Basic principles of celestial navigation
... Imagine that a terrestrial observer is located at a fixed point P of unknown latitude % and longitude &. The celestial sphere rotates westward from the observer’s point of view at an angular rate such that the vernal equinox transits !passes through" the observer’s meridian from east to west at inte ...
... Imagine that a terrestrial observer is located at a fixed point P of unknown latitude % and longitude &. The celestial sphere rotates westward from the observer’s point of view at an angular rate such that the vernal equinox transits !passes through" the observer’s meridian from east to west at inte ...
Sec 30.1 - Highland High School
... After reasoning there were globular clusters orbiting the center of the Milky Way, astronomers then used RR Lyrae variables to determine the distances to them. ...
... After reasoning there were globular clusters orbiting the center of the Milky Way, astronomers then used RR Lyrae variables to determine the distances to them. ...
June 2015 - Southern Astronomical Society
... Professor Hawking’s scientific concepts. The material gathered was so rich in personal and conceptual detail that no single documentary could encompass it all. Thus, this volume is much more than a reflection of the film; it is a major expansion of the content. Meticulously annotated with biographic ...
... Professor Hawking’s scientific concepts. The material gathered was so rich in personal and conceptual detail that no single documentary could encompass it all. Thus, this volume is much more than a reflection of the film; it is a major expansion of the content. Meticulously annotated with biographic ...
August 2015 BRAS Newsletter
... from feeling the animal with their hands: one at the side of the elephant thought it was like a wall, one at the trunk thought it was like a snake, and one at the tail thought it was like a rope. Each accurately perceived the elephant in part, but their tactile observations were inconsistent with on ...
... from feeling the animal with their hands: one at the side of the elephant thought it was like a wall, one at the trunk thought it was like a snake, and one at the tail thought it was like a rope. Each accurately perceived the elephant in part, but their tactile observations were inconsistent with on ...
IAC_L4_halo
... Its mass is about 4.108 M and its stars are mostly metal poor, with [Fe/H] between about -1.0 and -3 (some down to at least -5). It is interesting because its stars are probably all old. The halo is spheroidal with axial ratio 0.5 to 0. Its radial density distribution follows (r) ~ r -2.5 to r -4. ...
... Its mass is about 4.108 M and its stars are mostly metal poor, with [Fe/H] between about -1.0 and -3 (some down to at least -5). It is interesting because its stars are probably all old. The halo is spheroidal with axial ratio 0.5 to 0. Its radial density distribution follows (r) ~ r -2.5 to r -4. ...
Chapter 16--Properties of Stars
... unit area (Figure 16.1). (A more technical term for apparent brightness is flux.) The apparent brightness of any light source obeys an inverse square law with distance, similar to the inverse square law that describes the force of gravity [Section 5.3]. If we viewed the Sun from twice Earth’s ...
... unit area (Figure 16.1). (A more technical term for apparent brightness is flux.) The apparent brightness of any light source obeys an inverse square law with distance, similar to the inverse square law that describes the force of gravity [Section 5.3]. If we viewed the Sun from twice Earth’s ...
sections 19-22 instructor notes
... The flatness of the Milky Way system, as evidenced for example by the narrow band of the Milky Way visible from Earth, suggests that the Galaxy has been influenced by general rotation about an axis perpendicular to the Galactic plane. The expected rotation of the Galaxy should be similar to what is ...
... The flatness of the Milky Way system, as evidenced for example by the narrow band of the Milky Way visible from Earth, suggests that the Galaxy has been influenced by general rotation about an axis perpendicular to the Galactic plane. The expected rotation of the Galaxy should be similar to what is ...
sections 19-22 instructor notes
... The flatness of the Milky Way system, as evidenced for example by the narrow band of the Milky Way visible from Earth, suggests that the Galaxy has been influenced by general rotation about an axis perpendicular to the Galactic plane. The expected rotation of the Galaxy should be similar to what is ...
... The flatness of the Milky Way system, as evidenced for example by the narrow band of the Milky Way visible from Earth, suggests that the Galaxy has been influenced by general rotation about an axis perpendicular to the Galactic plane. The expected rotation of the Galaxy should be similar to what is ...
Curiosities of the Sky
... openings at all, but opaque screens cutting off the light from stars behind them. That this is quite possible in some cases is shown by Barnard's later photographs, particularly those of the singular region around the star Rho Ophiuchi. Here are to be seen somber lanes and patches, apparently formin ...
... openings at all, but opaque screens cutting off the light from stars behind them. That this is quite possible in some cases is shown by Barnard's later photographs, particularly those of the singular region around the star Rho Ophiuchi. Here are to be seen somber lanes and patches, apparently formin ...
The accretion properties of the intermediate mass Herbig Ae/Be stars
... § Herbig Ae/Be stars bridge the gap between low and high mass young stars and cover the mass where transition in accretion mode occurs. § Conducted largest spectral survey – 0.4 – 2.4 micron spectra of 90 objects § Determined spectral types, temperatures, radii, reddening in a homogeneous manner ...
... § Herbig Ae/Be stars bridge the gap between low and high mass young stars and cover the mass where transition in accretion mode occurs. § Conducted largest spectral survey – 0.4 – 2.4 micron spectra of 90 objects § Determined spectral types, temperatures, radii, reddening in a homogeneous manner ...
Candidate star clusters toward the inner Milky Way discovered on
... The star cluster searches in the general direction of the inner Milky Way are hampered by two obstacles: extinction and crowding. The clumpy structure of the dust makes it even harder to find clusters because both the often used visual inspection and the algorithms that identify density peaks can ea ...
... The star cluster searches in the general direction of the inner Milky Way are hampered by two obstacles: extinction and crowding. The clumpy structure of the dust makes it even harder to find clusters because both the often used visual inspection and the algorithms that identify density peaks can ea ...
Zinc and chromium abundances in a third
... A detailed description of the procedures used in acquiring and reducing the data can be found in Pettini et al. (1994). Briefly, we used a 1200 grooves mm−1 grating, blazed near 4100 Å, and a thinned 1024 × 1024 pixel Tektronix CCD to record a ≈400 Å wide portion of the spectrum centred at 4121 Å ...
... A detailed description of the procedures used in acquiring and reducing the data can be found in Pettini et al. (1994). Briefly, we used a 1200 grooves mm−1 grating, blazed near 4100 Å, and a thinned 1024 × 1024 pixel Tektronix CCD to record a ≈400 Å wide portion of the spectrum centred at 4121 Å ...
Chapter 1 Telescopes 1.1 Lenses
... the diameter of the objective of a telescope, the greater the number of stars that can be seen. Planets and other astronomical objects in the solar system are magnified using a telescope (unlike stars which are point objects and are seen through telescopes as point images no matter how large the mag ...
... the diameter of the objective of a telescope, the greater the number of stars that can be seen. Planets and other astronomical objects in the solar system are magnified using a telescope (unlike stars which are point objects and are seen through telescopes as point images no matter how large the mag ...
File
... Not all electromagnetic radiation coming from space reaches the Earth's surface. The diagram shows how far radiation from each part of the electromagnetic spectrum travels down through the atmosphere. ...
... Not all electromagnetic radiation coming from space reaches the Earth's surface. The diagram shows how far radiation from each part of the electromagnetic spectrum travels down through the atmosphere. ...
19_Testbank - Lick Observatory
... A) Spheroidal stars orbit in random directions but disk stars have more ordered orbits. B) There are no blue spheroidal stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the spheroid formed earlier than the disk. E) We see evidence for new stars forming in the disk ...
... A) Spheroidal stars orbit in random directions but disk stars have more ordered orbits. B) There are no blue spheroidal stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the spheroid formed earlier than the disk. E) We see evidence for new stars forming in the disk ...
Document
... have Gaussian spread radially, on other half lines have Gaussian spread tangentially. One parameter: macroturbulence zRT (velocity) ...
... have Gaussian spread radially, on other half lines have Gaussian spread tangentially. One parameter: macroturbulence zRT (velocity) ...
in BRIGHTEST STARS
... supergiant star (Ia). Prof. James Kaler, using the figure of 2,600 light years as the distance, estimated a diameter 200 times greater than our sun, and about a quarter of a million times brighter in visible light. Considering its spectral classification (A2), Deneb must have a surface temperature b ...
... supergiant star (Ia). Prof. James Kaler, using the figure of 2,600 light years as the distance, estimated a diameter 200 times greater than our sun, and about a quarter of a million times brighter in visible light. Considering its spectral classification (A2), Deneb must have a surface temperature b ...
Observing binaries with Gaia
... • Millions of binaries of all kinds • Complete statistics near sun • Partial statistics over large parts of the Galaxy • Orbits and masses ...
... • Millions of binaries of all kinds • Complete statistics near sun • Partial statistics over large parts of the Galaxy • Orbits and masses ...
15_Testbank
... 10) Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond. The distance to this star is A) 0.5 light-year. B) 0.5 parsec. C) 5 light-years. D) 5 parsecs. E) 2 parsecs. Answer: E 11) The most distant stars we can measure stellar parallax for are approximately A) 50 pa ...
... 10) Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond. The distance to this star is A) 0.5 light-year. B) 0.5 parsec. C) 5 light-years. D) 5 parsecs. E) 2 parsecs. Answer: E 11) The most distant stars we can measure stellar parallax for are approximately A) 50 pa ...
Stellar Populations For many modern applications, one is not
... The above analytic solutions are only useful for guidance. To compare with observations, predictions must be made in specific bandpasses, or for specific absorption lines. This requires numerical calculations which include 1) sets of stellar isochrones, detailing the precise number of stars at any p ...
... The above analytic solutions are only useful for guidance. To compare with observations, predictions must be made in specific bandpasses, or for specific absorption lines. This requires numerical calculations which include 1) sets of stellar isochrones, detailing the precise number of stars at any p ...
Seeds of a Tychonic Revolution: Telescopic Observations of the
... stars. For example, if Mareo detects annual stellar parallax, that would support the Copernican world system. Consider what Mareo will see when he turns his attention to the stars. His telescope, being diffraction-limited, reveals stars to be disks – like planets but smaller, and like planetary disk ...
... stars. For example, if Mareo detects annual stellar parallax, that would support the Copernican world system. Consider what Mareo will see when he turns his attention to the stars. His telescope, being diffraction-limited, reveals stars to be disks – like planets but smaller, and like planetary disk ...
Full PDF
... Quasars are extremely distant objects in our known universe. They are the furthest objects away from our galaxy that can be seen. Quasars are extremely bright masses of energy and light. The name quasar is actually short for quasi-stellar radio source or quasi-stellar object. They are the brightest ...
... Quasars are extremely distant objects in our known universe. They are the furthest objects away from our galaxy that can be seen. Quasars are extremely bright masses of energy and light. The name quasar is actually short for quasi-stellar radio source or quasi-stellar object. They are the brightest ...
ISA_lecture01 - School of Physics
... A “planet” is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit. A “dwarf planet” is a celestial bo ...
... A “planet” is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit. A “dwarf planet” is a celestial bo ...
The cosmological significance of high
... investigations of its stellar content. The H I mass of the cloud is 2.0 × 107 (d/27 kpc)2 M⊙ , making Complex H one of the most massive HVCs if its distance is more than ∼ 20 kpc. Virtually all similar H I clouds in other galaxy groups are associated with low surface brightness dwarf galaxies. We se ...
... investigations of its stellar content. The H I mass of the cloud is 2.0 × 107 (d/27 kpc)2 M⊙ , making Complex H one of the most massive HVCs if its distance is more than ∼ 20 kpc. Virtually all similar H I clouds in other galaxy groups are associated with low surface brightness dwarf galaxies. We se ...
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.