Star Stars start off as a nebula until a nuclear explosion causes the star to shine. The n ...
Galaxy clusters - University of Iowa Astrophysics
... • From this, the amount of X-ray emitting gas can be calculated to be 2×1014 M • The mass of X-ray emitting gas is greater than the mass in all the stars in all the galaxies in the cluster and about 10% of the total mass. ...
... • From this, the amount of X-ray emitting gas can be calculated to be 2×1014 M • The mass of X-ray emitting gas is greater than the mass in all the stars in all the galaxies in the cluster and about 10% of the total mass. ...
Last Year`s Exam, Section B
... iron fusion does not generate energy when iron core gets too big, it will collapse, and cannot be saved by fusion iron core collapses to neutron star (or, for star as massive as θ1 Orionis C, perhaps black hole) infalling outer regions bounce off rigid neutron star ...
... iron fusion does not generate energy when iron core gets too big, it will collapse, and cannot be saved by fusion iron core collapses to neutron star (or, for star as massive as θ1 Orionis C, perhaps black hole) infalling outer regions bounce off rigid neutron star ...
sun_parallax2
... Hipparcos is a Earth orbiting satellite which is able to make extremely accurate measurements of parallax. Hipparcos can measure parallax angles as small as 0.001 arcseconds, but not as accurately as bigger shifts. It mapped the distance to 7,000 stars within about 500 light years of the Earth with ...
... Hipparcos is a Earth orbiting satellite which is able to make extremely accurate measurements of parallax. Hipparcos can measure parallax angles as small as 0.001 arcseconds, but not as accurately as bigger shifts. It mapped the distance to 7,000 stars within about 500 light years of the Earth with ...
Astronomy and Space Science
... • The color receptors, called cones, are distributed densely and mainly near the center of vision. • The more sensitive rods can only detect light intensity, and are distributed mainly outside the center of vision. From bright to dark places, it takes 7-10 minutes for saturated rods to become dark a ...
... • The color receptors, called cones, are distributed densely and mainly near the center of vision. • The more sensitive rods can only detect light intensity, and are distributed mainly outside the center of vision. From bright to dark places, it takes 7-10 minutes for saturated rods to become dark a ...
Apparent magnitude
... orbits (in one year ~1 M new stars) The metallicity of young stars increases Open star clusters, interstellar matter Also an “outer” disc of hydrogen (15 000 ly away) and a large disc of warm gas ( ~10 000K) High-velocity clouds (HVC), intermediate-velocity clouds (IVC) “Star ribbons”, caused by dw ...
... orbits (in one year ~1 M new stars) The metallicity of young stars increases Open star clusters, interstellar matter Also an “outer” disc of hydrogen (15 000 ly away) and a large disc of warm gas ( ~10 000K) High-velocity clouds (HVC), intermediate-velocity clouds (IVC) “Star ribbons”, caused by dw ...
galaxy - 106Thursday130-430
... contains the highest density of stars in the galaxy. Although some hot young stars may be found in the nucleus, the primary population of stars there is similar to the old stars found in the halo. ...
... contains the highest density of stars in the galaxy. Although some hot young stars may be found in the nucleus, the primary population of stars there is similar to the old stars found in the halo. ...
At the Heart of the Matter: The Blue White Dwarf in M 57. Paul Temple
... • This much magnitude variation is not in any current models. • Might be a close binary system with Hydrogen loss from one to the other • Extra hydrogen causes some fusion flickering. • Unknown process. ...
... • This much magnitude variation is not in any current models. • Might be a close binary system with Hydrogen loss from one to the other • Extra hydrogen causes some fusion flickering. • Unknown process. ...
December 1, 2011 - Perry Local Schools
... Sometimes the labels are a little different: The vertical position represents the star's luminosity. This could be the luminosity in watts. More commonly it is in units of the Sun's luminosity. In either case, a ``ratio scale'' is used. Absolute magnitude is also com ...
... Sometimes the labels are a little different: The vertical position represents the star's luminosity. This could be the luminosity in watts. More commonly it is in units of the Sun's luminosity. In either case, a ``ratio scale'' is used. Absolute magnitude is also com ...
Beyond solar system
... Nevertheless one is easily inclined to think that the validity of this method is limited to stars near us; in the case of very distant stars the parallax angle becomes so small that it cannot be measured so we have to turn to indirect measuring methods. For instance, one can take into consideration ...
... Nevertheless one is easily inclined to think that the validity of this method is limited to stars near us; in the case of very distant stars the parallax angle becomes so small that it cannot be measured so we have to turn to indirect measuring methods. For instance, one can take into consideration ...
AstroBITS: Open Cluster Project I. Introduction The observational
... masses and begin their lives. Over time, the gravitational pull of the parent galaxy will disrupt clusters but while they last, they present a snapshot of stars that have formed more or less at the same time and at the same place. So these clusters of stars are of great interest to astronomers. We w ...
... masses and begin their lives. Over time, the gravitational pull of the parent galaxy will disrupt clusters but while they last, they present a snapshot of stars that have formed more or less at the same time and at the same place. So these clusters of stars are of great interest to astronomers. We w ...
Project Title: Quantitative Galaxy Evolution Supervisor(s): Project
... Herschel Reference Survey, our Herschel survey of 323 nearby galaxies, for which superb data at all wavelengths exists. The first part of the project will be to use the data to make quantitative estimates of the properties of all the galaxies, such as the rate at which stars are forming in each gala ...
... Herschel Reference Survey, our Herschel survey of 323 nearby galaxies, for which superb data at all wavelengths exists. The first part of the project will be to use the data to make quantitative estimates of the properties of all the galaxies, such as the rate at which stars are forming in each gala ...
Ch.1, Sec.3 - Mapping the Stars
... When you put those numbers together, you get an estimate of 1024 stars in the entire Universe or a 1 followed by 24 zeroes (called one septillion)! That’s 1,000,000,000,000,000,000,000,000 stars or more than all the combined grains of sand on planet Earth!!!! ...
... When you put those numbers together, you get an estimate of 1024 stars in the entire Universe or a 1 followed by 24 zeroes (called one septillion)! That’s 1,000,000,000,000,000,000,000,000 stars or more than all the combined grains of sand on planet Earth!!!! ...
Galaxy clusters - University of Iowa Astrophysics
... • From this, the amount of X-ray emitting gas can be calculated to be 2×1014 M • The mass of X-ray emitting gas is greater than the mass in all the stars in all the galaxies in the cluster and about 10% of the total mass. ...
... • From this, the amount of X-ray emitting gas can be calculated to be 2×1014 M • The mass of X-ray emitting gas is greater than the mass in all the stars in all the galaxies in the cluster and about 10% of the total mass. ...
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.