N5128PNSydney
... O is the most efficient coolant for the nebula < 15% of the stellar luminosity (1-2x104 L )סּis emitted in a single collisionally excited line O++ 1D2 – 3P2 [O III]5007Å This strong line allows detection of PN; high [O III]/Hα ratio discriminates against H I I regions Other lines of H, He, N, Ne, A ...
... O is the most efficient coolant for the nebula < 15% of the stellar luminosity (1-2x104 L )סּis emitted in a single collisionally excited line O++ 1D2 – 3P2 [O III]5007Å This strong line allows detection of PN; high [O III]/Hα ratio discriminates against H I I regions Other lines of H, He, N, Ne, A ...
Stellar Evolution II
... Larger clouds of gas (GMCs) tend to fragment into smaller ones before collapsing to form stars – very massive stars are rare • Stars with masses above 50 MSUN are unstable – nuclear reactions in their core produce energy at such a fast rate that they blow off their outer layers, losing mass. ...
... Larger clouds of gas (GMCs) tend to fragment into smaller ones before collapsing to form stars – very massive stars are rare • Stars with masses above 50 MSUN are unstable – nuclear reactions in their core produce energy at such a fast rate that they blow off their outer layers, losing mass. ...
7.4 Evolution on the Main-Sequence Main-sequence (m
... While the central parts of the star contract, the outer parts expand – the opposite behaviour of the core and envelope is a characteristic feature of stellar evolution. This is discussed in more detail below. The precise details of the evolution on the m-s, and in particular how it ends, depend stro ...
... While the central parts of the star contract, the outer parts expand – the opposite behaviour of the core and envelope is a characteristic feature of stellar evolution. This is discussed in more detail below. The precise details of the evolution on the m-s, and in particular how it ends, depend stro ...
MASS – LUMINOSITY RELATION FOR MASSIVE STARS
... It is remarkable that we obtained the mass luminosity relation without any reference to the stellar energy sources. This can be understood in the following terms. Within our approximation the opacity of matter is constant (per unit mass), the photons diffuse out at the rate they can, which is indep ...
... It is remarkable that we obtained the mass luminosity relation without any reference to the stellar energy sources. This can be understood in the following terms. Within our approximation the opacity of matter is constant (per unit mass), the photons diffuse out at the rate they can, which is indep ...
Lecture 11
... • “measure the positions of ~1 billion stars both in our Galaxy and other members of the Local Group, with an accuracy of 24 microarcseconds for stars to V = 15 and to 0.5 milliarcsec for stars to V = 20; • perform spectral and photometric measurements of ...
... • “measure the positions of ~1 billion stars both in our Galaxy and other members of the Local Group, with an accuracy of 24 microarcseconds for stars to V = 15 and to 0.5 milliarcsec for stars to V = 20; • perform spectral and photometric measurements of ...
Star formation jeopardy
... Inward force of gravity is equal to the outward force of radiation energy due to nuclear fusion ...
... Inward force of gravity is equal to the outward force of radiation energy due to nuclear fusion ...
Astro 10: Introductory Astronomy
... • 5. Freefall time for a solar system massed cloud is ~100,000 years, much too long to account for the CAI’s which cool within 20,000 years and all have uniform enrichment: Need fast, forceful compression, not freefall. • These observations indicated that Al-26 was injected rapidly, within 20,000 ye ...
... • 5. Freefall time for a solar system massed cloud is ~100,000 years, much too long to account for the CAI’s which cool within 20,000 years and all have uniform enrichment: Need fast, forceful compression, not freefall. • These observations indicated that Al-26 was injected rapidly, within 20,000 ye ...
Our Solar System
... that cannot, and between problems that can be solved by technology and those that cannot with regards to solar system formation. -Estimate quantities of distances in parsec. Estimate the age of the solar system. -Describe and apply classification systems and nomenclature used in the sciences. Classi ...
... that cannot, and between problems that can be solved by technology and those that cannot with regards to solar system formation. -Estimate quantities of distances in parsec. Estimate the age of the solar system. -Describe and apply classification systems and nomenclature used in the sciences. Classi ...
Be Stars
... B-type stars with understrength helium lines and strong hydrogen spectra. Other chemically strange B-types stars are mercury–manganese stars. Finally, there are Be stars that show a prominent emission spectrum of hydrogen this is because they have a rapid rate of rotation, with an equatorial rotatio ...
... B-type stars with understrength helium lines and strong hydrogen spectra. Other chemically strange B-types stars are mercury–manganese stars. Finally, there are Be stars that show a prominent emission spectrum of hydrogen this is because they have a rapid rate of rotation, with an equatorial rotatio ...
Stellar Parallax Problems
... B. The Milky Way galaxy has a diameter of about100,000 light years and we are about 28,000 light years from the center. In a sentence describe how much of the galaxy this hypothetical Gaia-copy mission could see (ignoring other factors like obscuration due to interstellar dust)? ...
... B. The Milky Way galaxy has a diameter of about100,000 light years and we are about 28,000 light years from the center. In a sentence describe how much of the galaxy this hypothetical Gaia-copy mission could see (ignoring other factors like obscuration due to interstellar dust)? ...
Part 2: Solar System Formation
... • Among these clouds the Hubble Space Telescope observed lumps and knots that appear to be new stars and planets being formed. ...
... • Among these clouds the Hubble Space Telescope observed lumps and knots that appear to be new stars and planets being formed. ...
Review Astronomy - Cowley`s Earth Systems
... and Newton’s work with gravity. Today, scientists are still gathering evidence that supports this hypothesis. What is the importance of Laplace’s work in the modern theory of solar system formation? a. Other scientists contradicted Laplace to provide support for their hypotheses. b. Laplace was help ...
... and Newton’s work with gravity. Today, scientists are still gathering evidence that supports this hypothesis. What is the importance of Laplace’s work in the modern theory of solar system formation? a. Other scientists contradicted Laplace to provide support for their hypotheses. b. Laplace was help ...
Hertzsprung-Russell Diagram
... At one end, the stars are big, hot and bright. Due to their color and size they are called blue giants, and the very largest are blue supergiants. At the other end they are small, cool and dim and are known as red dwarfs. The sun is right in the middle. ...
... At one end, the stars are big, hot and bright. Due to their color and size they are called blue giants, and the very largest are blue supergiants. At the other end they are small, cool and dim and are known as red dwarfs. The sun is right in the middle. ...
Thursday October 1 - Montana State University
... 1 AU If p = 1 arcsecond This distance is 1 parsec (3.26 light years) Unfortunately, there are no stars this close to us. ...
... 1 AU If p = 1 arcsecond This distance is 1 parsec (3.26 light years) Unfortunately, there are no stars this close to us. ...
Replace this sentence with the title of your abstract
... Preparing of the list of stars for the future observations The latest design of the telescope has an aperture of 10cm and it can detect about 25 stars brighter than stellar magnitude m = 11 with a sufficient signal to noise relation by 40 seconds of o integration. The field of view of the telescope ...
... Preparing of the list of stars for the future observations The latest design of the telescope has an aperture of 10cm and it can detect about 25 stars brighter than stellar magnitude m = 11 with a sufficient signal to noise relation by 40 seconds of o integration. The field of view of the telescope ...
Refuges for Life in a - University of Arizona
... has been a huge breakthrough: the discovery of giant, Jupitersize planets around sunlike stars. Not every sunlike star has such a planet. In fact, the giant planets discovered to date are primarily found around stars that are rich in chemical elements heavier than helium— what astronomers call “meta ...
... has been a huge breakthrough: the discovery of giant, Jupitersize planets around sunlike stars. Not every sunlike star has such a planet. In fact, the giant planets discovered to date are primarily found around stars that are rich in chemical elements heavier than helium— what astronomers call “meta ...
Chapter 18 Study Guide
... Red 8. What type of star has a high temperature but a low luminosity? (use H-R Diagram to determine) White dwarf 9. What type of star has a low temperature but a high luminosity? (use H-R Diagram to determine) Red supergiant 10. According to the Hertzsprung-Russell diagram, what relationship exist b ...
... Red 8. What type of star has a high temperature but a low luminosity? (use H-R Diagram to determine) White dwarf 9. What type of star has a low temperature but a high luminosity? (use H-R Diagram to determine) Red supergiant 10. According to the Hertzsprung-Russell diagram, what relationship exist b ...
Our Solar System
... (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite. ...
... (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite. ...
Untitled
... • The mass of 1 ½ Suns is packed into a ball that is as big as Manhattan. • One cm-cubed of neutron star material weighs as much as one whole mountain. ...
... • The mass of 1 ½ Suns is packed into a ball that is as big as Manhattan. • One cm-cubed of neutron star material weighs as much as one whole mountain. ...
No. 35 - Institute for Astronomy
... from Earth. Its detection is important because it “indicates that observational techniques are on the right track for finding habitable low-mass rocky planets similar to Earth,” according to Haghighipour. A planet is considered to be in the habitable zone if its temperature is just right for having ...
... from Earth. Its detection is important because it “indicates that observational techniques are on the right track for finding habitable low-mass rocky planets similar to Earth,” according to Haghighipour. A planet is considered to be in the habitable zone if its temperature is just right for having ...
(a) Because the core of heavy-mass star never reaches high enough
... (d) The mass of a star on the main sequence has nothing to do with its position in the Hertzsprung-Russell diagram. (e) Heavier main sequence stars have lower temperature than the lighter ones. Answer (a) 8. What do we need to measure in order to determine a star’s luminosity? (a) apparent brightnes ...
... (d) The mass of a star on the main sequence has nothing to do with its position in the Hertzsprung-Russell diagram. (e) Heavier main sequence stars have lower temperature than the lighter ones. Answer (a) 8. What do we need to measure in order to determine a star’s luminosity? (a) apparent brightnes ...
Stellar Evolution
... After the red giant phase, massive stars contract again allowing the core to become hot enough to fuse heavier and heavier elements until they reach iron. When this occurs the star doesn’t have enough energy to further fuse iron so gravity quickly crushes the star, causing the protons and electrons ...
... After the red giant phase, massive stars contract again allowing the core to become hot enough to fuse heavier and heavier elements until they reach iron. When this occurs the star doesn’t have enough energy to further fuse iron so gravity quickly crushes the star, causing the protons and electrons ...
File
... As time goes by, the water evaporates very slowly from the solution , so sugar molecules continue to come out of the remaining solution and move onto the seed crystals on the string. Sugar molecules have a particular shape; they don't, for example, look like snow or diamond crystals. After millions ...
... As time goes by, the water evaporates very slowly from the solution , so sugar molecules continue to come out of the remaining solution and move onto the seed crystals on the string. Sugar molecules have a particular shape; they don't, for example, look like snow or diamond crystals. After millions ...