First firm spectral classification of an early-B PMS star
... massive nearby star-forming regions in the Galaxy (Hoffmeister et al. 2008; Broos et al. 2007; Povich et al. 2009). For the “normal” OB stars Hanson et al. (1997) found a good correspondence between the optical and K -band spectra, but the massive YSO optical spectra remained inconclusive. For four ...
... massive nearby star-forming regions in the Galaxy (Hoffmeister et al. 2008; Broos et al. 2007; Povich et al. 2009). For the “normal” OB stars Hanson et al. (1997) found a good correspondence between the optical and K -band spectra, but the massive YSO optical spectra remained inconclusive. For four ...
Timescales of stellar evolution 1. Dynamical time scale Measure of
... Timescales of stellar evolution 1. Dynamical time scale Measure of the time scale on which a star would expand or contract if the balance between pressure gradients and gravity was suddenly disrupted (same as free-fall time scale): characteristic radius R t dyn≡ ...
... Timescales of stellar evolution 1. Dynamical time scale Measure of the time scale on which a star would expand or contract if the balance between pressure gradients and gravity was suddenly disrupted (same as free-fall time scale): characteristic radius R t dyn≡ ...
The measure of Cosmological distances
... Found new planet (Uranus)Discover Infra-Red lightFirst map of the sky: Idea: All the stars are the same. Therefore, bright stars are closer. ...
... Found new planet (Uranus)Discover Infra-Red lightFirst map of the sky: Idea: All the stars are the same. Therefore, bright stars are closer. ...
Chapter 10 The Bizarre Stellar Graveyard
... Tidal forces would be gentler near a supermassive black hole because its radius is much bigger. ...
... Tidal forces would be gentler near a supermassive black hole because its radius is much bigger. ...
July - Westchester Amateur Astronomers
... their planets are freshly formed, and thus warmer and brighter than older planetary bodies. Astronomers know of more than five hundred distant planets, but very few have actually been seen. Many exoplanets are detected indirectly by means of their “wobbles”—the gravitational tugs they exert on their ...
... their planets are freshly formed, and thus warmer and brighter than older planetary bodies. Astronomers know of more than five hundred distant planets, but very few have actually been seen. Many exoplanets are detected indirectly by means of their “wobbles”—the gravitational tugs they exert on their ...
Lecture5 - Tufts Institute of Cosmology
... Irony of the Debate • Sun moved away from the Center of the Galaxy – Shapley is right • There are other galaxies outside our own – Curtis was right BUT: Both were wrong too about different aspects of the debate. ...
... Irony of the Debate • Sun moved away from the Center of the Galaxy – Shapley is right • There are other galaxies outside our own – Curtis was right BUT: Both were wrong too about different aspects of the debate. ...
The Planets in our Solar System Solar System Basics
... • About 15 times larger than Earth • Composed of hydrogen and helium – Light, very low density – Jupiter, Saturn, Uranus, Neptune ...
... • About 15 times larger than Earth • Composed of hydrogen and helium – Light, very low density – Jupiter, Saturn, Uranus, Neptune ...
Section 3: Three Periodicities - Wobble, Tilt, and
... stationary bright "central" star to the right of the picture. The bright star is Polaris; because of the rotation of the Earth on its axis (that same rotation that gives us day and night), the other stars seem to be circling a stationary North Star. They're not, of course - but the rotation of the E ...
... stationary bright "central" star to the right of the picture. The bright star is Polaris; because of the rotation of the Earth on its axis (that same rotation that gives us day and night), the other stars seem to be circling a stationary North Star. They're not, of course - but the rotation of the E ...
L11
... Is there an upper mass cut-off ? What are the masses of the most massive stars ? The most luminous stars in the galaxy have inferred masses of ~150-300M but this value depends on estimate of logL/L and Teff. The former requires distance, reddening, bolometric correction and the later requires reli ...
... Is there an upper mass cut-off ? What are the masses of the most massive stars ? The most luminous stars in the galaxy have inferred masses of ~150-300M but this value depends on estimate of logL/L and Teff. The former requires distance, reddening, bolometric correction and the later requires reli ...
Published by the Association Pro ISSI No. 37, May 2016
... to form a beautiful planetary nebula similar to those you may know from the skyrockets on Swiss National Holiday. That is what physics requires stars to do at the end of their lives. Yet, physics has much more in stock. Take for example a black hole. It is a kind of a handy star, perhaps a mere 20 k ...
... to form a beautiful planetary nebula similar to those you may know from the skyrockets on Swiss National Holiday. That is what physics requires stars to do at the end of their lives. Yet, physics has much more in stock. Take for example a black hole. It is a kind of a handy star, perhaps a mere 20 k ...
Stars: from Adolescence to Old Age
... Shell burning starts •outer layers of star expand •core continues to contract ...
... Shell burning starts •outer layers of star expand •core continues to contract ...
V - ESO
... (Hunter et al. 1996, ApJ 459, L27), indicating a mass of 4x104 M in stars more massive than M > 1M. ...
... (Hunter et al. 1996, ApJ 459, L27), indicating a mass of 4x104 M in stars more massive than M > 1M. ...
March 2016 Star Diagonal - Ogden Astronomical Society
... When you think about the new stars forming in the Milky Way, you probably think of the giant star-forming regions like the Orion Nebula, containing thousands of new stars with light so bright it's visible to the naked eye. At over 400 parsecs (1,300 light years) distant, it's one of the most spectac ...
... When you think about the new stars forming in the Milky Way, you probably think of the giant star-forming regions like the Orion Nebula, containing thousands of new stars with light so bright it's visible to the naked eye. At over 400 parsecs (1,300 light years) distant, it's one of the most spectac ...
Study Guide: Use your notes and handouts to answer the following
... Uranus. It is covered by a thick layer of gas, and has a fairly uniform blue-green color. Uranus is surrounded by a system of nine rings. Tilted almost on its side Neptune. Its atmosphere appears blue and is marked by large dark blue storm systems. 4. What determines how long a planet’s period of re ...
... Uranus. It is covered by a thick layer of gas, and has a fairly uniform blue-green color. Uranus is surrounded by a system of nine rings. Tilted almost on its side Neptune. Its atmosphere appears blue and is marked by large dark blue storm systems. 4. What determines how long a planet’s period of re ...
Chapter 14. Stellar Structure and Evolution
... Inevitably a star will exhaust the H in its core, having converted it to He. The Sun is about half way through that process. In the core of the Sun, we believe the present composition is about 50% He. As the He is created, the core of the star must move to slightly higher temperatures and pressures ...
... Inevitably a star will exhaust the H in its core, having converted it to He. The Sun is about half way through that process. In the core of the Sun, we believe the present composition is about 50% He. As the He is created, the core of the star must move to slightly higher temperatures and pressures ...
galaxies and stars
... less luminous and have a lower surface temperature less luminous and have a higher surface temperature more luminous and have a lower surface temperature more luminous and have a higher surface temperature ...
... less luminous and have a lower surface temperature less luminous and have a higher surface temperature more luminous and have a lower surface temperature more luminous and have a higher surface temperature ...
Photoelectric Photometry of the Pleiades
... lot of desired photons, and only a little noise. To obtain the most accurate readings, you should strive for S/N Ratio’s of 100 or more. You can increase the S/N Ratio by increasing the integration time because the S/N Ratio is directly proportional to the square root of the total collected raw coun ...
... lot of desired photons, and only a little noise. To obtain the most accurate readings, you should strive for S/N Ratio’s of 100 or more. You can increase the S/N Ratio by increasing the integration time because the S/N Ratio is directly proportional to the square root of the total collected raw coun ...
Sol_157a_midterm_2016
... Next, we notice that kaolinite has features in both bands 2 and 4. But so does montmorillonite. However, kaolinite has a much larger transmission in band 3 than montmorillonite. Hence, absorption features in both bands 2 and 4 select these two materials. The final identification is then made using t ...
... Next, we notice that kaolinite has features in both bands 2 and 4. But so does montmorillonite. However, kaolinite has a much larger transmission in band 3 than montmorillonite. Hence, absorption features in both bands 2 and 4 select these two materials. The final identification is then made using t ...
Using the Southern Cross to find south
... in the sky and therefore upside-down). 3. Extend the line four and a half times the length of the cross. 4. This will bring you to the point in the sky called the South Celestial Pole. 5. From this point, drop a line vertically down to the horizon. This gives you the direction of true south. Compass ...
... in the sky and therefore upside-down). 3. Extend the line four and a half times the length of the cross. 4. This will bring you to the point in the sky called the South Celestial Pole. 5. From this point, drop a line vertically down to the horizon. This gives you the direction of true south. Compass ...
Space exploration - Menihek Home Page
... This means that he thought the Earth was the centre of the universe, and that the sun, moon, stars and other planets revolved around it. He based this theory on the fact that he did not see the patterns of the stars in the sky change, so he assumed that the Earth was not moving because if it was t ...
... This means that he thought the Earth was the centre of the universe, and that the sun, moon, stars and other planets revolved around it. He based this theory on the fact that he did not see the patterns of the stars in the sky change, so he assumed that the Earth was not moving because if it was t ...
Lecture 15 Star Formation and Evolution 3/7
... about 100,000,000 degrees K for He burning Stars like our Sun remain main sequence longer due to this PHYS 162 ...
... about 100,000,000 degrees K for He burning Stars like our Sun remain main sequence longer due to this PHYS 162 ...
Document
... • When fuel is completely gone, the medium mass stars will shrink on their own gravity. • Red giants will turn into dwarf stars depending on the amount of energy left (red dwarf, white ...
... • When fuel is completely gone, the medium mass stars will shrink on their own gravity. • Red giants will turn into dwarf stars depending on the amount of energy left (red dwarf, white ...
FUN THINGS TO DO
... wandering around during the day and maybe checking out the stars at night. What constellations would the dinosaurs have seen back then? They would be different ones from those we see now! ...
... wandering around during the day and maybe checking out the stars at night. What constellations would the dinosaurs have seen back then? They would be different ones from those we see now! ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.