Why Study Cosmic Near Infrared Background? (1-4um)
... Did these early stars that are responsible for the near infrared background overenrich the metals in the universe too early? ...
... Did these early stars that are responsible for the near infrared background overenrich the metals in the universe too early? ...
SMMP_BISANA - Infinity and Beyond
... the point at which it glows brightly. These narrowly-focused jets can be trillions of miles long and can travel at 500,000 miles per hour. These jets may be focused by the star's magnetic field. The protostar is now a stable main sequence star which will remain in this state for about 10 billion yea ...
... the point at which it glows brightly. These narrowly-focused jets can be trillions of miles long and can travel at 500,000 miles per hour. These jets may be focused by the star's magnetic field. The protostar is now a stable main sequence star which will remain in this state for about 10 billion yea ...
Gravitational Waves – detectors, sources & science
... • Many have been detected with radio telescopes, e.g., Crab Pulsar. Wide range of rotation frequencies – ~1 Hz –> 1 kHz. • The surface of a neutron star may be bumpy, e.g., from fluid motions or crustal deformation. • Rapid rotation ensures such “mountainous” neutron stars emit GWs at twice the rota ...
... • Many have been detected with radio telescopes, e.g., Crab Pulsar. Wide range of rotation frequencies – ~1 Hz –> 1 kHz. • The surface of a neutron star may be bumpy, e.g., from fluid motions or crustal deformation. • Rapid rotation ensures such “mountainous” neutron stars emit GWs at twice the rota ...
HighRedshiftGalaxies
... In addition to the scatter arising from extinction (accounted for via individual Balmer emission line decrements), somebody suggests that some fraction of their UV-selected population must be suffering star formation which is erratic in its time history. In such a situation, different diagnostics wi ...
... In addition to the scatter arising from extinction (accounted for via individual Balmer emission line decrements), somebody suggests that some fraction of their UV-selected population must be suffering star formation which is erratic in its time history. In such a situation, different diagnostics wi ...
The Zodiac - Alchemical.org
... constellations associated with water, the Water Goat, the Water Bearer, and the Fishes. The ancient Babylonians saw the constellation as representing Ea, the fish-god who they also associated with an antelope. Earlier, the Sumerians had seen these stars as Enki, their river god. He was the ruler of ...
... constellations associated with water, the Water Goat, the Water Bearer, and the Fishes. The ancient Babylonians saw the constellation as representing Ea, the fish-god who they also associated with an antelope. Earlier, the Sumerians had seen these stars as Enki, their river god. He was the ruler of ...
1 - ESO
... From old IRAS data, we identified two solar-mass, adolescent stars -- a Pleiad and a field star (age >~few 100 Myr); Follow-up at Keck and at Gemini revealed a huge tau (4%) and evidence for micronsize crystalline and amorphous silicate particles. ...
... From old IRAS data, we identified two solar-mass, adolescent stars -- a Pleiad and a field star (age >~few 100 Myr); Follow-up at Keck and at Gemini revealed a huge tau (4%) and evidence for micronsize crystalline and amorphous silicate particles. ...
Making Heavier Metals
... particular way. At the same time, they produce beautiful nebulae like the "Dumbbell Nebula". Our Sun will also end its active life this way, probably some 7 billion years from now. Low-metallicity stars The detailed understanding of the "s-process" and, in particular, where it takes place inside an ...
... particular way. At the same time, they produce beautiful nebulae like the "Dumbbell Nebula". Our Sun will also end its active life this way, probably some 7 billion years from now. Low-metallicity stars The detailed understanding of the "s-process" and, in particular, where it takes place inside an ...
Document
... stable part of their life cycle. White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen without a telescope. Can you locate blue giants on the H-R diagram? ...
... stable part of their life cycle. White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen without a telescope. Can you locate blue giants on the H-R diagram? ...
mass loss of massive stars - of /proceedings
... takes up to 5% of the star’s lifetime. Typically, a 40 M star will spend 0.2 Myr as a WR for a total lifetime of 5 Myr. During that phase, Wolf-Rayet stars have strong stellar winds characterized by mass loss rates of 10−6 to 10−4 M yr−1 and velocities of 800 to 2500 km s−1 . The wind density is t ...
... takes up to 5% of the star’s lifetime. Typically, a 40 M star will spend 0.2 Myr as a WR for a total lifetime of 5 Myr. During that phase, Wolf-Rayet stars have strong stellar winds characterized by mass loss rates of 10−6 to 10−4 M yr−1 and velocities of 800 to 2500 km s−1 . The wind density is t ...
Is there life in space? Activity 2: Moving Stars and Their Planets
... Q. Most of the planets that have been discovered orbit their stars at a tilt closer to 0 degrees than to 90 degrees. Why? A. The signal is more evident when the tilt is lower. The telescopes are not perfect, so they can only detect star motions that are very large. The largest motions occur when the ...
... Q. Most of the planets that have been discovered orbit their stars at a tilt closer to 0 degrees than to 90 degrees. Why? A. The signal is more evident when the tilt is lower. The telescopes are not perfect, so they can only detect star motions that are very large. The largest motions occur when the ...
The Bigger Picture
... Stellar Luminosity • When we learn how to get distances beyond the limits of parallax and sample many more stars, we will find there are stars that are stars that are 106 times the luminosity of the Sun. • This is an enormous range in energy output from stars. This is an important clue in figuring ...
... Stellar Luminosity • When we learn how to get distances beyond the limits of parallax and sample many more stars, we will find there are stars that are stars that are 106 times the luminosity of the Sun. • This is an enormous range in energy output from stars. This is an important clue in figuring ...
Simple models for SNC stars - University of Hawaii Physics and
... Summary The simple nonlinear models suggest the importance of considering simple explanations 0: The golden ratio itself has unique and remarkable properties; as the irrational number least well approximated by rational numbers, it is the least “resonant” number 1: A finite network model of identic ...
... Summary The simple nonlinear models suggest the importance of considering simple explanations 0: The golden ratio itself has unique and remarkable properties; as the irrational number least well approximated by rational numbers, it is the least “resonant” number 1: A finite network model of identic ...
Celestial Objects
... Rarity of Eclipses 37 – Eclipses are rare because the Moon’s orbit around the Earth is tilted with respect to the Earth’s orbit around the Sun. Without the tilt, we would have solar and lunar eclipses every month. However, with the tilt, the result is that at new moon, the Moon’s shadow generally fa ...
... Rarity of Eclipses 37 – Eclipses are rare because the Moon’s orbit around the Earth is tilted with respect to the Earth’s orbit around the Sun. Without the tilt, we would have solar and lunar eclipses every month. However, with the tilt, the result is that at new moon, the Moon’s shadow generally fa ...
Groups of Stars
... generally not close to one another. Lie in the same general direction of the sky as seen from Earth. ...
... generally not close to one another. Lie in the same general direction of the sky as seen from Earth. ...
The Milky Way Galaxy
... • If we know the magnitudes, we can determine distances: D = 10(Mapp - Mabs +5)/5 • You can also read the distance off the graph! ...
... • If we know the magnitudes, we can determine distances: D = 10(Mapp - Mabs +5)/5 • You can also read the distance off the graph! ...
Brown Dwarfs and M Dwarfs
... failure and its many consequences” • Low mass “objects” do not have stable thermonuclear reactions to heat their cores and halt the gravitational contraction → rapid rotation and degenerate convective cores → secular cooling of the atmosphere. • Cool atmospheres have very low ionization → decoupling ...
... failure and its many consequences” • Low mass “objects” do not have stable thermonuclear reactions to heat their cores and halt the gravitational contraction → rapid rotation and degenerate convective cores → secular cooling of the atmosphere. • Cool atmospheres have very low ionization → decoupling ...
xam2ans
... in the core of a main sequence star like the Sun? Answer: The rest mass energy of a neutron is larger than a proton plus electron. Consequently this reaction is endothermic, which means energetically unfavorable. (d) On the other hand, p+ + e → n + e does occur in a neutron star or a sufficiently ...
... in the core of a main sequence star like the Sun? Answer: The rest mass energy of a neutron is larger than a proton plus electron. Consequently this reaction is endothermic, which means energetically unfavorable. (d) On the other hand, p+ + e → n + e does occur in a neutron star or a sufficiently ...
Solutions to Homework #4, AST 203, Spring 2009
... and the host star will not affect the answer. The difference is just the cross sectional area of the planet. Jupiter’s radius is 11 times the Earth radius, so the answer in b) will increase by 112 ∼ 100. So, the answer is 1% change in brightness. This change can be detected even with the Earth-based ...
... and the host star will not affect the answer. The difference is just the cross sectional area of the planet. Jupiter’s radius is 11 times the Earth radius, so the answer in b) will increase by 112 ∼ 100. So, the answer is 1% change in brightness. This change can be detected even with the Earth-based ...
The 22 First Magnitude Stars
... Proper Names • Different in different languages • English names generally based on Greek, Latin, Arabic • Only the brightest stars have proper names in common use • Multiple stars have suffix A, B, C, etc. applied to components in order of apparent brightness ...
... Proper Names • Different in different languages • English names generally based on Greek, Latin, Arabic • Only the brightest stars have proper names in common use • Multiple stars have suffix A, B, C, etc. applied to components in order of apparent brightness ...