Part 1
... atop one another so the background stars (circles) line up. There are two nearby stars also shown. Which of these nearby stars is closer? ...
... atop one another so the background stars (circles) line up. There are two nearby stars also shown. Which of these nearby stars is closer? ...
Lecture 11
... • An alternative unit of astronomical distance is the Light Year (ly). • 1 Light Year is the distance traveled by light in one year. • 1 light year (ly) is equivalent to: – 0.31 pc ...
... • An alternative unit of astronomical distance is the Light Year (ly). • 1 Light Year is the distance traveled by light in one year. • 1 light year (ly) is equivalent to: – 0.31 pc ...
Volume 4 (Issue 3), March 2015
... surrounding the evolution of galaxies, deepening our understanding of the future of the Milky Way. The supermassive black holes in the cores of some galaxies drive massive outflows of molecular hydrogen gas. As a result, most of the cold gas is expelled from the galaxies. Since cold gas is required ...
... surrounding the evolution of galaxies, deepening our understanding of the future of the Milky Way. The supermassive black holes in the cores of some galaxies drive massive outflows of molecular hydrogen gas. As a result, most of the cold gas is expelled from the galaxies. Since cold gas is required ...
Star Constellations
... Ancient Babylonian astronomers created the Zodiac. The Zodiac is a circle that divides the ecliptic into twelve 30-degree zones. Each zone contains a constellation, many of them animals. Horoscopes based on these astrological signs first appeared in Ptolemaic Egypt in around 50 BC. These early peopl ...
... Ancient Babylonian astronomers created the Zodiac. The Zodiac is a circle that divides the ecliptic into twelve 30-degree zones. Each zone contains a constellation, many of them animals. Horoscopes based on these astrological signs first appeared in Ptolemaic Egypt in around 50 BC. These early peopl ...
Document
... Earth in the form of radiation. [Clarification Statement: Emphasis is on the energy transfer mechanisms that allow energy from nuclear fusion in the sun’s core to reach Earth. Examples of evidence for the model include observations of the masses and lifetimes of other stars, as well as the ways that ...
... Earth in the form of radiation. [Clarification Statement: Emphasis is on the energy transfer mechanisms that allow energy from nuclear fusion in the sun’s core to reach Earth. Examples of evidence for the model include observations of the masses and lifetimes of other stars, as well as the ways that ...
Lecture 8: The Stars - Department of Physics and Astronomy
... the oldest globular clusters reveals that they are about 13 billion years old ...
... the oldest globular clusters reveals that they are about 13 billion years old ...
V Example: our SUN (G2V)
... Denser stars with higher surface gravity will exhibit greater pressure broadening of spectral lines. Since the radius of a giant star is much greater than a dwarf star while their masses are roughly comparable, the gravity and thus the gas density and pressure on the surface of a giant star are much ...
... Denser stars with higher surface gravity will exhibit greater pressure broadening of spectral lines. Since the radius of a giant star is much greater than a dwarf star while their masses are roughly comparable, the gravity and thus the gas density and pressure on the surface of a giant star are much ...
Super Giant
... Explain why the moon revolves around the Earth instead of the Sun. Even though the moon is larger than Pluto, which DOES revolve around the Sun, The moon revolves around the Earth because it is CLOSER to the Earth. The two factors that determine the force of gravity are mass and distance. What relat ...
... Explain why the moon revolves around the Earth instead of the Sun. Even though the moon is larger than Pluto, which DOES revolve around the Sun, The moon revolves around the Earth because it is CLOSER to the Earth. The two factors that determine the force of gravity are mass and distance. What relat ...
Small Wonders: Canes Venatici
... on by both Ursa Major and Bootes, Canes is located in a somewhat barren section of the night sky. Canes (whose name means The Hunting Dogs) has been seen as Bootes pets for at least several hundred years, but the constellation may not have been "stand alone" until sometime in the late 17th century w ...
... on by both Ursa Major and Bootes, Canes is located in a somewhat barren section of the night sky. Canes (whose name means The Hunting Dogs) has been seen as Bootes pets for at least several hundred years, but the constellation may not have been "stand alone" until sometime in the late 17th century w ...
Option E Sum Pages
... Information from the spectra and spectral classes Light is produced in nuclear fission reactions deep in the core of a star and is absorbed and re-emitted many times on its way out to the surface, and therefore has a rather continuous distribution of wavelengths. Chemical elements, ions and molecule ...
... Information from the spectra and spectral classes Light is produced in nuclear fission reactions deep in the core of a star and is absorbed and re-emitted many times on its way out to the surface, and therefore has a rather continuous distribution of wavelengths. Chemical elements, ions and molecule ...
Long Ago and Far Away
... small angle formula breaks down for large cosmological distances, but just assume it works approximately.) Spitzer can resolve details as small as a few arcseconds. If this ultraluminous infrared galaxy were observed in the distant, 5 billion-year-old universe, would Spitzer recognize the galaxy as ...
... small angle formula breaks down for large cosmological distances, but just assume it works approximately.) Spitzer can resolve details as small as a few arcseconds. If this ultraluminous infrared galaxy were observed in the distant, 5 billion-year-old universe, would Spitzer recognize the galaxy as ...
The Fate of the X-ray Emitting Gas in the Early
... Source of cold gas: Velocity dispersion of the GMAs is 122 km s-1, which is less than the stellar velocity dispersion of 237 km s-1. Several GMAs are likely on infalling, nearly radial orbits No disk-like structures GMAs have a nearly azimuthially symmetric distribution Mass deposition rat ...
... Source of cold gas: Velocity dispersion of the GMAs is 122 km s-1, which is less than the stellar velocity dispersion of 237 km s-1. Several GMAs are likely on infalling, nearly radial orbits No disk-like structures GMAs have a nearly azimuthially symmetric distribution Mass deposition rat ...
Target Stars for Earth-like Planet Searches with the Terrestrial
... through low-resolution spectroscopy and other measurements. The high contrast ratio between a star and any nearby planet, the small angular scale required, and the possibility of dust emission masking the planet's signature, combine to make the overall TPF problem challenging. ...
... through low-resolution spectroscopy and other measurements. The high contrast ratio between a star and any nearby planet, the small angular scale required, and the possibility of dust emission masking the planet's signature, combine to make the overall TPF problem challenging. ...
Paper - Astrophysics - University of Oxford
... terrestrial planets orbiting nearby stars in ``habitable zones’’ (masses < 10MEARTH and temperatures~270-320K). By imaging over several epochs, the orbits of these planets can be mapped. Variations in their photometric properties then can be used to determine the albedos (reflectivities), and thereb ...
... terrestrial planets orbiting nearby stars in ``habitable zones’’ (masses < 10MEARTH and temperatures~270-320K). By imaging over several epochs, the orbits of these planets can be mapped. Variations in their photometric properties then can be used to determine the albedos (reflectivities), and thereb ...
Good Vibrations and Stellar Pulsations - Physics
... homepage.mac.com/kvmagruder/bcp/aster/constellations/Sgr.htm ...
... homepage.mac.com/kvmagruder/bcp/aster/constellations/Sgr.htm ...
White Dwarfs & Other Ends March 21 − Stars with < 2 M
... O è Mg, Score never gets hot enough2x10 further reactions. ...
... O è Mg, Score never gets hot enough2x10 further reactions. ...
10.1 Introduction
... In summary, scaling from the solar parameters, the low mass end of the Main Sequence of hydrogen burning stars is expected to occur at L ∼ 10−3 L , Teff ∼ 1700 K. The value of Lmin thus derived matches observations, while that of Teff,min is about a factor of two too low (see Figure 10.5). One reas ...
... In summary, scaling from the solar parameters, the low mass end of the Main Sequence of hydrogen burning stars is expected to occur at L ∼ 10−3 L , Teff ∼ 1700 K. The value of Lmin thus derived matches observations, while that of Teff,min is about a factor of two too low (see Figure 10.5). One reas ...
Endpoints of stellar evolution
... Contribution of Massive Stars to Galactic Nucleosynthesis Displayed is the overproduction factor X/Xsolar This is the fraction of matter in the Galaxy that had to be processed through the scenario (massive stars here) to account for todays observed solar abundances. To explain the origin of the ele ...
... Contribution of Massive Stars to Galactic Nucleosynthesis Displayed is the overproduction factor X/Xsolar This is the fraction of matter in the Galaxy that had to be processed through the scenario (massive stars here) to account for todays observed solar abundances. To explain the origin of the ele ...
S T A R S
... order. The brightest star is Epsilon (Kaus Australis). Behind Gamma Sagittarii are some bright star clouds in the Milky Way and this region marks the central hub of our galaxy. There are some curious winding lanes of dust in that area. Gamma has a yellow tint. Connected by a solid line in the diagra ...
... order. The brightest star is Epsilon (Kaus Australis). Behind Gamma Sagittarii are some bright star clouds in the Milky Way and this region marks the central hub of our galaxy. There are some curious winding lanes of dust in that area. Gamma has a yellow tint. Connected by a solid line in the diagra ...
Astronomy Glossary Key
... object is, the greater the force of gravity, the closer the object is the greater the force. In 1925 Hubble was first to notice that the light from hydrogen starlight was shifted towards the red end of the spectrum. This proves all stars are moving away from each other so the universe must be expand ...
... object is, the greater the force of gravity, the closer the object is the greater the force. In 1925 Hubble was first to notice that the light from hydrogen starlight was shifted towards the red end of the spectrum. This proves all stars are moving away from each other so the universe must be expand ...
Chandra Emission Line Diagnostics of Sco
... interaction of convection and rotation. It was theorized that hot stars did not have this convective envelope. However, some recent observations support the existence of magnetic fields and possibly magnetic activity as well in massive stars. Currently there are two prominent theories as to the sour ...
... interaction of convection and rotation. It was theorized that hot stars did not have this convective envelope. However, some recent observations support the existence of magnetic fields and possibly magnetic activity as well in massive stars. Currently there are two prominent theories as to the sour ...
Slide 1
... system. Both masses equal => center of mass is in the middle, rA = rB. The more unequal the masses are, the more it shifts toward the more massive star. ...
... system. Both masses equal => center of mass is in the middle, rA = rB. The more unequal the masses are, the more it shifts toward the more massive star. ...
Chapter 17
... The discovery of At the turn of the 20th century astronomers believed the Milky Way other galaxies galaxy was the entire universe. As telescopes got better, though, some “smudges” that were thought to be nebulae in the Milky Way were recognized to be whole galaxies far outside our own. The discovery ...
... The discovery of At the turn of the 20th century astronomers believed the Milky Way other galaxies galaxy was the entire universe. As telescopes got better, though, some “smudges” that were thought to be nebulae in the Milky Way were recognized to be whole galaxies far outside our own. The discovery ...
Star names and magnitudes
... Some stars which are too faint to be seen with the naked eye are identified by a catalogue number, eg ...
... Some stars which are too faint to be seen with the naked eye are identified by a catalogue number, eg ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.