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Lecture 1 - SUNY Oswego
... Lyraes. Very regular brightness fluctuations ranging from hours to days. ...
... Lyraes. Very regular brightness fluctuations ranging from hours to days. ...
Chapter 11. Stellar Brightness, Magnitudes, the Distance
... of previous main sequence stars after they have gone through the red giant phase. They are extremely hot only because they were once the core of the star and have not yet cooled off substantially. We will discuss them in greater detail later. They are very small, with radii approximately equal to th ...
... of previous main sequence stars after they have gone through the red giant phase. They are extremely hot only because they were once the core of the star and have not yet cooled off substantially. We will discuss them in greater detail later. They are very small, with radii approximately equal to th ...
5. Star Formation and the Interstellar Medium in the Milky Way
... interstellar chemistry. Nonetheless, the great bulk of the relevant data come from heterodyne observations of rotational spectra at mm and sub-mm wavelengths. The high sensitivity, angular resolution, and mapping speed of the LMT will enable detailed investigations of the chemistry of interstellar m ...
... interstellar chemistry. Nonetheless, the great bulk of the relevant data come from heterodyne observations of rotational spectra at mm and sub-mm wavelengths. The high sensitivity, angular resolution, and mapping speed of the LMT will enable detailed investigations of the chemistry of interstellar m ...
Basics about stars
... shell with a growing helium core till helium ignites. • horizontal branch: ejection of parts of the envelope, helium burning in the core and hydrogen burning in a shell. • Post-asymptotic branch: Final evolution to the white dwarf. • White dwarf: Electron degeneracy pressure is responsible for maint ...
... shell with a growing helium core till helium ignites. • horizontal branch: ejection of parts of the envelope, helium burning in the core and hydrogen burning in a shell. • Post-asymptotic branch: Final evolution to the white dwarf. • White dwarf: Electron degeneracy pressure is responsible for maint ...
Microsoft Word - LifeCycleInteractive
... 21. Why does the outer shell of the star expand? 22. As the outer shell of the star expands, the surface temperature of the star decreases. Helium burning is much hotter than hydrogen burning. Why would the surface temperature decrease? Close quiz window. 23. The red giant is the first step in _____ ...
... 21. Why does the outer shell of the star expand? 22. As the outer shell of the star expands, the surface temperature of the star decreases. Helium burning is much hotter than hydrogen burning. Why would the surface temperature decrease? Close quiz window. 23. The red giant is the first step in _____ ...
The Milky Way - Chandra X
... other spiral arms of the Galaxy come into view along with the central bulge, where the Galaxy's supermassive black hole is located. Finally, from a distance of a few million light years, we see the Galaxy as part of the Local Group. From the tranquil, wide-open spaces between the galaxies of the Loc ...
... other spiral arms of the Galaxy come into view along with the central bulge, where the Galaxy's supermassive black hole is located. Finally, from a distance of a few million light years, we see the Galaxy as part of the Local Group. From the tranquil, wide-open spaces between the galaxies of the Loc ...
The Milky Way - Chandra X
... other spiral arms of the Galaxy come into view along with the central bulge, where the Galaxy's supermassive black hole is located. Finally, from a distance of a few million light years, we see the Galaxy as part of the Local Group. From the tranquil, wide-open spaces between the galaxies of the Loc ...
... other spiral arms of the Galaxy come into view along with the central bulge, where the Galaxy's supermassive black hole is located. Finally, from a distance of a few million light years, we see the Galaxy as part of the Local Group. From the tranquil, wide-open spaces between the galaxies of the Loc ...
External Occulters for the Direct Study of Exoplanets
... studies have showed that a baseline heliocentric orbit requires considerably less propellant mass but longer re-targeting travel times than a baseline L2 orbit. Analysis of a 50,000 km occulter separation distance in an Earth-trailing or Earth-leading orbit found station-keeping requirements to be ~ ...
... studies have showed that a baseline heliocentric orbit requires considerably less propellant mass but longer re-targeting travel times than a baseline L2 orbit. Analysis of a 50,000 km occulter separation distance in an Earth-trailing or Earth-leading orbit found station-keeping requirements to be ~ ...
Solution key
... ___A___12. A particle of mass m falls from a large distance onto a black hole of mass M. The amount of gravitational energy released is A. mc2/2 B. mc2 C. Mc2/2 D. Mc2 E. Cannot be determined from the information given ___A___13. Which of the following optical filters would make the central star st ...
... ___A___12. A particle of mass m falls from a large distance onto a black hole of mass M. The amount of gravitational energy released is A. mc2/2 B. mc2 C. Mc2/2 D. Mc2 E. Cannot be determined from the information given ___A___13. Which of the following optical filters would make the central star st ...
Gravitational Waves from Neutron Stars
... We study how the frequencies and damping times of the QNMs change for 0.2 s < t < 50 s after the bounce the star is composed of • low entropy, lepton rich core with trapped υs • high entropy, low density, accreting mantle • after Sn explosion, in a few tens of seconds extensive neutrino losses reduc ...
... We study how the frequencies and damping times of the QNMs change for 0.2 s < t < 50 s after the bounce the star is composed of • low entropy, lepton rich core with trapped υs • high entropy, low density, accreting mantle • after Sn explosion, in a few tens of seconds extensive neutrino losses reduc ...
Current Challenges Facing Planet Transit Surveys
... method: Ground-based photometry was likely to succeed only for gas-giant planets, yet such planets were expected only at large distances. Even if all Sun-like stars had a Jupiter, transiting systems would be rare (only 1 in 1000 systems would have the inclination to transit), and, worse yet, the tra ...
... method: Ground-based photometry was likely to succeed only for gas-giant planets, yet such planets were expected only at large distances. Even if all Sun-like stars had a Jupiter, transiting systems would be rare (only 1 in 1000 systems would have the inclination to transit), and, worse yet, the tra ...
Article 8
... has no meaning, because spacetime itself is a property of the universe. According to the Big Bang theory, the universe began about twelve to fifteen billion years ago in a violent explosion. For an incomprehensibly small fraction of a second, the universe was an infinitely dense and infinitely hot f ...
... has no meaning, because spacetime itself is a property of the universe. According to the Big Bang theory, the universe began about twelve to fifteen billion years ago in a violent explosion. For an incomprehensibly small fraction of a second, the universe was an infinitely dense and infinitely hot f ...
The GAPS Programme with HARPS-N@ TNG II: No giant planets
... instruments’ pipelines, as well as with the Ca II H&K activity indicator, measured as in Desidera et al. (2006). S12 also suggest that HIP 11952 could be a pulsating variable. This possibility would be of great relevance, since in this case the RV measurements should primarily show the effect of the ...
... instruments’ pipelines, as well as with the Ca II H&K activity indicator, measured as in Desidera et al. (2006). S12 also suggest that HIP 11952 could be a pulsating variable. This possibility would be of great relevance, since in this case the RV measurements should primarily show the effect of the ...
sun.galaxy.notes
... But what determines the size of a star? Gravity wants to crush the star So why doesn’t it? Because the outward pressure Or force of energy from Fusion balances out the inward force of gravity This keeps the star in a state of balance or equilibrium! ...
... But what determines the size of a star? Gravity wants to crush the star So why doesn’t it? Because the outward pressure Or force of energy from Fusion balances out the inward force of gravity This keeps the star in a state of balance or equilibrium! ...
JCMT Sciences on Debris Disks and other brief
... Observations of Nearby Stars” survey was to greatly increase the number of imaged disks at submm wavelengths ...
... Observations of Nearby Stars” survey was to greatly increase the number of imaged disks at submm wavelengths ...
From the Big Bang to the Nobel Prize: Cosmic Background Explorer
... Astronomical Search For Origins ...
... Astronomical Search For Origins ...
Astronomy
... 1. Early astronomers identified celestial objects with _________ and ___________. 2. List five phenomena that early astronomers linked to celestial changes. ...
... 1. Early astronomers identified celestial objects with _________ and ___________. 2. List five phenomena that early astronomers linked to celestial changes. ...
The Death of a Star - hrsbstaff.ednet.ns.ca
... The first hints of the existence of dark matter came from an analysis of the line-of-sight velocities of galaxies in the Coma cluster, by Fritz Zwicky, in the early 1930s. Zwicky found that the galaxies are moving much too fast for them to be held together in a cluster, by gravity, if the only mass ...
... The first hints of the existence of dark matter came from an analysis of the line-of-sight velocities of galaxies in the Coma cluster, by Fritz Zwicky, in the early 1930s. Zwicky found that the galaxies are moving much too fast for them to be held together in a cluster, by gravity, if the only mass ...
Untitled
... cycle has been running for billions of years, aJnd,because the universe is still composed mostly of starting ingredients (98%), it will run for billions more. AUldwhat of our own neighborhood, our sun and solar system? The sun is probably a second- or third-generation star; its parent, a nearby supe ...
... cycle has been running for billions of years, aJnd,because the universe is still composed mostly of starting ingredients (98%), it will run for billions more. AUldwhat of our own neighborhood, our sun and solar system? The sun is probably a second- or third-generation star; its parent, a nearby supe ...
Lecture 12- Stars: Distances and Magnitudes
... tell us about the nature of stars? This is a real question. I want some answers. ...
... tell us about the nature of stars? This is a real question. I want some answers. ...
script
... giants (full line), P-H dwarfs with periods larger than 180 days (dashed line) and all P-H dwarfs (dotted). The giants show a distribution shifted to lower metallicity by about 0.2-0.3 dex with respect to the dwarfs ...
... giants (full line), P-H dwarfs with periods larger than 180 days (dashed line) and all P-H dwarfs (dotted). The giants show a distribution shifted to lower metallicity by about 0.2-0.3 dex with respect to the dwarfs ...
ppt
... Looking into a star at any angle, we always look back to an optical depth of about t l = 2/3 as measured straight back along the line of sight Photon’s at a distance of less than 1 mean free path from the surface are likely to escape Star’s photosphere is defined to be the layer from which visible l ...
... Looking into a star at any angle, we always look back to an optical depth of about t l = 2/3 as measured straight back along the line of sight Photon’s at a distance of less than 1 mean free path from the surface are likely to escape Star’s photosphere is defined to be the layer from which visible l ...
22. The Milky Way Galaxy
... and computer simulations show this situation can be maintained for a long time. ...
... and computer simulations show this situation can be maintained for a long time. ...
Planetary nebula
![](https://commons.wikimedia.org/wiki/Special:FilePath/NGC6543.jpg?width=300)
A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars late in their lives. The word ""nebula"" is Latin for mist or cloud and the term ""planetary nebula"" is a misnomer that originated in the 1780s with astronomer William Herschel because when viewed through his telescope, these objects appeared to him to resemble the rounded shapes of planets. Herschel's name for these objects was popularly adopted and has not been changed. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years.A mechanism for formation of most planetary nebulae is thought to be the following: at the end of the star's life, during the red giant phase, the outer layers of the star are expelled by strong stellar winds. Eventually, after most of the red giant's atmosphere is dissipated, the exposed hot, luminous core emits ultraviolet radiation to ionize the ejected outer layers of the star. Absorbed ultraviolet light energises the shell of nebulous gas around the central star, appearing as a bright coloured planetary nebula at several discrete visible wavelengths.Planetary nebulae may play a crucial role in the chemical evolution of the Milky Way, returning material to the interstellar medium from stars where elements, the products of nucleosynthesis (such as carbon, nitrogen, oxygen and neon), have been created. Planetary nebulae are also observed in more distant galaxies, yielding useful information about their chemical abundances.In recent years, Hubble Space Telescope images have revealed many planetary nebulae to have extremely complex and varied morphologies. About one-fifth are roughly spherical, but the majority are not spherically symmetric. The mechanisms which produce such a wide variety of shapes and features are not yet well understood, but binary central stars, stellar winds and magnetic fields may play a role.