Senior thesis - University of Texas Astronomy Home Page
... every field of astronomy. Using precision asteroseismology, we can explore, for example, a star’s mass, rotation rate, equation of state, and nuclear reaction rates. By studying the rate of change of WD pulsations we can explore galactic time measurements, orbiting planets, dark matter theories, or ...
... every field of astronomy. Using precision asteroseismology, we can explore, for example, a star’s mass, rotation rate, equation of state, and nuclear reaction rates. By studying the rate of change of WD pulsations we can explore galactic time measurements, orbiting planets, dark matter theories, or ...
Binary Star Formation Part 2
... Higher initial densities then are observed in molecular clouds (clouds typically 102 cm-3 whereas simulations start at ~105 cm-3) ...
... Higher initial densities then are observed in molecular clouds (clouds typically 102 cm-3 whereas simulations start at ~105 cm-3) ...
A Zoo of Galaxies
... changed a lot over the last century or two is a bit of an understatement. In 1845 the state of the art picture of an external galaxy, was an image of M51, or the Whirlpool galaxy drawn by William Parsons, Third Earl of Rosse (1800-1867), looking through what at the time was the largest telescope in ...
... changed a lot over the last century or two is a bit of an understatement. In 1845 the state of the art picture of an external galaxy, was an image of M51, or the Whirlpool galaxy drawn by William Parsons, Third Earl of Rosse (1800-1867), looking through what at the time was the largest telescope in ...
A Zoo of Galaxies - Portsmouth Research Portal
... changed a lot over the last century or two is a bit of an understatement. In 1845 the state of the art picture of an external galaxy, was an image of M51, or the Whirlpool galaxy drawn by William Parsons, Third Earl of Rosse (1800-1867), looking through what at the time was the largest telescope in ...
... changed a lot over the last century or two is a bit of an understatement. In 1845 the state of the art picture of an external galaxy, was an image of M51, or the Whirlpool galaxy drawn by William Parsons, Third Earl of Rosse (1800-1867), looking through what at the time was the largest telescope in ...
ppt file - Universitat de Barcelona
... Why do stars preferently form closely packed rather than in isolation? Nobody knows (up to now) the answer, but we can gain insight by: ...
... Why do stars preferently form closely packed rather than in isolation? Nobody knows (up to now) the answer, but we can gain insight by: ...
Ellipticity, Its Origin and Progression in Comoving Galaxies
... The DSSU is essentially structured as Voronoi cells on a cosmic scale. Each cell has a vast central region (commonly called a void) in which the universal space medium is involved in a process of expansion; it is a region of space-medium expansion. Each cell is enclosed by a shared "boundary" region ...
... The DSSU is essentially structured as Voronoi cells on a cosmic scale. Each cell has a vast central region (commonly called a void) in which the universal space medium is involved in a process of expansion; it is a region of space-medium expansion. Each cell is enclosed by a shared "boundary" region ...
telling time at night
... Once you have determined the north direction, look up about one-third* of the way from horizon to zenith, the top of the sky. The North Star is fairly bright (second magnitude) and visible from the city, but not as bright as the brightest stars (first magnitude). The Big Dipper rotates around the No ...
... Once you have determined the north direction, look up about one-third* of the way from horizon to zenith, the top of the sky. The North Star is fairly bright (second magnitude) and visible from the city, but not as bright as the brightest stars (first magnitude). The Big Dipper rotates around the No ...
Title: Binary interaction dominates the evolution of massive stars
... properties of only very few of the young O stars in our sample (see supporting online material §A.2), our derived distributions are a good representation of the binary properties at birth. Thus it is safe to conclude that the most common end product of massive star formation is a rather close binary ...
... properties of only very few of the young O stars in our sample (see supporting online material §A.2), our derived distributions are a good representation of the binary properties at birth. Thus it is safe to conclude that the most common end product of massive star formation is a rather close binary ...
Application Exercise: Distances to Stars Using Measured Parallax
... your index finger relative to a distance background while you alternate opening and closing each eye. Does your finger seem to jump back and forth relative to the background? This is because the centers of your eyes are 5 – 6 centimeters apart, so each eye has a different point of view. Because star ...
... your index finger relative to a distance background while you alternate opening and closing each eye. Does your finger seem to jump back and forth relative to the background? This is because the centers of your eyes are 5 – 6 centimeters apart, so each eye has a different point of view. Because star ...
THE DAWN OF X-RAY ASTRONOMY
... X-rays of energy greater than several hundreds of electron volts can penetrate the interstellar gas over distances comparable to the size of our own galaxy, with greater or lesser absorption depending on the direction of the line of sight. At energies of a few kilovolts, x-rays can penetrate the ent ...
... X-rays of energy greater than several hundreds of electron volts can penetrate the interstellar gas over distances comparable to the size of our own galaxy, with greater or lesser absorption depending on the direction of the line of sight. At energies of a few kilovolts, x-rays can penetrate the ent ...
Discovery of White Dwarfs—8 Oct
... Main-sequence or dwarf stars Giants Horizontal-branch stars White dwarfs are too faint for these observations. A star lives a long time as a dwarf. It is on the main sequence. When it runs out of fuel, it becomes a giant and subsequently “traces out the giant branch.” ...
... Main-sequence or dwarf stars Giants Horizontal-branch stars White dwarfs are too faint for these observations. A star lives a long time as a dwarf. It is on the main sequence. When it runs out of fuel, it becomes a giant and subsequently “traces out the giant branch.” ...
Section 2
... Orion constellations. For example, a large constellation in the winter sky is named Orion, the Hunter, after a Greek myth. In this constellation, Orion is seen with a sword in his belt and an upraised arm. The ancient Sumerians thought that the stars in Orion formed the outline of a sheep. In anci ...
... Orion constellations. For example, a large constellation in the winter sky is named Orion, the Hunter, after a Greek myth. In this constellation, Orion is seen with a sword in his belt and an upraised arm. The ancient Sumerians thought that the stars in Orion formed the outline of a sheep. In anci ...
Star Formation in the Galaxy, An Observational Overview
... to as brown dwarfs.) Stars with larger masses are presumably too luminous to hold on to their outer atmospheres. Once a star exhausts its supply of hydrogen in its central core, nuclear reactions there plummet and the helium-rich core contracts unable to support itself against gravity. The contracti ...
... to as brown dwarfs.) Stars with larger masses are presumably too luminous to hold on to their outer atmospheres. Once a star exhausts its supply of hydrogen in its central core, nuclear reactions there plummet and the helium-rich core contracts unable to support itself against gravity. The contracti ...
Test Ch. 27 Multiple Choice Identify the choice that best completes
... 25. In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a A. black dwarf. B. red supergiant. C. white dwarf. D. black hole. 26. In which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a star’s outer shell to ...
... 25. In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a A. black dwarf. B. red supergiant. C. white dwarf. D. black hole. 26. In which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a star’s outer shell to ...
20_Testbank
... C) a class of objects in astronomy that all have exactly the same luminosity D) any star for which we know the exact apparent brightness E) a long, tapered candle that lights easily Answer: A ...
... C) a class of objects in astronomy that all have exactly the same luminosity D) any star for which we know the exact apparent brightness E) a long, tapered candle that lights easily Answer: A ...
The Magellan 20 Telescope Science Goals
... in the plane of the sky. A 3D tomographic reconstruction of the mass distribution and kinematics of the IGM becomes possible, mapping tenuous structures with densities down to the mean density of the universe. A combination with a traditional galaxy redshift survey of the same volume sampled by the ...
... in the plane of the sky. A 3D tomographic reconstruction of the mass distribution and kinematics of the IGM becomes possible, mapping tenuous structures with densities down to the mean density of the universe. A combination with a traditional galaxy redshift survey of the same volume sampled by the ...
The new X-ray universe
... of them, then this may account for the bulk of the baryonic mass at this scale. Chandra’s resolution makes it a robust tool for mass determination in galaxy clusters. In Abell 2390, Abell 1835 and RXJ1347.5-1145, all X-ray luminous, relatively relaxed clusters of galaxies, the mass profiles determin ...
... of them, then this may account for the bulk of the baryonic mass at this scale. Chandra’s resolution makes it a robust tool for mass determination in galaxy clusters. In Abell 2390, Abell 1835 and RXJ1347.5-1145, all X-ray luminous, relatively relaxed clusters of galaxies, the mass profiles determin ...
Star Clusters in Mergers
... their distance), hence only slightly fainter. Statistics not different physics. ...
... their distance), hence only slightly fainter. Statistics not different physics. ...
Stellar populations in the nuclear regions of nearby radio galaxies
... time, offers a wide spectral span: l3350–6000 A at 3.5-Å resolution in resolution in the blue and l7900–9400 A the red. In the 1997 run, in which we assessed the viability of the project, we used the R600B and R600R gratings instead. This setup and l8510–9320 A range in the blue and covers th ...
... time, offers a wide spectral span: l3350–6000 A at 3.5-Å resolution in resolution in the blue and l7900–9400 A the red. In the 1997 run, in which we assessed the viability of the project, we used the R600B and R600R gratings instead. This setup and l8510–9320 A range in the blue and covers th ...
Constellation Classification Cards*
... 5. Ask the students from each constellation to identify themselves. As in the U-shaped model in Activity #1, the model should begin with the Sun and Sirius and end with Aludra from the constellation Canis Major. 6. Ask the students to consult their cards to find their brightness. A “0” on the brigh ...
... 5. Ask the students from each constellation to identify themselves. As in the U-shaped model in Activity #1, the model should begin with the Sun and Sirius and end with Aludra from the constellation Canis Major. 6. Ask the students to consult their cards to find their brightness. A “0” on the brigh ...
CONSTELLATION PERSEUS The constellation
... the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west. Some star atlases during the early 19th century also depicted Perseus holding onto the head of the Medusa, whose asterism was named together as Perseus et Caput Medusae, however, this never came into popular usag ...
... the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west. Some star atlases during the early 19th century also depicted Perseus holding onto the head of the Medusa, whose asterism was named together as Perseus et Caput Medusae, however, this never came into popular usag ...
Galaxies - WordPress.com
... as our galaxy ages over the next few billion years it will A not change at all B get smaller and become an elliptical galaxy C get fainter till it fades from view ...
... as our galaxy ages over the next few billion years it will A not change at all B get smaller and become an elliptical galaxy C get fainter till it fades from view ...
PowerPoint Presentation - 16. Properties of Stars
... brightest star on a cluster’s main sequence is called the ...
... brightest star on a cluster’s main sequence is called the ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.