AST1100 Lecture Notes
... When the inner core consisting mainly of neutrons becomes degenerate, the collapse is suddenly stopped, the core bounces back and an energetic shock wave is generated. This shock wave travels outwards from the core but is blocked by the massive and dense ’iron cap’, the outer core, which is in free ...
... When the inner core consisting mainly of neutrons becomes degenerate, the collapse is suddenly stopped, the core bounces back and an energetic shock wave is generated. This shock wave travels outwards from the core but is blocked by the massive and dense ’iron cap’, the outer core, which is in free ...
Star Formation in Bok Globules - European Southern Observatory
... radiation fram the star is being absorbed in this shell, wh ich reemits it as infrared radiation. Its visual magnitude varies by several tenths of a magnitude in an irregular manner on timescales of days, while its infrared magnitudes have been constant over nearly two years. The luminosity of Serne ...
... radiation fram the star is being absorbed in this shell, wh ich reemits it as infrared radiation. Its visual magnitude varies by several tenths of a magnitude in an irregular manner on timescales of days, while its infrared magnitudes have been constant over nearly two years. The luminosity of Serne ...
Galaxies - Indiana University Astronomy
... For Wednesday, April 8 Part 7: Supernova in M51 At least two supernovae have been detected in recent years in the nearby Whirlpool Galaxy, Messier 51. M51 is located at a distance of about 31 million light years (about 10 megaparsecs) in the direction of the constellation Canes Venatici. Stars can ...
... For Wednesday, April 8 Part 7: Supernova in M51 At least two supernovae have been detected in recent years in the nearby Whirlpool Galaxy, Messier 51. M51 is located at a distance of about 31 million light years (about 10 megaparsecs) in the direction of the constellation Canes Venatici. Stars can ...
z - STScI
... Redshifts: Lyman a to z = 40 (?) 4000 Å to z = 10 NGST will detect 1 M yr-1 for 106 yrs to z 20 and 108 M at 1 Gyr to z 10 (conservatively assuming W = 0.2) ...
... Redshifts: Lyman a to z = 40 (?) 4000 Å to z = 10 NGST will detect 1 M yr-1 for 106 yrs to z 20 and 108 M at 1 Gyr to z 10 (conservatively assuming W = 0.2) ...
17_Testbank
... A) 2 B) 3 C) 4 D) varies depending on the reaction E) none of the above Answer: B 17) The helium fusion process results in the production of A) hydrogen. B) oxygen. C) carbon. D) nitrogen. E) iron. Answer: C 18) What happens after a helium flash? A) The core quickly heats up and expands. B) The star ...
... A) 2 B) 3 C) 4 D) varies depending on the reaction E) none of the above Answer: B 17) The helium fusion process results in the production of A) hydrogen. B) oxygen. C) carbon. D) nitrogen. E) iron. Answer: C 18) What happens after a helium flash? A) The core quickly heats up and expands. B) The star ...
document
... What happens in a low-mass star when core temperature rises enough for helium fusion to begin? A. Helium fusion slowly starts up. B. Hydrogen fusion stops. C. Helium fusion rises very sharply. (Hint: Degeneracy pressure is the main form of pressure in the inert helium core.) ...
... What happens in a low-mass star when core temperature rises enough for helium fusion to begin? A. Helium fusion slowly starts up. B. Hydrogen fusion stops. C. Helium fusion rises very sharply. (Hint: Degeneracy pressure is the main form of pressure in the inert helium core.) ...
Milky Way Bulge
... • Field stars = high velocity stars • ~150 globular clusters known, in 2 different systems: • Older (~13 Gyr) • -2.5 < [Fe/H] < -0.8 • Spherical distribution around galactic center • No net rotation ...
... • Field stars = high velocity stars • ~150 globular clusters known, in 2 different systems: • Older (~13 Gyr) • -2.5 < [Fe/H] < -0.8 • Spherical distribution around galactic center • No net rotation ...
Small Wonders: Cygnus
... Small Wonders: Cygnus A monthly sky guide for the beginning to intermediate amateur astronomer ...
... Small Wonders: Cygnus A monthly sky guide for the beginning to intermediate amateur astronomer ...
PLANETS
... Analysis of Hubble Space Telescope data indicated that planets were only beginning to form around Beta Pictoris, a very young star at between 20 million and 100 million years old. Most dust grains in the disk are not agglomerating to form larger bodies; instead, they are eroding and being moved away ...
... Analysis of Hubble Space Telescope data indicated that planets were only beginning to form around Beta Pictoris, a very young star at between 20 million and 100 million years old. Most dust grains in the disk are not agglomerating to form larger bodies; instead, they are eroding and being moved away ...
10 - Keele Astrophysics Group
... the continuum. By the end of that century, astronomers were able to examine the spectra of stars in large numbers and realised that stars could be divided into groups according to the general appearance of their spectra. Classification schemes were developed that grouped together stars depending on ...
... the continuum. By the end of that century, astronomers were able to examine the spectra of stars in large numbers and realised that stars could be divided into groups according to the general appearance of their spectra. Classification schemes were developed that grouped together stars depending on ...
Omega Centauri
... Y=0.40 (e.g., Omega Centauri, NGC2808) 3.Clusters with broadened or splitted MS (as NGC6752 and 47Tuc) 4.Complex objects like M54 (= Omega Cen?) 5.Intermediate objects like M22 (=M54, Omega Cen?) 6.Clusters with double SGB or RGB (e.g., NGC 1851, NGC6388, NGC 5286, M4, and many others) 7.The LMC/SMC ...
... Y=0.40 (e.g., Omega Centauri, NGC2808) 3.Clusters with broadened or splitted MS (as NGC6752 and 47Tuc) 4.Complex objects like M54 (= Omega Cen?) 5.Intermediate objects like M22 (=M54, Omega Cen?) 6.Clusters with double SGB or RGB (e.g., NGC 1851, NGC6388, NGC 5286, M4, and many others) 7.The LMC/SMC ...
The Parallax Activity: Measuring the Distances to
... 2. Running the activity to collect data Divide your class into teams of four students each. Pro- vide each team with a quadrant. If you have time, it would be good for each team to make their own quadrant. Take the class outside to where you have marked ...
... 2. Running the activity to collect data Divide your class into teams of four students each. Pro- vide each team with a quadrant. If you have time, it would be good for each team to make their own quadrant. Take the class outside to where you have marked ...
Feedback - Cambridge University Press
... This prediction can be tested in the Milky Way. We have combined the WMAP freefree map to find free-free emission regions and the associated star forming complexes seen in Spitzer GLIMPSE images. The free-free emission of a star cluster is provided primarily by stars with M∗ 40M ; since these star ...
... This prediction can be tested in the Milky Way. We have combined the WMAP freefree map to find free-free emission regions and the associated star forming complexes seen in Spitzer GLIMPSE images. The free-free emission of a star cluster is provided primarily by stars with M∗ 40M ; since these star ...
Stars in Their Youth
... Energy Generation in the Main Sequence As mentioned above, the most distinguishing feature of the stars on the main sequence is that they are converting hydrogen into helium in their cores. In the Chap. 1 we outlined the extraordinary conjecture by Eddington. But it took nearly twenty years to work ...
... Energy Generation in the Main Sequence As mentioned above, the most distinguishing feature of the stars on the main sequence is that they are converting hydrogen into helium in their cores. In the Chap. 1 we outlined the extraordinary conjecture by Eddington. But it took nearly twenty years to work ...
ASTR2100 - Saint Mary's University | Astronomy & Physics
... The issue reached a turning point in 1920 with the well known Shapley-Curtis debate on the extent of the Galactic system. The merits of the arguments presented on both sides of this debate have been the subject of considerable study over the years, but it was years later before the true extragalact ...
... The issue reached a turning point in 1920 with the well known Shapley-Curtis debate on the extent of the Galactic system. The merits of the arguments presented on both sides of this debate have been the subject of considerable study over the years, but it was years later before the true extragalact ...
starwalk2 manual en
... The highlighted parameter will start changing accordingly. To make any parameter elapse automatically, tap one of them and drag the Time slider. The map sky will rotate. In order to stop that, tap the Time slider again. To return to the current time zone, tap ...
... The highlighted parameter will start changing accordingly. To make any parameter elapse automatically, tap one of them and drag the Time slider. The map sky will rotate. In order to stop that, tap the Time slider again. To return to the current time zone, tap ...
A Search for New Solar-Type Post-T Tauri Stars in
... chromospheric activity index. The expected stellar locus is indicated by the solid lines for surface gravities of 5.0 (blue), 4.0 (green), and 3.0 (red) with redder UV-J colors at lower surface gravity in spectral types earlier than M. The young stars targetted in our investigation are expected to h ...
... chromospheric activity index. The expected stellar locus is indicated by the solid lines for surface gravities of 5.0 (blue), 4.0 (green), and 3.0 (red) with redder UV-J colors at lower surface gravity in spectral types earlier than M. The young stars targetted in our investigation are expected to h ...
Section 4 Formation of the Universe Chapter 19
... • Describe the contents and characteristics of galaxies. • Explain why looking at distant galaxies reveals what young galaxies looked like.. ...
... • Describe the contents and characteristics of galaxies. • Explain why looking at distant galaxies reveals what young galaxies looked like.. ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.