Ecosystems, from life, to the Earth, to the Galaxy
... pressure to support the cloud against further collapse. It releases this energy by emitting radiation through the lines of the atoms and molecules present in it, cooling the cloud. How efficiently a cloud cools is determined by the elemental abundance of the cloud, particularly the presence of carbo ...
... pressure to support the cloud against further collapse. It releases this energy by emitting radiation through the lines of the atoms and molecules present in it, cooling the cloud. How efficiently a cloud cools is determined by the elemental abundance of the cloud, particularly the presence of carbo ...
Constituents of the Milky Way
... For individual stars that aren’t in clusters (like the Sun), we can’t use the cluster turnoff method to measure an age. For instance, a lone G star might be young, or it might be 10 billion years old. How do we measure its age? The universe contained only hydrogen, helium, and one other element (lit ...
... For individual stars that aren’t in clusters (like the Sun), we can’t use the cluster turnoff method to measure an age. For instance, a lone G star might be young, or it might be 10 billion years old. How do we measure its age? The universe contained only hydrogen, helium, and one other element (lit ...
(pdf)
... The possibility of observing a toroidal atmosphere in absorption when a giant planet transits the disk of its parent star is determined not only by the amount of material and the dimensions of the cloud, but also by the geometry of the observation. The orbital period of planet HD 209458b is short, 3 ...
... The possibility of observing a toroidal atmosphere in absorption when a giant planet transits the disk of its parent star is determined not only by the amount of material and the dimensions of the cloud, but also by the geometry of the observation. The orbital period of planet HD 209458b is short, 3 ...
Sagittarius
... These arcs are measured from the point where the Sun crosses the celestial equator at the beginning of Spring on or about March 21st each year. As this is coincidental with the position of the Earth's axis at right angles to the radius of its orbit, the days and nights are of equal duration all over ...
... These arcs are measured from the point where the Sun crosses the celestial equator at the beginning of Spring on or about March 21st each year. As this is coincidental with the position of the Earth's axis at right angles to the radius of its orbit, the days and nights are of equal duration all over ...
Assignment 3 - Physics Internal Website
... The stellar temperature axis is often characterized by spectral classification rather than temperature. The standard spectral classification goes as O, B, A, F, G, K, M, (and for brown dwarfs L, T). The earlier in the alphabet the more prominent the H Balmer series, so A stars have the most promine ...
... The stellar temperature axis is often characterized by spectral classification rather than temperature. The standard spectral classification goes as O, B, A, F, G, K, M, (and for brown dwarfs L, T). The earlier in the alphabet the more prominent the H Balmer series, so A stars have the most promine ...
So, what`s the problem for high
... physicists who built IR detectors and put them on telescopes. The first important far-ir source was the Galactic Center, discovered by a one-inch telescope on a high altitude balloon. It’s luminosity comes largely from formation of high-mass stars. The Infrared Astronomy Satellite (IRAS) discovered ...
... physicists who built IR detectors and put them on telescopes. The first important far-ir source was the Galactic Center, discovered by a one-inch telescope on a high altitude balloon. It’s luminosity comes largely from formation of high-mass stars. The Infrared Astronomy Satellite (IRAS) discovered ...
The Fundamental Plane, Stellar Popula6ons
... What is the relaBon between stellar mass and dynamical mass, and how does this vary with parent halo mass & environment? How do the observed trends in stellar populaBons vary with environment (NN/local density/cluster radius/cluster richness)? What is origin of the ‘Blt’ of the FP and its ...
... What is the relaBon between stellar mass and dynamical mass, and how does this vary with parent halo mass & environment? How do the observed trends in stellar populaBons vary with environment (NN/local density/cluster radius/cluster richness)? What is origin of the ‘Blt’ of the FP and its ...
Dynamics of elliptical galaxies
... Recall that for an elliptical galaxy we can define an effective radius Re - radius of a circle which contains half of the total light in the galaxy. Measure three apparently independent properties; • The effective radius Re • The central velocity dispersion s • The surface brightness at the effectiv ...
... Recall that for an elliptical galaxy we can define an effective radius Re - radius of a circle which contains half of the total light in the galaxy. Measure three apparently independent properties; • The effective radius Re • The central velocity dispersion s • The surface brightness at the effectiv ...
Testing
... We observe the star–gas–star cycle operating in Milky Way’s disk using many different wavelengths of light. The Milky Way in Multiple Wavelengths ...
... We observe the star–gas–star cycle operating in Milky Way’s disk using many different wavelengths of light. The Milky Way in Multiple Wavelengths ...
Stellar population models in the Near-Infrared Meneses
... els, with slopes of −3.0 and −3.5) and a model that follows the IMF recipe of Chabrier with parameter χ = −1.3. The different initial mass function tests presented there give us insights into the complex star formation scenario that these early-type galaxies present. In future work, we will need to ...
... els, with slopes of −3.0 and −3.5) and a model that follows the IMF recipe of Chabrier with parameter χ = −1.3. The different initial mass function tests presented there give us insights into the complex star formation scenario that these early-type galaxies present. In future work, we will need to ...
EarthScience-Astronomy-TheSolarSystem
... North Pole the apparent rotation would be a full circle of 360° each 24hour day, or about 15° per hour. The further south you go, the slower the apparent rotation gets, and at the equator there is no rotation at all. Below the equator the apparent rotation begins again, but in the opposite direction ...
... North Pole the apparent rotation would be a full circle of 360° each 24hour day, or about 15° per hour. The further south you go, the slower the apparent rotation gets, and at the equator there is no rotation at all. Below the equator the apparent rotation begins again, but in the opposite direction ...
Document
... thus, at a certain point, the newly forming object becomes visible. At this stage the large luminous body is called a protostar. The other half of its gravitational energy remains within the protostar as heat. As contraction continues, the internal temperature of the protostar keeps rising, and when ...
... thus, at a certain point, the newly forming object becomes visible. At this stage the large luminous body is called a protostar. The other half of its gravitational energy remains within the protostar as heat. As contraction continues, the internal temperature of the protostar keeps rising, and when ...
A Hero`s Little Horse: Discovery of a Dissolving Star Cluster in
... the underlying stellar distribution. We obtain a half-light radius of 1.2 ± 0.1 arcmin or rh = 6.9 ± 0.6 pc, adopting the distance modulus of 16.48 mag. In analogy to Walsh et al. (2008) we estimate the total luminosity of Kim 1 by integrating the radial number density profile shown in Figure 6 to c ...
... the underlying stellar distribution. We obtain a half-light radius of 1.2 ± 0.1 arcmin or rh = 6.9 ± 0.6 pc, adopting the distance modulus of 16.48 mag. In analogy to Walsh et al. (2008) we estimate the total luminosity of Kim 1 by integrating the radial number density profile shown in Figure 6 to c ...
Gaps
... Recio-Blanco et al., ApJL 572, 2002 • Fast HB rotation, although maybe not present in all clusters, is a fairly common feature. ...
... Recio-Blanco et al., ApJL 572, 2002 • Fast HB rotation, although maybe not present in all clusters, is a fairly common feature. ...
1 Lecture 8: Uranus and Neptune
... – discovered by British William Herschel in 1781, first discovery of a planet in over 2000 years – apparent magnitude is at the edge of the naked eye’s ability to see, if you know exactly where it is – discovered through optical telescope – orbital semimajor axis: 19.19 AU, mass: 14.54 earth masses ...
... – discovered by British William Herschel in 1781, first discovery of a planet in over 2000 years – apparent magnitude is at the edge of the naked eye’s ability to see, if you know exactly where it is – discovered through optical telescope – orbital semimajor axis: 19.19 AU, mass: 14.54 earth masses ...
Coordinate Systems - AST 114, Astronomy Lab II for Spring 2017!
... The ecliptic is the apparent path of the Sun, Moon, and planets as seen from the Earth. In another sense, the ecliptic is the path of the Earth’s orbit projected onto the sky. The orbits of the Earth and most of the other planets move in a relatively flat plane around the Sun. ...
... The ecliptic is the apparent path of the Sun, Moon, and planets as seen from the Earth. In another sense, the ecliptic is the path of the Earth’s orbit projected onto the sky. The orbits of the Earth and most of the other planets move in a relatively flat plane around the Sun. ...
sections 16-18 instructor notes
... Galaxy, and ideally only well-mixed groups that have orbited the Galactic centre at least once appear to yield an uncontaminated value for v. Evidence for the distinct nature of older stars from those that have not traveled far from their places of birth can be found in Parenago’s discontinuity, wh ...
... Galaxy, and ideally only well-mixed groups that have orbited the Galactic centre at least once appear to yield an uncontaminated value for v. Evidence for the distinct nature of older stars from those that have not traveled far from their places of birth can be found in Parenago’s discontinuity, wh ...
Globular Clusters
... the appropriate statistical significance among the GC stars. This allows a direct check on the validity of the detailed evolution theory. When GCs are considered just as a million or so pointlike masses in a small volume, subject to internal and external dynamical interactions, they represent an ide ...
... the appropriate statistical significance among the GC stars. This allows a direct check on the validity of the detailed evolution theory. When GCs are considered just as a million or so pointlike masses in a small volume, subject to internal and external dynamical interactions, they represent an ide ...
129 DYNAMICAL STREAMS IN THE SOLAR NEIGHBOURHOOD B
... of global dynamical mechanisms. Kalnajs (1991) suggested that a rotating bar at the centre of the Milky Way could cause the velocity distribution in the vicinity of the outer Lindblad resonance to become bimodal, due to the coexistence of orbits elongated along and perpendicular to the bar’s major a ...
... of global dynamical mechanisms. Kalnajs (1991) suggested that a rotating bar at the centre of the Milky Way could cause the velocity distribution in the vicinity of the outer Lindblad resonance to become bimodal, due to the coexistence of orbits elongated along and perpendicular to the bar’s major a ...
Aquarius (constellation)
Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for ""water-carrier"" or ""cup-carrier"", and its symbol is 20px (Unicode ♒), a representation of water.Aquarius is one of the oldest of the recognized constellations along the zodiac (the sun's apparent path). It was one of the 48 constellations listed by the 2nd century AD astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.