The Dual Nature of Light
... • large pixel sizes compared to plates, overall small coverage • low blue response • long readout times for large arrays ...
... • large pixel sizes compared to plates, overall small coverage • low blue response • long readout times for large arrays ...
The Solar System (Ch. 6 in text) The solar system consists of the Sun
... system by the intense stellar winds that are observed around all young stars. (See Fig. 15.4) But some solid particles were “left over,” since we now know of many “debris disks” around older stars. The whole process probably took 10 to100 million years, although this is wildly uncertain. The main th ...
... system by the intense stellar winds that are observed around all young stars. (See Fig. 15.4) But some solid particles were “left over,” since we now know of many “debris disks” around older stars. The whole process probably took 10 to100 million years, although this is wildly uncertain. The main th ...
A Global Citizen of the Skies
... Figure 1 and 2 show two examples of stellar constellations created during the activity a member of the ‘Natives’ and ‘Explorers’ group, respectively. Already a clear impact of the cultural background of each group can be detected. The ‘Natives’ constellation targets an animal rather than an artifici ...
... Figure 1 and 2 show two examples of stellar constellations created during the activity a member of the ‘Natives’ and ‘Explorers’ group, respectively. Already a clear impact of the cultural background of each group can be detected. The ‘Natives’ constellation targets an animal rather than an artifici ...
Determination of kinetic energies of stars using Hipparcos data *
... 3. The tangential velocities for each star were determined from the residual proper motions using equation (1). 4. The average tangential velocity is obtained for each spectral type. 5. The final step consists in calculating the average spatial velocity for each spectral type. It is known from Proba ...
... 3. The tangential velocities for each star were determined from the residual proper motions using equation (1). 4. The average tangential velocity is obtained for each spectral type. 5. The final step consists in calculating the average spatial velocity for each spectral type. It is known from Proba ...
The Sky This Month Apr May 2015
... be most easily seen and set at 10:25 pm. After that it will drop towards the Sunset, moving out of view after Mid-May. On April 22nd it approaches to within 1.25° north of Mars (observed with difficulty in a bright sky) and then pull away. On April 30th Mercury will pass within 2° of The Pleiades (a ...
... be most easily seen and set at 10:25 pm. After that it will drop towards the Sunset, moving out of view after Mid-May. On April 22nd it approaches to within 1.25° north of Mars (observed with difficulty in a bright sky) and then pull away. On April 30th Mercury will pass within 2° of The Pleiades (a ...
Making Heavier Metals
... The production of elements heavier than Iron takes place by adding neutrons to the atomic nuclei. These neutral particles do not feel any electrical repulsion from the charged nuclei. They can therefore easily approach them and thereby create heavier nuclei. This is indeed the way the heaviest chemi ...
... The production of elements heavier than Iron takes place by adding neutrons to the atomic nuclei. These neutral particles do not feel any electrical repulsion from the charged nuclei. They can therefore easily approach them and thereby create heavier nuclei. This is indeed the way the heaviest chemi ...
AST301.Ch6.15.SolarSystems - University of Texas Astronomy
... system by the intense stellar winds that are observed around all young stars. (See Fig. 15.4) But some solid particles were “left over,” since we now know of many “debris disks” around older stars. The whole process probably took 10 to100 million years, although this is wildly uncertain. The main th ...
... system by the intense stellar winds that are observed around all young stars. (See Fig. 15.4) But some solid particles were “left over,” since we now know of many “debris disks” around older stars. The whole process probably took 10 to100 million years, although this is wildly uncertain. The main th ...
Renaissance Astronomy
... west to east against the background of stars, each had a characteristic period when the motion was east to west. Copernicus reordered the planets from the fastest (Mercury) to the slowest (Saturn) and placed the Sun at the center of the solar system. The retrograde motion was easily explained by thi ...
... west to east against the background of stars, each had a characteristic period when the motion was east to west. Copernicus reordered the planets from the fastest (Mercury) to the slowest (Saturn) and placed the Sun at the center of the solar system. The retrograde motion was easily explained by thi ...
Chapter 14 The Milky Way Galaxy
... Unfortunately, he was not aware that most of the galaxy, particularly the center, is blocked from view by vast clouds of gas and dust. ...
... Unfortunately, he was not aware that most of the galaxy, particularly the center, is blocked from view by vast clouds of gas and dust. ...
Foundations of Harappan Astronomy:
... intellectual traditions therefore, they must have had an active astronomical tradition since astronomy and myths arise very early in civilisations and evolve with increasing complexity (Vahia and Yadav, ...
... intellectual traditions therefore, they must have had an active astronomical tradition since astronomy and myths arise very early in civilisations and evolve with increasing complexity (Vahia and Yadav, ...
A near IR adaptive optics search for faint companions to early
... We suspect that it is a highly reddened (J − K = 2.4) background star. In this region of sky there are other multiple systems with similar proper motions and radial velocities (e.g. HR 3283, 3322, 3359). Therefore, NO Pup belongs to an association. HD 108248/49/50 = α1,2 Cru. The coronographic image ...
... We suspect that it is a highly reddened (J − K = 2.4) background star. In this region of sky there are other multiple systems with similar proper motions and radial velocities (e.g. HR 3283, 3322, 3359). Therefore, NO Pup belongs to an association. HD 108248/49/50 = α1,2 Cru. The coronographic image ...
Dark Matter: Observational Constraints Properties of Dark Matter:
... • Hot, X-ray emitting gas is observed to be insufficient • Warm, 104 K ionized gas emits by bremstrahlung. If in hydrostatic equilibrium, central regions would be dense enough to be easily observed. • Molecular gas must be H2; large quantities would be ionized and observed near the galactic plane; i ...
... • Hot, X-ray emitting gas is observed to be insufficient • Warm, 104 K ionized gas emits by bremstrahlung. If in hydrostatic equilibrium, central regions would be dense enough to be easily observed. • Molecular gas must be H2; large quantities would be ionized and observed near the galactic plane; i ...
Comets and Asteroids Up-close
... largest object in the asteroid belt between Mars and Jupiter and the only dwarf planet located in the inner solar system. It was the first member of the asteroid belt to be discovered when Giuseppe Piazzi spotted it in 1801. ...
... largest object in the asteroid belt between Mars and Jupiter and the only dwarf planet located in the inner solar system. It was the first member of the asteroid belt to be discovered when Giuseppe Piazzi spotted it in 1801. ...
White dwarfs
... -Mass of Sirius B : M = 0.94 M⊙ (1910) -Temperature of Sirius B (“white”) : Teff = 8 000 K (Adams, 1914) It leads R = 18 000 km, ρ = 7 104 g/cm3 (Moderne values : Teff = 24 000 K , R = 2000 km , ρ = 6 107 g/cm3 ) - Eddington 1926 : “we have a star of a mass about equal to the sun and a radius much l ...
... -Mass of Sirius B : M = 0.94 M⊙ (1910) -Temperature of Sirius B (“white”) : Teff = 8 000 K (Adams, 1914) It leads R = 18 000 km, ρ = 7 104 g/cm3 (Moderne values : Teff = 24 000 K , R = 2000 km , ρ = 6 107 g/cm3 ) - Eddington 1926 : “we have a star of a mass about equal to the sun and a radius much l ...
M104: The Sombrero Galaxy
... Sombrero contains nearly 2,000 globular clusters —10 times as many as orbit our Milky Way. The ages of the clusters are similar to those in the Milky Way, ranging from 10 billion to 13 billion years old. The Sombrero is suspected of harboring a central black hole that is billions of times more massi ...
... Sombrero contains nearly 2,000 globular clusters —10 times as many as orbit our Milky Way. The ages of the clusters are similar to those in the Milky Way, ranging from 10 billion to 13 billion years old. The Sombrero is suspected of harboring a central black hole that is billions of times more massi ...
Astronomy Triemester Review Sheet 2015
... 6. What fuel source is used to power stars? What happens when that first source is used? 7. Describe how small and large stars move through their life cycles and die. Use the terms: red giant, planetary nebula, white dwarf, supergiant, super nova, neutron star, black hole, main sequence 8. What is t ...
... 6. What fuel source is used to power stars? What happens when that first source is used? 7. Describe how small and large stars move through their life cycles and die. Use the terms: red giant, planetary nebula, white dwarf, supergiant, super nova, neutron star, black hole, main sequence 8. What is t ...
Feb 2015 - Bays Mountain Park
... so a particular feature you are sketching or observing may not be visible very long if it is close to its western limb. Another bonus ...
... so a particular feature you are sketching or observing may not be visible very long if it is close to its western limb. Another bonus ...
“And God Said, Let There Be Lights in the Firmament of Heaven”
... were inhabited little was known about the nature of stars or the possibility of other planetary systems resembling our own although the universe was looked upon as friendly and nourishing to life we have since learned that life as we experience it could survive without external support in relatively ...
... were inhabited little was known about the nature of stars or the possibility of other planetary systems resembling our own although the universe was looked upon as friendly and nourishing to life we have since learned that life as we experience it could survive without external support in relatively ...
M104: The Sombrero Galaxy
... Sombrero contains nearly 2,000 globular clusters —10 times as many as orbit our Milky Way. The ages of the clusters are similar to those in the Milky Way, ranging from 10 billion to 13 billion years old. The Sombrero is suspected of harboring a central black hole that is billions of times more massi ...
... Sombrero contains nearly 2,000 globular clusters —10 times as many as orbit our Milky Way. The ages of the clusters are similar to those in the Milky Way, ranging from 10 billion to 13 billion years old. The Sombrero is suspected of harboring a central black hole that is billions of times more massi ...
EXOPLANET Due to increasing incursions by hostile alien forces
... ¹¹ Has approximately 5 billion years left in its life until it will become a red giant, expel its outer layers, and become a white dwarf. ¹¹ Second generation star. The previous star before our own sun went through a massive Super Nova at the end of its life, and sprinkled heavier elements into our ...
... ¹¹ Has approximately 5 billion years left in its life until it will become a red giant, expel its outer layers, and become a white dwarf. ¹¹ Second generation star. The previous star before our own sun went through a massive Super Nova at the end of its life, and sprinkled heavier elements into our ...
– 1 – 1. Chemical Evolution 1.1.
... suggests that the Salpeter IMF is too steep to fit the observations for low mass stars below 0.5M⊙ , and that a flatter slope is required, reaching −0.3 ± 0.7 for 0.01 < M/M⊙ < 0.08. Note that the transformation from luminosity to mass (the IMF is a function of stellar mass) is not as well determine ...
... suggests that the Salpeter IMF is too steep to fit the observations for low mass stars below 0.5M⊙ , and that a flatter slope is required, reaching −0.3 ± 0.7 for 0.01 < M/M⊙ < 0.08. Note that the transformation from luminosity to mass (the IMF is a function of stellar mass) is not as well determine ...
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.