![22. The Milky Way Galaxy](http://s1.studyres.com/store/data/015689985_1-c19ebce33f7e2ac8a4c2d42cea194a4a-300x300.png)
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. ...
Debris Belts Around Vega
... Direct visual searches have turned up empty, suggesting orbiting planets are too small for us to yet detect by this method. The more powerful James Webb Space Telescope or more sensitive groundbased searches may eventually find Jupiter-sized or smaller planets orbiting in Vega’s gap. ...
... Direct visual searches have turned up empty, suggesting orbiting planets are too small for us to yet detect by this method. The more powerful James Webb Space Telescope or more sensitive groundbased searches may eventually find Jupiter-sized or smaller planets orbiting in Vega’s gap. ...
4.1 Introduction 4.2 Visual Binaries
... line of sight. Several hundred visual pairs are known, but in most cases it has not yet been determined whether they are bound binary systems or chance superpositions. Many visual binaries have long orbital periods of several centuries or millennia and therefore have orbits which are uncertain or po ...
... line of sight. Several hundred visual pairs are known, but in most cases it has not yet been determined whether they are bound binary systems or chance superpositions. Many visual binaries have long orbital periods of several centuries or millennia and therefore have orbits which are uncertain or po ...
Hubble Does Double-Duty Science: Finding Planets and
... Out of 229,701 stars that could be searched, 105 showed flares (128 flares total; some stars flared multiple times). The flare energies and peak intensities are consistent with those seen in nearby active stars (1033-1035 ergs), and show a disconnect with solar flare behavior. Based on the star’s br ...
... Out of 229,701 stars that could be searched, 105 showed flares (128 flares total; some stars flared multiple times). The flare energies and peak intensities are consistent with those seen in nearby active stars (1033-1035 ergs), and show a disconnect with solar flare behavior. Based on the star’s br ...
An automated 2 epoch Proper Motion search of UKIDSS and VISTA
... selection, or those with unusual colours (e.g. recent WISE 300 K object). brown dwarf companions to stars. These are benchmark objects with known age, metallicity and Hipparcos distance that can be used to test model atmospheres. brown dwarf kinematics. A probe of formation history over the lifetime ...
... selection, or those with unusual colours (e.g. recent WISE 300 K object). brown dwarf companions to stars. These are benchmark objects with known age, metallicity and Hipparcos distance that can be used to test model atmospheres. brown dwarf kinematics. A probe of formation history over the lifetime ...
Construction and origin of the giant star forming complex
... G173 is a giant star forming complex with size exceeding 100 x 200 pc in Perseus spiral arm of our galaxy. It is well outlined in continuum maps of our Galaxy from 408 MHz to 60 micron and pronounced in Hα emission. The complex contains giant molecular clouds, HII regions, Aur OB1 association and ri ...
... G173 is a giant star forming complex with size exceeding 100 x 200 pc in Perseus spiral arm of our galaxy. It is well outlined in continuum maps of our Galaxy from 408 MHz to 60 micron and pronounced in Hα emission. The complex contains giant molecular clouds, HII regions, Aur OB1 association and ri ...
Powerpoint show - Drew University
... • Cosmological constant (Λ) initially negative • Discarded in 1929 after Hubble discovered the red shift of distant galaxies • However, recent evidence indicates Λ may exist, but with positive value ...
... • Cosmological constant (Λ) initially negative • Discarded in 1929 after Hubble discovered the red shift of distant galaxies • However, recent evidence indicates Λ may exist, but with positive value ...
KEPLER William Borucki, PI
... For false positive elimination and understanding of the Kepler planetary candidates: 1. 300 m/s RV measurements, mr=9-16, avg of 2.5 spectra each Terrestrial planets Case 1, no terrestrial planets ~140 false positives (105 go away with DIA after 4 years) ~131 hr on 2m telescope = ~ 22 nights @ $1500 ...
... For false positive elimination and understanding of the Kepler planetary candidates: 1. 300 m/s RV measurements, mr=9-16, avg of 2.5 spectra each Terrestrial planets Case 1, no terrestrial planets ~140 false positives (105 go away with DIA after 4 years) ~131 hr on 2m telescope = ~ 22 nights @ $1500 ...
Kinesthetic Life Cycle of Stars
... The massive core continues to fuse elements and expands the star so it is even larger. Once the core runs out of fuel, it collapses to form a neutron star. The outer layers then collapse as well. As material falls toward the star’s center, it bounces off the core and explodes outward through the sta ...
... The massive core continues to fuse elements and expands the star so it is even larger. Once the core runs out of fuel, it collapses to form a neutron star. The outer layers then collapse as well. As material falls toward the star’s center, it bounces off the core and explodes outward through the sta ...
4. Stars and resolved stellar populations
... technique which will be extended even further with the advent of Extremely Large Telescopes, such as OWL. MUSE is the research tool of choice to study dense stellar systems: star-forming regions, star clusters, the Galactic bulge, the Magellanic Clouds, the inner disk. It is also ideal for study of ...
... technique which will be extended even further with the advent of Extremely Large Telescopes, such as OWL. MUSE is the research tool of choice to study dense stellar systems: star-forming regions, star clusters, the Galactic bulge, the Magellanic Clouds, the inner disk. It is also ideal for study of ...
PHYSICAL RESEARCH LABORATORY
... 7. Sahijpal S., Goswami J.N. and Davis A.M. (2000) K, Mg, Ca and Ti isotopic compositions and refractory trace element compositions of hibonites from CV and CM meteorites. Geochimica et Cosmochimica Acta 64, 1989-2005. 8. Sahijpal S. and Goswami J.N. (1998) Refractory phases in Primitive Meteorites ...
... 7. Sahijpal S., Goswami J.N. and Davis A.M. (2000) K, Mg, Ca and Ti isotopic compositions and refractory trace element compositions of hibonites from CV and CM meteorites. Geochimica et Cosmochimica Acta 64, 1989-2005. 8. Sahijpal S. and Goswami J.N. (1998) Refractory phases in Primitive Meteorites ...
17. The Universe
... The same thing happens with light from distant galaxies, which appears to be shifted towards the low frequency, red end of the spectrum. This means the distant galaxies must be moving away from the Earth. It has also been observed that the further away a galaxy is, the greater the amount of red shif ...
... The same thing happens with light from distant galaxies, which appears to be shifted towards the low frequency, red end of the spectrum. This means the distant galaxies must be moving away from the Earth. It has also been observed that the further away a galaxy is, the greater the amount of red shif ...
universe new
... The same thing happens with light from distant galaxies, which appears to be shifted towards the low frequency, red end of the spectrum. This means the distant galaxies must be moving away from the Earth. It has also been observed that the further away a galaxy is, the greater the amount of red shif ...
... The same thing happens with light from distant galaxies, which appears to be shifted towards the low frequency, red end of the spectrum. This means the distant galaxies must be moving away from the Earth. It has also been observed that the further away a galaxy is, the greater the amount of red shif ...
Observational Data
... The young and old Leo A disks together with the discovered old halo and sharp stellar edge closely resemble structure as well as stellar and gaseous content found in the large full-fledged disk galaxies. This suggests complex build-up histories of the very low mass galaxies like Leo A, which are sup ...
... The young and old Leo A disks together with the discovered old halo and sharp stellar edge closely resemble structure as well as stellar and gaseous content found in the large full-fledged disk galaxies. This suggests complex build-up histories of the very low mass galaxies like Leo A, which are sup ...
A SEARCH FOR JUPITER-MASS COMPANIONS TO NEAR
... of independent data it is legitimate to narrow the frequency search about the pattern (Larson et al. 1993b). For narrowed frequency searches there are fewer chances for the randomized data to produce large peaks in the periodogram and the false alarm probabilities drop. The conclusion is that the F ...
... of independent data it is legitimate to narrow the frequency search about the pattern (Larson et al. 1993b). For narrowed frequency searches there are fewer chances for the randomized data to produce large peaks in the periodogram and the false alarm probabilities drop. The conclusion is that the F ...
IL CIELO COME LABORATORIO – 2010/2011 STAR FORMATION
... difference of about 1 Mpc between the closest and the furthest arm of the galaxy. The mean quantity of ionizing photons is 8·1049, that is also the amount of the ionized gas. The number of stars which belong to O5 spectral class, needed to warm all the ionized gas is nearly 12 stars. In the same way ...
... difference of about 1 Mpc between the closest and the furthest arm of the galaxy. The mean quantity of ionizing photons is 8·1049, that is also the amount of the ionized gas. The number of stars which belong to O5 spectral class, needed to warm all the ionized gas is nearly 12 stars. In the same way ...
Planets around Stars Beyond the Main Sequence (Evolved Stars)
... 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 ...
Stellar Temperatures
... a) the atmospheric UV cutoff (for U) b) the sensitivity of old photographic plates (for B) c) the sensitivity of the human eye and 1P21 PMT (for V) d) the sensitivity of S20 PMT (for R) Advantage: Historical system, so lots of data available Wide passes, so useful for faint objects Disadvantage: His ...
... a) the atmospheric UV cutoff (for U) b) the sensitivity of old photographic plates (for B) c) the sensitivity of the human eye and 1P21 PMT (for V) d) the sensitivity of S20 PMT (for R) Advantage: Historical system, so lots of data available Wide passes, so useful for faint objects Disadvantage: His ...
Events: - Temecula Valley Astronomers
... The next few objects I’ll describe I have seen up in the Santa Rosa Plateau on a moonless, clear night. Anza in the same conditions would be excellent. Look at the upper-right star of the ‘pot’, Beta. Now, look down about 1 degree towards the bottom-right star Phad. You should be able to see a small ...
... The next few objects I’ll describe I have seen up in the Santa Rosa Plateau on a moonless, clear night. Anza in the same conditions would be excellent. Look at the upper-right star of the ‘pot’, Beta. Now, look down about 1 degree towards the bottom-right star Phad. You should be able to see a small ...
Binocular Sky Newsletter
... In October, we are able to look out of the plane of the Galaxy during the evening. This makes more globular clusters and galaxies available for observation. Very well placed this month are M81 (Bode's Nebula) and M82 (The Cigar Galaxy), both of which are easy in a 50mm binocular. These can be used a ...
... In October, we are able to look out of the plane of the Galaxy during the evening. This makes more globular clusters and galaxies available for observation. Very well placed this month are M81 (Bode's Nebula) and M82 (The Cigar Galaxy), both of which are easy in a 50mm binocular. These can be used a ...
Gemini = برج الجوزاء (May 22
... of a cluster of stars called the Hyades — the second-closest star cluster to Earth. It consists of several hundred stars that lie about 130 light-years away. • Aldebaran outshines all the other stars that outline the bull's face. But Aldebaran isn't a member of the Hyades cluster — it just lies in t ...
... of a cluster of stars called the Hyades — the second-closest star cluster to Earth. It consists of several hundred stars that lie about 130 light-years away. • Aldebaran outshines all the other stars that outline the bull's face. But Aldebaran isn't a member of the Hyades cluster — it just lies in t ...
Sizes of Stars - The University of Texas at Dallas
... than the Sun to convert the hydrogen in their cores into helium, and other stars use up their hydrogen much more quickly. Even though fusion releases a tremendous amount of energy, a lot of heat and pressure is required to make it work. Where does the heat inside a star come from initially so that f ...
... than the Sun to convert the hydrogen in their cores into helium, and other stars use up their hydrogen much more quickly. Even though fusion releases a tremendous amount of energy, a lot of heat and pressure is required to make it work. Where does the heat inside a star come from initially so that f ...
11.3 MB PDF file
... Comet P/Halley Observed at ESO With the recovery of Comet Halley on October 16, 1982, the interest in comets has received a new impetus. Everybody knows this famous comet and when the predicted orbit for its Current return was published in 1977, several astronomers started a systematic search to rec ...
... Comet P/Halley Observed at ESO With the recovery of Comet Halley on October 16, 1982, the interest in comets has received a new impetus. Everybody knows this famous comet and when the predicted orbit for its Current return was published in 1977, several astronomers started a systematic search to rec ...
Transit Epoch
... a transiting hot Jupiter causes TTVs over a few min ground-based observations (even with small telescopes) are useful to search for additional planets in the Kepler era, TTVs will become one of an useful method to search for exoplanets ...
... a transiting hot Jupiter causes TTVs over a few min ground-based observations (even with small telescopes) are useful to search for additional planets in the Kepler era, TTVs will become one of an useful method to search for exoplanets ...
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.