Tom Maccarone (Texas Tech University)
... Our optical spectrum shows strong [O III] lines, but no Balmer emission Most obvious way to reconcile these points is with a white dwarf donor star (Gnedin et al. 2009) May require a triple star for formation (Ivanova et al. 2009) This could then lead to eccentricity cycles which could modulate the ...
... Our optical spectrum shows strong [O III] lines, but no Balmer emission Most obvious way to reconcile these points is with a white dwarf donor star (Gnedin et al. 2009) May require a triple star for formation (Ivanova et al. 2009) This could then lead to eccentricity cycles which could modulate the ...
Homework 4
... 1. If a protostar is forming out of a cold molecular cloud, how can its luminosity be upto one hundred times as large as the luminosity of the star it will become? ...
... 1. If a protostar is forming out of a cold molecular cloud, how can its luminosity be upto one hundred times as large as the luminosity of the star it will become? ...
Space Unit Exam /31
... a. ____ In the beginning, before the ‘big bang’, the universe was very small, dense and cold. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ b. ____ The li ...
... a. ____ In the beginning, before the ‘big bang’, the universe was very small, dense and cold. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ b. ____ The li ...
16.6 NOTES How do astronomers measure distance? Objective
... Objective: Identify two methods astronomers use to measure distances in space ...
... Objective: Identify two methods astronomers use to measure distances in space ...
What`s in the sky tonight - Forsyth Astronomical Society
... Asteroid bombardment over billions of years has left the lunar surface pockmarked with craters of all sizes, and covered with solidified lava, rubble, and dust. Glimpses of the original surface, or crust, are rare, and views into the deep crust are rarer still. Fortunately, a crater on the edge of t ...
... Asteroid bombardment over billions of years has left the lunar surface pockmarked with craters of all sizes, and covered with solidified lava, rubble, and dust. Glimpses of the original surface, or crust, are rare, and views into the deep crust are rarer still. Fortunately, a crater on the edge of t ...
Lecture 5: Matter Dominated Universe: CMB Anisotropies and Large
... Sachs-Wolfe (ΔT/T ~ -Δρ/ρ), Doppler (ΔT/T ~ V/c) and Sunyaev-Zeldovich (Re-ionisation) effects. • From the CMB Power Spectrum, most cosmological parameters are determined to a few percent. This determines the redshifttime relationship, R( t ) = 1 + z( t ) . • Supercomputer simulations, with initia ...
... Sachs-Wolfe (ΔT/T ~ -Δρ/ρ), Doppler (ΔT/T ~ V/c) and Sunyaev-Zeldovich (Re-ionisation) effects. • From the CMB Power Spectrum, most cosmological parameters are determined to a few percent. This determines the redshifttime relationship, R( t ) = 1 + z( t ) . • Supercomputer simulations, with initia ...
The Great Bear and the Little Bear
... • They are much larger than planets and much further from Earth. • The sun is the closest star to Earth. • Most of the gas in the inside of a star is hydrogen and its temperature is over 20 million degrees Fahrenheit. There is also helium, a gas that is formed when the hydrogen molecules join togeth ...
... • They are much larger than planets and much further from Earth. • The sun is the closest star to Earth. • Most of the gas in the inside of a star is hydrogen and its temperature is over 20 million degrees Fahrenheit. There is also helium, a gas that is formed when the hydrogen molecules join togeth ...
The Satellites of Uranus and Neptune: A New Astrometrie Programme
... The X-ray Cluster of Galaxies Klemola 44 On October 17, 1977, three astronomers sat together at lunch on La Silla. One, Dr. Massimo Tarenghi-newcomer to the Scientific Group in Geneva-had just returned from the Interamerican Observatory on Gerro Tolo10. Another, Dr. Anthony G. Danks, recently joined ...
... The X-ray Cluster of Galaxies Klemola 44 On October 17, 1977, three astronomers sat together at lunch on La Silla. One, Dr. Massimo Tarenghi-newcomer to the Scientific Group in Geneva-had just returned from the Interamerican Observatory on Gerro Tolo10. Another, Dr. Anthony G. Danks, recently joined ...
Solution to Problem Set 1 1. The total number of nucleons in one
... naked eye, 6 = 4.7 + 5 log 10 pc , which gives d = 18.2 pc. The flux is then f = L/(4πd2 ) = 9.6 × 10−11 W m−2 . Assuming the area of the eyes is about A = 1 cm2 , then the total energy received in a time period of t = 1s is E = f At = 9.6 × 10−15 J. The photons are mostly in the visible range, so h ...
... naked eye, 6 = 4.7 + 5 log 10 pc , which gives d = 18.2 pc. The flux is then f = L/(4πd2 ) = 9.6 × 10−11 W m−2 . Assuming the area of the eyes is about A = 1 cm2 , then the total energy received in a time period of t = 1s is E = f At = 9.6 × 10−15 J. The photons are mostly in the visible range, so h ...
Unit 1 The Universe
... atmosphere expanding after active fusion ends. – Planetary nebula -forms when a star can no longer support itself by fusion reactions in its center – White dwarf -hot, dense core of matter that remains from the collapse of a low-mass star. It is about the size of Earth. – Black dwarf-white dwarf tha ...
... atmosphere expanding after active fusion ends. – Planetary nebula -forms when a star can no longer support itself by fusion reactions in its center – White dwarf -hot, dense core of matter that remains from the collapse of a low-mass star. It is about the size of Earth. – Black dwarf-white dwarf tha ...
November 2008 - Otterbein University
... • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
... • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
Chapter 13
... The End of a Star’s Life When all the nuclear fuel in a star is used up, gravity will win over pressure and the star will die. ...
... The End of a Star’s Life When all the nuclear fuel in a star is used up, gravity will win over pressure and the star will die. ...
The Transient Radio Sky Astrophysical and Artificial
... Experiment: Imaging 3D ‘tomography’ of IGM in HI 21cm line ...
... Experiment: Imaging 3D ‘tomography’ of IGM in HI 21cm line ...
SUMMARY OF KEY CONCEPTS: GALAXIES AND COSMOLOGY
... This analysis is easiest to apply to spiral galaxies, which have a well-organized rotation of the stars and gas about the center. In most cases, the resulting rotation curve (velocity as a function of radius) is found to be flat at large radius. This is an important observation. It implies that ther ...
... This analysis is easiest to apply to spiral galaxies, which have a well-organized rotation of the stars and gas about the center. In most cases, the resulting rotation curve (velocity as a function of radius) is found to be flat at large radius. This is an important observation. It implies that ther ...
The Universe
... of space where matter has collapsed in on itself. This catastrophic collapse results in a huge amount of mass being concentrated in an incredibly small area. The gravitational pull of this region is so great that nothing can escape – not even light. Although black holes cannot be seen, we know they ...
... of space where matter has collapsed in on itself. This catastrophic collapse results in a huge amount of mass being concentrated in an incredibly small area. The gravitational pull of this region is so great that nothing can escape – not even light. Although black holes cannot be seen, we know they ...
Stellar Evolution
... Radii: R ~ 0.2 - 3 light years Expanding at ~10 – 20 km/s (← Doppler shifts) Less than 10,000 years old ...
... Radii: R ~ 0.2 - 3 light years Expanding at ~10 – 20 km/s (← Doppler shifts) Less than 10,000 years old ...
Light is a
... Heat, electricity, or light can move the electron up to different energy levels. The electron is now said to be “________________” As the electron falls back to the ground state, it gives the energy back as ________________ They may fall down in specific steps Each step has a different energy ...
... Heat, electricity, or light can move the electron up to different energy levels. The electron is now said to be “________________” As the electron falls back to the ground state, it gives the energy back as ________________ They may fall down in specific steps Each step has a different energy ...
Astronomy and Humanism by Ray Thompson A. EARLY
... significant was the fact that Cepheid variables could often be seen in distant galaxies. For the first time galactic distances could be obtained and it became clear just how enormous the universe was! This brings us to Edwin Hubble of Mount Wilson Observatory who concentrated on determining the dist ...
... significant was the fact that Cepheid variables could often be seen in distant galaxies. For the first time galactic distances could be obtained and it became clear just how enormous the universe was! This brings us to Edwin Hubble of Mount Wilson Observatory who concentrated on determining the dist ...
AN INTRODUCTION TO ASTRONOMY Dr. Uri Griv •
... Explanation: How could a galaxy become shaped like a ring? The rim of the blue galaxy pictured on the right is an immense ring-like structure 150,000 light years in diameter composed of newly formed, extremely bright, massive stars. That galaxy, AM 0644-741, is known as a ring galaxy and was caused ...
... Explanation: How could a galaxy become shaped like a ring? The rim of the blue galaxy pictured on the right is an immense ring-like structure 150,000 light years in diameter composed of newly formed, extremely bright, massive stars. That galaxy, AM 0644-741, is known as a ring galaxy and was caused ...
www.astro.caltech.edu
... New Classes of Burst While the majority of detected GRBs originate from massive stars, a smaller subset sees to have a completely different physical cause (Figure 2). The host galaxies of short-duration GRBs (those whose gamma-ray emission lasts for 2 seconds or less) observed with Keck have been lo ...
... New Classes of Burst While the majority of detected GRBs originate from massive stars, a smaller subset sees to have a completely different physical cause (Figure 2). The host galaxies of short-duration GRBs (those whose gamma-ray emission lasts for 2 seconds or less) observed with Keck have been lo ...
Stars and Moon Summative Review
... Identify the phases of the moon. How does the gravitational pull of the moon affect the Earth? (the side closest and the side farthest) What does a waxing moon indicate? Identify the cause of tides on Earth. Describe the effect that the elliptical orbit of the moon has on the Earth. ...
... Identify the phases of the moon. How does the gravitational pull of the moon affect the Earth? (the side closest and the side farthest) What does a waxing moon indicate? Identify the cause of tides on Earth. Describe the effect that the elliptical orbit of the moon has on the Earth. ...
Higher Physics Content Statements
... or away from a stationary observer should be investigated. The Doppler Effect causes similar shifts in wavelengths of light. The light from objects moving away from us is shifted to longer wavelengths – redshift. The redshift of a galaxy is the change in wavelength divided by the emitted wavelength. ...
... or away from a stationary observer should be investigated. The Doppler Effect causes similar shifts in wavelengths of light. The light from objects moving away from us is shifted to longer wavelengths – redshift. The redshift of a galaxy is the change in wavelength divided by the emitted wavelength. ...
Red Giants and White Dwarfs
... • This heat allows fusion to occur in a shell of material surrounding the core… • Due to the higher central temperature, the star’s luminosity is greater than before… • This increased energy production causes the outer part of the star to expand and cool (counterintuitive!)… • We now have a very lar ...
... • This heat allows fusion to occur in a shell of material surrounding the core… • Due to the higher central temperature, the star’s luminosity is greater than before… • This increased energy production causes the outer part of the star to expand and cool (counterintuitive!)… • We now have a very lar ...
**** 1 - Asiaa
... constant with time, we can adopt the Local bulgeblack hole mass relation to high-z Universe. 2. At z > 10, quasar density is expected to decrease significantly, and GRBs are good candidate radio ...
... constant with time, we can adopt the Local bulgeblack hole mass relation to high-z Universe. 2. At z > 10, quasar density is expected to decrease significantly, and GRBs are good candidate radio ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.