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The quest for life in extrasolar planets
... We are gradually proving that there are many planets similar to the Earth Only a fraction of such planets is habitable Life could have emerged only in a fraction of habitable planets The study of planetary atmospheres could provide signatures for the presence of life in exoplanets It is very importa ...
... We are gradually proving that there are many planets similar to the Earth Only a fraction of such planets is habitable Life could have emerged only in a fraction of habitable planets The study of planetary atmospheres could provide signatures for the presence of life in exoplanets It is very importa ...
ASTRONOMY WEBQUEST…… EXPLORE THE UNIVERSE
... 15. What types of stars make up open clusters, and what is the fate of these stars?____________________ _____________________________________________________________________________________ 16. Describe the cluster that includes our own Sun. ___________________________________________ ______________ ...
... 15. What types of stars make up open clusters, and what is the fate of these stars?____________________ _____________________________________________________________________________________ 16. Describe the cluster that includes our own Sun. ___________________________________________ ______________ ...
University of Groningen Colliding winds in Wolf-Rayet
... where the lower mass stars (< 40 M ) undergo the red supergiant (RSG) phase and the higher ones (> 40 M ) undergo the luminous blue variable (LBV) phase. The Wolf-Rayet phase lasts for about 5 105 years, and the resulting supernovae are of Type Ib and Ic. Since the first detection by Wolf and Ra ...
... where the lower mass stars (< 40 M ) undergo the red supergiant (RSG) phase and the higher ones (> 40 M ) undergo the luminous blue variable (LBV) phase. The Wolf-Rayet phase lasts for about 5 105 years, and the resulting supernovae are of Type Ib and Ic. Since the first detection by Wolf and Ra ...
Document
... Not a black hole from a single stellar collapse, but must be built up over time. We shall meet these again when we come to look at quasars, but we have to ask “Just how active was the young Milky Way”? ...
... Not a black hole from a single stellar collapse, but must be built up over time. We shall meet these again when we come to look at quasars, but we have to ask “Just how active was the young Milky Way”? ...
AAS Members Save on Annual Reviews Journals
... • The Architecture, Chemistry, and Evolution of Continental Magmatic Arcs, Mihai N. Ducea, Jason B. Saleeby, George Bergantz • The Pyrogenic Carbon Cycle, Michael I. Bird, Jonathan G. Wynn, Gustavo Saiz, Christopher M. Wurster, Anna McBeath • Transient Creep and Strain Energy Dissipation, Ulrich H. ...
... • The Architecture, Chemistry, and Evolution of Continental Magmatic Arcs, Mihai N. Ducea, Jason B. Saleeby, George Bergantz • The Pyrogenic Carbon Cycle, Michael I. Bird, Jonathan G. Wynn, Gustavo Saiz, Christopher M. Wurster, Anna McBeath • Transient Creep and Strain Energy Dissipation, Ulrich H. ...
Chemical Evolution of the Galaxy and its satellites
... The clock for the explosion • Single-Degenerate model: the clock to the explosion is given by the lifetime of the secondary star, m2. The minimum time for the appearence of the first Type Ia SN is 30-35 Myr (the lifetime of a 8 Msun star) • Double-Degenerate model: the clock is given by the lifetim ...
... The clock for the explosion • Single-Degenerate model: the clock to the explosion is given by the lifetime of the secondary star, m2. The minimum time for the appearence of the first Type Ia SN is 30-35 Myr (the lifetime of a 8 Msun star) • Double-Degenerate model: the clock is given by the lifetim ...
26.3 Life Cycles of Stars
... hydrogen, gravity gains the upper hand over pressure, and the core starts to shrink. • The core temperature rises enough to cause the hydrogen in a shell outside the core to begin fusion. • The energy flowing outward increases, causing the outer regions of the star to expand. The expanding atmospher ...
... hydrogen, gravity gains the upper hand over pressure, and the core starts to shrink. • The core temperature rises enough to cause the hydrogen in a shell outside the core to begin fusion. • The energy flowing outward increases, causing the outer regions of the star to expand. The expanding atmospher ...
秋 夕(七言絕句) 作者:杜牧 銀燭秋光冷畫屏,輕羅小扇撲流螢。 天階夜色
... Virgo is known as a spring constellation because, although you can see some or all of its stars on most nights of the year, the stars put on their best display in the evening sky during spring. Although blue-white Spica is Virgo's only bright star, it is the 16th-brightest star in the night sky. It ...
... Virgo is known as a spring constellation because, although you can see some or all of its stars on most nights of the year, the stars put on their best display in the evening sky during spring. Although blue-white Spica is Virgo's only bright star, it is the 16th-brightest star in the night sky. It ...
here - Canadian Institute for Theoretical Astrophysics
... clouds of hydrogen and helium gas contract until their cores grow dense and hot enough to ignite (see ‘Planetary standard model’). Some hydrogen and helium does not fall straight into the newborn star, but instead swirls around it, forming a thin, flat disk that orbits the star’s equator. Carried al ...
... clouds of hydrogen and helium gas contract until their cores grow dense and hot enough to ignite (see ‘Planetary standard model’). Some hydrogen and helium does not fall straight into the newborn star, but instead swirls around it, forming a thin, flat disk that orbits the star’s equator. Carried al ...
Stellar Spectra Classification
... Introduction: Classifying stars based on brightness is somewhat problematic. A star’s apparent brightness can be affected by its distance from the observer, its size, or by the presence of interstellar dust. Instead, astronomers classify stars based on the major components of their spectra. Much lik ...
... Introduction: Classifying stars based on brightness is somewhat problematic. A star’s apparent brightness can be affected by its distance from the observer, its size, or by the presence of interstellar dust. Instead, astronomers classify stars based on the major components of their spectra. Much lik ...
planetary standard model
... clouds of hydrogen and helium gas contract until their cores grow dense and hot enough to ignite (see ‘Planetary standard model’). Some hydrogen and helium does not fall straight into the newborn star, but instead swirls around it, forming a thin, flat disk that orbits the star’s equator. Carried al ...
... clouds of hydrogen and helium gas contract until their cores grow dense and hot enough to ignite (see ‘Planetary standard model’). Some hydrogen and helium does not fall straight into the newborn star, but instead swirls around it, forming a thin, flat disk that orbits the star’s equator. Carried al ...
ultracam observations of pulsating sdB stars
... origin of sdB stars Binary evolution is important in at least 2/3 of sdBs (Green, Liebert & Saffer, 2001, ASP 226). Key factor is Roche Lobe Overflow in metal-rich low-mass giants near the Red Giant Tip. Group III (composite) sdBs are the key: i. low-mass binary with initial separation 415-520 R ii ...
... origin of sdB stars Binary evolution is important in at least 2/3 of sdBs (Green, Liebert & Saffer, 2001, ASP 226). Key factor is Roche Lobe Overflow in metal-rich low-mass giants near the Red Giant Tip. Group III (composite) sdBs are the key: i. low-mass binary with initial separation 415-520 R ii ...
RED DWARFS AND THE END OF THE MAIN SEQUENCE
... stars die off. Their contribution to the galactic luminosity is nearly compensated by the increase in luminosity of the smaller stars. The resulting latetime light curve for a large galaxy is thus remarkably constant. Figure 3 shows the expected light curve of our own galaxy under the assumption of ...
... stars die off. Their contribution to the galactic luminosity is nearly compensated by the increase in luminosity of the smaller stars. The resulting latetime light curve for a large galaxy is thus remarkably constant. Figure 3 shows the expected light curve of our own galaxy under the assumption of ...
Document
... Not a black hole from a single stellar collapse, but must be built up over time. We shall meet these again when we come to look at quasars, but we have to ask “Just how active was the young Milky Way”? ...
... Not a black hole from a single stellar collapse, but must be built up over time. We shall meet these again when we come to look at quasars, but we have to ask “Just how active was the young Milky Way”? ...
Tom Maccarone (Texas Tech University)
... Seem to be in the same type of clusters as X-ray sources on the whole, but more objects are needed to be sure Emission line objects present some interesting puzzles Can do fundamental physics with these objects, but they are also important probes of globular cluster dynamics We are starting to see t ...
... Seem to be in the same type of clusters as X-ray sources on the whole, but more objects are needed to be sure Emission line objects present some interesting puzzles Can do fundamental physics with these objects, but they are also important probes of globular cluster dynamics We are starting to see t ...
Nucleosynthesis in asymptotic giant branch stars
... the so called hot bottom burning (HBB). This is an envelope convective burning, where the convective envelope reaches the top of the H-burning shell (see Fig. 2). But such a process does not occur unless the initial stellar mass is above 4 M¯ in case of initial solar-like metallicity, but it could a ...
... the so called hot bottom burning (HBB). This is an envelope convective burning, where the convective envelope reaches the top of the H-burning shell (see Fig. 2). But such a process does not occur unless the initial stellar mass is above 4 M¯ in case of initial solar-like metallicity, but it could a ...
ν - Luleå tekniska universitet
... kilometres in diameter down to rocks just tens of metres. The Barringer Crater ...
... kilometres in diameter down to rocks just tens of metres. The Barringer Crater ...
Life of a Star Observations
... Eyepiece: _________________________ Magnification: _____________________ ...
... Eyepiece: _________________________ Magnification: _____________________ ...
Lecture15
... Degenerate cores • When the density of a gas gets sufficiently high, the Pauli exclusion principle applies: no two fermions (e.g. electrons) can occupy the same quantum state. Pressure becomes due to the nonthermal motions of electrons, and is independent of temperature ...
... Degenerate cores • When the density of a gas gets sufficiently high, the Pauli exclusion principle applies: no two fermions (e.g. electrons) can occupy the same quantum state. Pressure becomes due to the nonthermal motions of electrons, and is independent of temperature ...
Presentation - Copernicus.org
... Solar System properties that depend on birth environment: - evidence of short-lived radionuclides in meteorites - dynamical properties of outer planets and Kuiper Belt ...
... Solar System properties that depend on birth environment: - evidence of short-lived radionuclides in meteorites - dynamical properties of outer planets and Kuiper Belt ...
Faintest Star Cluster Yet Found on Outskirts of Milky Way | Globular
... The globular cluster is so faint, it is pushing the boundaries of how small and dim scientists think such objects can be. ...
... The globular cluster is so faint, it is pushing the boundaries of how small and dim scientists think such objects can be. ...
Chapter 10 - Croydon Music and Arts
... A hard copy of our classroom Croydon Music Star planner can also be displayed. For all other pupils the record of their progress is kept in the Practice Booklet (for primary beginners until they have completed their Music Stars) and in teachers’ lesson notes. The criteria in the Practice Booklet are ...
... A hard copy of our classroom Croydon Music Star planner can also be displayed. For all other pupils the record of their progress is kept in the Practice Booklet (for primary beginners until they have completed their Music Stars) and in teachers’ lesson notes. The criteria in the Practice Booklet are ...
Be Sure to look at 2 things - Fort Worth Astronomical Society
... Cluster in Perseus, they do make a nice pair. 7788 is about 4-5' in diameter and is composed of about 10-12 stars. 7790 is a bit larger and brighter. Well worth the look. NGC 7789 - One of my favorite objects, this cluster is about 15' in diameter and composed of hundreds of stars. The stars are abo ...
... Cluster in Perseus, they do make a nice pair. 7788 is about 4-5' in diameter and is composed of about 10-12 stars. 7790 is a bit larger and brighter. Well worth the look. NGC 7789 - One of my favorite objects, this cluster is about 15' in diameter and composed of hundreds of stars. The stars are abo ...
Section 14
... If the white dwarf is part of a system of two or more stars, it can lead to an interesting effect. As the non-white dwarf star produces energy, it is also emitting mass. This mass can accumulate on the surface of the white dwarf. If enough mass accumulates, it can lead to fusion processes within it ...
... If the white dwarf is part of a system of two or more stars, it can lead to an interesting effect. As the non-white dwarf star produces energy, it is also emitting mass. This mass can accumulate on the surface of the white dwarf. If enough mass accumulates, it can lead to fusion processes within it ...
astrophysics - The University of Sydney
... heavier and heavier elements to stave off the next collapse. The core reaches temperatures by converting gravitational energy into thermal energy. Each time the star runs out of fuel, the inexorable collapse due to gravity begins again. The fate of stars from this point depends on their mass. Low mas ...
... heavier and heavier elements to stave off the next collapse. The core reaches temperatures by converting gravitational energy into thermal energy. Each time the star runs out of fuel, the inexorable collapse due to gravity begins again. The fate of stars from this point depends on their mass. Low mas ...
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.