Document
... the idea that time is restricted to a single dimension of spacetime. We introduce the novel idea that time is properly modeled as a geometric object. In addition to the trivial directionality associated with past and future, time is associated with relative geometric directionality associated with m ...
... the idea that time is restricted to a single dimension of spacetime. We introduce the novel idea that time is properly modeled as a geometric object. In addition to the trivial directionality associated with past and future, time is associated with relative geometric directionality associated with m ...
1 Distance: A History of Parallax and Brief Introduction to Standard
... universe. The only person from antiquity to be truly impressed with his theory was Seleucus of Seleucia, either a Chaldean or Babylonian astronomer [Ferguson 28]. The changes in brightness of the planets could easily be accounted for in a heliocentric model. The distances between planets continuousl ...
... universe. The only person from antiquity to be truly impressed with his theory was Seleucus of Seleucia, either a Chaldean or Babylonian astronomer [Ferguson 28]. The changes in brightness of the planets could easily be accounted for in a heliocentric model. The distances between planets continuousl ...
Ancient Egyptian Astronomy
... Many of the earliest Indian astronomers made discoveries that were far ahead of their western counterparts. Aryabhatta - was born in 476 A.D., and is widely recognized as the father of Indian astronomy. When he was about 25 years old, he presented astronomical and mathematical theories in which the ...
... Many of the earliest Indian astronomers made discoveries that were far ahead of their western counterparts. Aryabhatta - was born in 476 A.D., and is widely recognized as the father of Indian astronomy. When he was about 25 years old, he presented astronomical and mathematical theories in which the ...
The surface composition of Beta Pictoris
... Why does the signature of accretion not show up in the surface composition of β Pic? Accretion of gas depleted in refractory elements is thought to be responsible for the deficiency pattern of λ Boo stars, and direct evidence for the presence of CS matter is accumulating (e.g. Stürenburg 1993; HRH9 ...
... Why does the signature of accretion not show up in the surface composition of β Pic? Accretion of gas depleted in refractory elements is thought to be responsible for the deficiency pattern of λ Boo stars, and direct evidence for the presence of CS matter is accumulating (e.g. Stürenburg 1993; HRH9 ...
Lectures 19-20 The Milky Way Galaxy
... The Morphology of the Galaxy Structure of Thin and Thick Disks Galactic Disk has two major components, the thin disk, and the thick disk. Thin disk: composed of young stars, dust, and gas, with Hnthin = 350 pc (youngest stars found with scale height of 35-90 pc). Thick disk: older stars with a scal ...
... The Morphology of the Galaxy Structure of Thin and Thick Disks Galactic Disk has two major components, the thin disk, and the thick disk. Thin disk: composed of young stars, dust, and gas, with Hnthin = 350 pc (youngest stars found with scale height of 35-90 pc). Thick disk: older stars with a scal ...
Luminosity, Flux and Magnitudes Outline
... All objects have internal energy which is manifested by the microscopic motions of particles. There is a continuum of energy levels associated with this motion. If the object is in thermal equilibrium then it can be characterized by a single quantity, it’s temperature. An object in thermal equilibri ...
... All objects have internal energy which is manifested by the microscopic motions of particles. There is a continuum of energy levels associated with this motion. If the object is in thermal equilibrium then it can be characterized by a single quantity, it’s temperature. An object in thermal equilibri ...
Stellar populations
... The locus of stars which have just started to shine • Subgiant branch Stars that have just exhausted H in their cores, and are now moving off the main sequence • Red giants Evolved stars in upper right-hand part of diagram with either He cores, or they are burning He to C and O in their cores. They ...
... The locus of stars which have just started to shine • Subgiant branch Stars that have just exhausted H in their cores, and are now moving off the main sequence • Red giants Evolved stars in upper right-hand part of diagram with either He cores, or they are burning He to C and O in their cores. They ...
DUSTY CIRCUMSTELLAR DISKS B. Zuckerman
... It has not been easy to find old T Tauri stars, in the 10- to 20-million-year range, because such stars are hard to identify with IR and optical techniques. Recently, surveys of X-ray emission, especially with the German ROSAT satellite, have enabled detection of many stars that appear to be old or ...
... It has not been easy to find old T Tauri stars, in the 10- to 20-million-year range, because such stars are hard to identify with IR and optical techniques. Recently, surveys of X-ray emission, especially with the German ROSAT satellite, have enabled detection of many stars that appear to be old or ...
Stellar-mass Black Hole Formation
... high space velocity > 106 km/s -> NS kick or asymmetric mass ejection ...
... high space velocity > 106 km/s -> NS kick or asymmetric mass ejection ...
7 November 2012 X-ray Astrophysics
... at 15,000-80,000 K, yellower stars like our Sun are at 5,000-8000 K and the coolest, reddest stars have temperatures of 2,000-4000K. Of course, many young massive stars are sufficiently hot to produce not just the blue visible light, but also copious amounts of more energetic ultraviolet light. As s ...
... at 15,000-80,000 K, yellower stars like our Sun are at 5,000-8000 K and the coolest, reddest stars have temperatures of 2,000-4000K. Of course, many young massive stars are sufficiently hot to produce not just the blue visible light, but also copious amounts of more energetic ultraviolet light. As s ...
Determining the inclination of the rotation axis of a sun-like Star
... Toutain 1995). The rotation axes of stars are, however, randomly distributed in space. Since the visibility of the pulsation modes with various azimuthal orders m is a function of the angle between the rotation axis and the line of sight, i, this angle cannot be ignored in asteroseismology. The pres ...
... Toutain 1995). The rotation axes of stars are, however, randomly distributed in space. Since the visibility of the pulsation modes with various azimuthal orders m is a function of the angle between the rotation axis and the line of sight, i, this angle cannot be ignored in asteroseismology. The pres ...
script
... Background: Very few people have a comprehensive view of our place in the universe. They think about astronomical objects as disconnected elements, rather than an integrated system. This demonstration takes visitors from our Solar System, the part of the universe with which they are most familiar, o ...
... Background: Very few people have a comprehensive view of our place in the universe. They think about astronomical objects as disconnected elements, rather than an integrated system. This demonstration takes visitors from our Solar System, the part of the universe with which they are most familiar, o ...
THE NEUTRAL GAS DYNAMICS OF THE NEARBY MAGELLANIC
... in footnotes to Table 1) may have conspired to keep this system out of many mainstream local galaxy surveys. As we show in this work, the stellar and gaseous components of UGCA 105 contain rich morphological and kinematic structure. This work presents the first detailed study of the neutral gas dyna ...
... in footnotes to Table 1) may have conspired to keep this system out of many mainstream local galaxy surveys. As we show in this work, the stellar and gaseous components of UGCA 105 contain rich morphological and kinematic structure. This work presents the first detailed study of the neutral gas dyna ...
Astrobiological Stoichiometry
... and Fe in five different stars (the data sets are discussed and the research groups identified by Hinkel, 2012). The maximum abundance measurement minus the minimum for each element within a star is referred to as the ‘‘spread.’’ The observational spread in [Na/H] within HIP 79672, for example, is * ...
... and Fe in five different stars (the data sets are discussed and the research groups identified by Hinkel, 2012). The maximum abundance measurement minus the minimum for each element within a star is referred to as the ‘‘spread.’’ The observational spread in [Na/H] within HIP 79672, for example, is * ...
Comets
... stretch for hundreds of millions of kilometers. The longest tail yet discovered measured more than 500 million kilometers (300 million miles). Comets have two tails—one made of gas, the other of dust. The gas tail is straight and points directly away from the Sun, while the dust tail can be curved. ...
... stretch for hundreds of millions of kilometers. The longest tail yet discovered measured more than 500 million kilometers (300 million miles). Comets have two tails—one made of gas, the other of dust. The gas tail is straight and points directly away from the Sun, while the dust tail can be curved. ...
Can we account for the dust
... Mikako Matsuura Origin’s fellow, Institute of Origins, University College London M.J. Barlow, G.C. Sloan, A.A. Zijlstra, D. Stock, P.A. Whitelock, P. R. Wood, M.-R.L. Cioni, M.A.T. Groenewegen, K.Volk, J. Bernard-Salas, F. Kemper, T. Kodama, E. Lagadec, M. Meixner, S. Srinivasan, C. Szyszka, J.Th. v ...
... Mikako Matsuura Origin’s fellow, Institute of Origins, University College London M.J. Barlow, G.C. Sloan, A.A. Zijlstra, D. Stock, P.A. Whitelock, P. R. Wood, M.-R.L. Cioni, M.A.T. Groenewegen, K.Volk, J. Bernard-Salas, F. Kemper, T. Kodama, E. Lagadec, M. Meixner, S. Srinivasan, C. Szyszka, J.Th. v ...
offprint
... For further modeling to obtain the closest agreement between model and observations, a wide grid across plausible combinations of stellar parameters and pulsation amplitudes was computed, like for µ Cen (Rivinius et al. 2001b, their Table 3). For ω CMa this grid covered three polar effective temperat ...
... For further modeling to obtain the closest agreement between model and observations, a wide grid across plausible combinations of stellar parameters and pulsation amplitudes was computed, like for µ Cen (Rivinius et al. 2001b, their Table 3). For ω CMa this grid covered three polar effective temperat ...
20_Testbank
... expect them all to have the same luminosity; observations of white-dwarf supernovae for which we can measure distance independently confirm that they all have the same luminosity. Since we can assume we know their luminosity, we can use their apparent brightnesses to determine distance from the lumi ...
... expect them all to have the same luminosity; observations of white-dwarf supernovae for which we can measure distance independently confirm that they all have the same luminosity. Since we can assume we know their luminosity, we can use their apparent brightnesses to determine distance from the lumi ...
bode elert johann
... of the second edition, he must regard Halley’s publication of 1712 as the first. The catalogue lists 3175 stars. They are arranged by constellation, starting with Cassiopeia (see Figure 3). The first column, headed “Fl. No”, gives the correct Flamsteed number. The positions (right ascension, declina ...
... of the second edition, he must regard Halley’s publication of 1712 as the first. The catalogue lists 3175 stars. They are arranged by constellation, starting with Cassiopeia (see Figure 3). The first column, headed “Fl. No”, gives the correct Flamsteed number. The positions (right ascension, declina ...
Astrophysics Pristine CNO abundances from Magellanic Cloud B stars
... Large Magellanic Cloud (LMC). Apart from H ii regions, unevolved OB-type stars are currently the only accessible source of present-day CNO abundances for the MCs not altered by stellar evolution. Using UVES on the VLT, we obtained spectra of sufficient resolution (R = 20 000) and signal-to-noise (S/ ...
... Large Magellanic Cloud (LMC). Apart from H ii regions, unevolved OB-type stars are currently the only accessible source of present-day CNO abundances for the MCs not altered by stellar evolution. Using UVES on the VLT, we obtained spectra of sufficient resolution (R = 20 000) and signal-to-noise (S/ ...
Science drivers for GLAO at LBT
... Oph 11 is the most extreme low-mass, wide (>243 AU) binary known. Oph 16 is the 4th least bound system while Oph 11 is the least bound with Vesc<0.5 km/s. Such systems cannot be formed by “ejection” mechanisms. ...
... Oph 11 is the most extreme low-mass, wide (>243 AU) binary known. Oph 16 is the 4th least bound system while Oph 11 is the least bound with Vesc<0.5 km/s. Such systems cannot be formed by “ejection” mechanisms. ...
Why is the Sun very dense on the inside?
... a) Hold your thumb out and blink one eye at a time. Your thumb moves more than the background. b) Driving down a road, a nearby fence appears to shift more than distance scenery. c) Planets shift their position in the sky partly because Earth moves, shifting our position. d) Stars shift their po ...
... a) Hold your thumb out and blink one eye at a time. Your thumb moves more than the background. b) Driving down a road, a nearby fence appears to shift more than distance scenery. c) Planets shift their position in the sky partly because Earth moves, shifting our position. d) Stars shift their po ...
ppt
... early-type main sequence stars But for cool stars there is a degeneracy between main sequence and giant stars. You should see 2 branches if you can measure the color or brightness Avoid stars with B–V values lower than 0.5 ...
... early-type main sequence stars But for cool stars there is a degeneracy between main sequence and giant stars. You should see 2 branches if you can measure the color or brightness Avoid stars with B–V values lower than 0.5 ...
Unit 6
... At latitudes between these, the Sun shines straight down at noon at other times of year. At regions farther north or south, the Sun can never be straight overhead, and the different angles of the Sun as the Earth orbits it can lead to strong differences in heating during the year. Figure 6.6 illustr ...
... At latitudes between these, the Sun shines straight down at noon at other times of year. At regions farther north or south, the Sun can never be straight overhead, and the different angles of the Sun as the Earth orbits it can lead to strong differences in heating during the year. Figure 6.6 illustr ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.