Topic 4 - The University of Sheffield
... (1)! Gas - hot and cold gas, hydrogen and helium (2)! Snowballs - particles of frozen gas (3)! Dust - particles that include heavier elements like Si (4)! Rocks and Small Planets - including asteroid size objects (5)! Dim Stars - including Brown Dwarfs and Black Dwarfs (6)! Neutron Stars - remnants ...
... (1)! Gas - hot and cold gas, hydrogen and helium (2)! Snowballs - particles of frozen gas (3)! Dust - particles that include heavier elements like Si (4)! Rocks and Small Planets - including asteroid size objects (5)! Dim Stars - including Brown Dwarfs and Black Dwarfs (6)! Neutron Stars - remnants ...
the role of astronomical alignments in the rituals of the peak
... on the days of the summer and winter solstices, and the declination value of the third matches the Sun’s declination on the days of the spring and autumn equinoxes (Figure 7). In Table 1 the declinations of the three markers are compared with theoretical values of the Sun’s declinations at the solst ...
... on the days of the summer and winter solstices, and the declination value of the third matches the Sun’s declination on the days of the spring and autumn equinoxes (Figure 7). In Table 1 the declinations of the three markers are compared with theoretical values of the Sun’s declinations at the solst ...
The Stars - Springer
... Aurigae) is yellow, and Vega (a Lyrae) is steely blue. What causes stars to have such different colors, and why aren’t all the stars visibly multicolored? Well, stars can be classified into various groups, and these groups relate to the stars’ temperature, size and color. In fact, the classification ...
... Aurigae) is yellow, and Vega (a Lyrae) is steely blue. What causes stars to have such different colors, and why aren’t all the stars visibly multicolored? Well, stars can be classified into various groups, and these groups relate to the stars’ temperature, size and color. In fact, the classification ...
To Measure the Sky: An Introduction to Observational Astronomy.
... quite unremarkable at other wavelengths. The exact position for the X-ray source might be the only way to identify its optical or radio counterpart. Astronomers need to know where things are. Likewise, knowing when something happens is often as important as where it happens. The rhythms of the spinn ...
... quite unremarkable at other wavelengths. The exact position for the X-ray source might be the only way to identify its optical or radio counterpart. Astronomers need to know where things are. Likewise, knowing when something happens is often as important as where it happens. The rhythms of the spinn ...
ies la arboleda – centro tic - plurilingüe
... Telescopes are used to measure the light emitted by stars and to detect other celestial bodies. However, atmosphere produces distortion in the light coming from space, to avoid this fact we use Space-Based Telescopes and other instruments. Some tools used to collect information are shown in the pict ...
... Telescopes are used to measure the light emitted by stars and to detect other celestial bodies. However, atmosphere produces distortion in the light coming from space, to avoid this fact we use Space-Based Telescopes and other instruments. Some tools used to collect information are shown in the pict ...
View Diary of Astronomical Events - Astronomical Society of Singapore
... to tell the difference. ***August 12, 13 - Perseids Meteor Shower. The Perseids is one of the best meteor showers to observe, producing up to 60 meteors per hour at its peak. It is produced by comet Swift-Tuttle, which was discovered in 1862. The Perseids are famous for producing a large number of b ...
... to tell the difference. ***August 12, 13 - Perseids Meteor Shower. The Perseids is one of the best meteor showers to observe, producing up to 60 meteors per hour at its peak. It is produced by comet Swift-Tuttle, which was discovered in 1862. The Perseids are famous for producing a large number of b ...
The Next Great Exoplanet Hunt Please share
... the smaller the effects of shot noise and the higher the signalto-noise ratio. This in turn allows us to search for smaller exoplanets, which produce smaller transit signals. To put the smallness in perspective, an Earth-sized exoplanet transiting a Sunlike star produces a total dimming of only 84 p ...
... the smaller the effects of shot noise and the higher the signalto-noise ratio. This in turn allows us to search for smaller exoplanets, which produce smaller transit signals. To put the smallness in perspective, an Earth-sized exoplanet transiting a Sunlike star produces a total dimming of only 84 p ...
History of Astronomy
... sky at its farthest point from the Sun, the planet's angle on the sky away from the Sun, A, can be measured. You can see from the figure that at the same time angle B is 90°. The planet's distance from the Sun can then be calculated with geometry, if one knows the measured value of angle A and the f ...
... sky at its farthest point from the Sun, the planet's angle on the sky away from the Sun, A, can be measured. You can see from the figure that at the same time angle B is 90°. The planet's distance from the Sun can then be calculated with geometry, if one knows the measured value of angle A and the f ...
Lecture 12: Evolution of the Galaxy
... • The Galaxy is presumed to have started from a huge extended low density cloud of H and He • This underwent rapid gravitational collapse over ~2 × 108 years (halo era) during which time the Population II stars were formed, all with low metallicity • As collapse proceeded, gas and dust clouds formed ...
... • The Galaxy is presumed to have started from a huge extended low density cloud of H and He • This underwent rapid gravitational collapse over ~2 × 108 years (halo era) during which time the Population II stars were formed, all with low metallicity • As collapse proceeded, gas and dust clouds formed ...
November Celestial Calendar by Dave Mitsky All times are UT
... The peaks of the minor Southern and Northern Taurid meteor showers take place on November 5 and November 12 respectively. These streams form part of the complex associated with Comet 2P/Encke. The Full Moon severely compromises the peak of the Leonid meteor shower on the morning of November 17. Leo ...
... The peaks of the minor Southern and Northern Taurid meteor showers take place on November 5 and November 12 respectively. These streams form part of the complex associated with Comet 2P/Encke. The Full Moon severely compromises the peak of the Leonid meteor shower on the morning of November 17. Leo ...
Evidence for a signature of the galactic bar in the solar neighbourhood
... The global self-consistent 3-D numerical models of our Galaxy developed by Fux (1997) allow to interpret these observational features. These models have a bar axis ratio b/a = 0.5 ± 0.1 and a bar pattern speed Ωp = 50 ± 10 km s−1 corresponding to a corotation radius of 4.3 ± 0.5 kpc. The model m08 a ...
... The global self-consistent 3-D numerical models of our Galaxy developed by Fux (1997) allow to interpret these observational features. These models have a bar axis ratio b/a = 0.5 ± 0.1 and a bar pattern speed Ωp = 50 ± 10 km s−1 corresponding to a corotation radius of 4.3 ± 0.5 kpc. The model m08 a ...
Estudio de Cúmulos de Galaxias en el Sloan Digital Sky Survey
... – Building Galaxy Merger Trees. ...
... – Building Galaxy Merger Trees. ...
Chapter 10 Cycles and Patterns in Space D64 Lesson Preview
... You can often see the Moon shining in the night sky. But the Moon does not make its own light. The "moonlight" you see comes from sunlight reflecting, or bouncing, off the Moon's surface. This reflected light makes the side of the Moon that faces the Sun look bright. The side of the Moon that faces ...
... You can often see the Moon shining in the night sky. But the Moon does not make its own light. The "moonlight" you see comes from sunlight reflecting, or bouncing, off the Moon's surface. This reflected light makes the side of the Moon that faces the Sun look bright. The side of the Moon that faces ...
High-Mass Star Formation
... Initial characterization of n( r ) indicates a power law density structure of outer envelope CS J=5-4 traces dense gas properties associated with star formation CS J=7-6 + HCN & H13CN J=3-2 Mapping Survey (Texas Thesis projects of Jingwen Wu & Claudia Knez) Radiative transfer modeling of dense gas & ...
... Initial characterization of n( r ) indicates a power law density structure of outer envelope CS J=5-4 traces dense gas properties associated with star formation CS J=7-6 + HCN & H13CN J=3-2 Mapping Survey (Texas Thesis projects of Jingwen Wu & Claudia Knez) Radiative transfer modeling of dense gas & ...
sections 16-18 instructor notes
... v. by determining the peculiar velocity of the Sun relative to nearby galaxies in the Local Group. It is not as simple a task as it might seem, owing to the intrinsic velocities of other galaxies in the system. An estimate of the local circular velocity from such an analysis is that of Arp (A&A, 15 ...
... v. by determining the peculiar velocity of the Sun relative to nearby galaxies in the Local Group. It is not as simple a task as it might seem, owing to the intrinsic velocities of other galaxies in the system. An estimate of the local circular velocity from such an analysis is that of Arp (A&A, 15 ...
Galaxy alignment within dark matter halos
... However, due to the wrong color for central galaxies, the predicted alignment for centrals is wrong. If the color of central galaxies is defined by host halo mass in stead, the alignment prediction will fit with observational results. Metallicity is a better tracer for satellite alignment. G ...
... However, due to the wrong color for central galaxies, the predicted alignment for centrals is wrong. If the color of central galaxies is defined by host halo mass in stead, the alignment prediction will fit with observational results. Metallicity is a better tracer for satellite alignment. G ...
Larger, high-res file, best for printing
... shadow of another. That’s not what this event was. Technically, the May event was really a transit, the Moon being too small to completely cover the Sun (which would have been an occultation), and it thus passed across the face of another body, which is the definition of a transit. And as a transit, ...
... shadow of another. That’s not what this event was. Technically, the May event was really a transit, the Moon being too small to completely cover the Sun (which would have been an occultation), and it thus passed across the face of another body, which is the definition of a transit. And as a transit, ...
Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman
... tioned value. The LISM Kinematic Calculator1 predicts that the line of sight (LOS) toward TRAPPIST-1 crosses the Local Interstellar Cloud (LIC). Since the fit is mostly sensitive to the hydrogen column density in the cloud, we fixed its heliocentric radial velocity, temperature, and turbulent veloci ...
... tioned value. The LISM Kinematic Calculator1 predicts that the line of sight (LOS) toward TRAPPIST-1 crosses the Local Interstellar Cloud (LIC). Since the fit is mostly sensitive to the hydrogen column density in the cloud, we fixed its heliocentric radial velocity, temperature, and turbulent veloci ...
PH607lec12
... Hubble and collaborators began a systematic study of nearby galaxies which included measuring both their distance (Cepheids etc) and radial velocity. They soon noticed a remarkable trend: virtually all the galaxies they observed were moving away from our galaxy (redshifted) and the recession speed i ...
... Hubble and collaborators began a systematic study of nearby galaxies which included measuring both their distance (Cepheids etc) and radial velocity. They soon noticed a remarkable trend: virtually all the galaxies they observed were moving away from our galaxy (redshifted) and the recession speed i ...
Chapter 4 The Origin and Nature of Light
... So, the hotter star emits 8.8 times as much energy from each square meter of its surface than does the cooler star. Because the stars are the same size, the hotter one is therefore 8.8 times brighter than the cooler one. Try these questions: The color yellow is centered around 550 nm. If the Sun wer ...
... So, the hotter star emits 8.8 times as much energy from each square meter of its surface than does the cooler star. Because the stars are the same size, the hotter one is therefore 8.8 times brighter than the cooler one. Try these questions: The color yellow is centered around 550 nm. If the Sun wer ...
The Big Bang
... into a spiral galaxy (by conservation of angular momentum) • Disks of galaxies are very fragile; if they get hit with anything bigger than 10% of their own mass, they are destroyed (and don’t come back) • Collisions of galaxies in clusters was much more common in the past than at present ...
... into a spiral galaxy (by conservation of angular momentum) • Disks of galaxies are very fragile; if they get hit with anything bigger than 10% of their own mass, they are destroyed (and don’t come back) • Collisions of galaxies in clusters was much more common in the past than at present ...
1. The Birth of a Star
... 3. Would you like to see the Celestia 2? You can, by launching an external camera. To do so, click here once only (it is important to click only once) to activate the camera. The camera will take position off the starboard (right) side of your beautiful ship. She looks fast, doesn’t she? To get a be ...
... 3. Would you like to see the Celestia 2? You can, by launching an external camera. To do so, click here once only (it is important to click only once) to activate the camera. The camera will take position off the starboard (right) side of your beautiful ship. She looks fast, doesn’t she? To get a be ...
Lecture notes 18: Galaxies and galaxy clusters
... Immanuel Kant (1724–1824) and Thomas Wright (1711–1786) were among the first to recocnize the possibility that the Milky Way was indeed a stellar disk where the Sun was but one of many. Kant went on to propose that if the Milky Way were limited then perhaps the diffuse “elliptical nebulae” seen in the ...
... Immanuel Kant (1724–1824) and Thomas Wright (1711–1786) were among the first to recocnize the possibility that the Milky Way was indeed a stellar disk where the Sun was but one of many. Kant went on to propose that if the Milky Way were limited then perhaps the diffuse “elliptical nebulae” seen in the ...
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.