Disk Instability Models
... • Surface T = 50 K means lower midplane T • No artificial viscosity so no irreversible heating in shock fronts and a =0 assumed • Cooling time ~ 1-2 P ...
... • Surface T = 50 K means lower midplane T • No artificial viscosity so no irreversible heating in shock fronts and a =0 assumed • Cooling time ~ 1-2 P ...
Field Star Distributions of the Hercules Thick Disk Cloud
... The Hercules Thick Disk Cloud (Larsen et al. 2009) was initially discovered as an excess in the number of faint blue stars between quadrants I and IV of the Galaxy. The field stars responsible for the excess, are between 2 and 4 kiloparsecs from the Sun, 1.2 kpc above the Galactic plane, and the asy ...
... The Hercules Thick Disk Cloud (Larsen et al. 2009) was initially discovered as an excess in the number of faint blue stars between quadrants I and IV of the Galaxy. The field stars responsible for the excess, are between 2 and 4 kiloparsecs from the Sun, 1.2 kpc above the Galactic plane, and the asy ...
CONSTELLATION PERSEUS The constellation
... apparent magnitude of 1.79. A supergiant of spectral type F5Ib located around 590 light-years away from Earth, Mirfak has 5,000 times the luminosity and 42 times the diameter of our Sun. It is the brightest member of the Alpha Persei Cluster, an open cluster containing many luminous stars. • Zeta Pe ...
... apparent magnitude of 1.79. A supergiant of spectral type F5Ib located around 590 light-years away from Earth, Mirfak has 5,000 times the luminosity and 42 times the diameter of our Sun. It is the brightest member of the Alpha Persei Cluster, an open cluster containing many luminous stars. • Zeta Pe ...
“And God Said, Let There Be Lights in the Firmament of Heaven”
... star to provide heat and light as well as a constant gravitational field in which to orbit most stars occur in clusters ranging from pairs to swarms numbering tens of thousands none of these is a good candidate in the complex and constantly varying gravitational environment of star clusters there ar ...
... star to provide heat and light as well as a constant gravitational field in which to orbit most stars occur in clusters ranging from pairs to swarms numbering tens of thousands none of these is a good candidate in the complex and constantly varying gravitational environment of star clusters there ar ...
Satellities - stoweschools.com
... Velocity of the Geostationary Satellite with respect to the sun ...
... Velocity of the Geostationary Satellite with respect to the sun ...
6 The mysterious universe
... Ancient astronomers grouped stars according to the shapes they seemed to form. The shapes were usually of gods, animals or familiar objects. The most wellknown constellations are the 12 groups we know as the signs of the zodiac. These constellations follow the ecliptic and their names include Taurus ...
... Ancient astronomers grouped stars according to the shapes they seemed to form. The shapes were usually of gods, animals or familiar objects. The most wellknown constellations are the 12 groups we know as the signs of the zodiac. These constellations follow the ecliptic and their names include Taurus ...
Globular Clusters
... evolution theory. When GCs are considered just as a million or so pointlike masses in a small volume, subject to internal and external dynamical interactions, they represent an ideal workbench to study STELLAR DYNAMICS and to test most exquisite theoretical dynamical models. If studied as a global s ...
... evolution theory. When GCs are considered just as a million or so pointlike masses in a small volume, subject to internal and external dynamical interactions, they represent an ideal workbench to study STELLAR DYNAMICS and to test most exquisite theoretical dynamical models. If studied as a global s ...
east and west encounter at sea
... of the Pole Star. Let us try to explain those rules, with the help of the figures that follows. Fig. 2a shows the Little Bear, with its stars, from which the Kochab (one of the guards of the this constellation), and the Pole Star are well ...
... of the Pole Star. Let us try to explain those rules, with the help of the figures that follows. Fig. 2a shows the Little Bear, with its stars, from which the Kochab (one of the guards of the this constellation), and the Pole Star are well ...
Mass determinations of PMS stars with the
... Results and future prospectives • In an 8 years campaign of spectroscopical observations we have discovered 9 PMS SB with period > 50 days that are suitable for observations with AMBER • We already had observations of BS Indi (K=6.6 mag) with AMBER but the signal resulted to be too faint (+ no stan ...
... Results and future prospectives • In an 8 years campaign of spectroscopical observations we have discovered 9 PMS SB with period > 50 days that are suitable for observations with AMBER • We already had observations of BS Indi (K=6.6 mag) with AMBER but the signal resulted to be too faint (+ no stan ...
APOD 2016 Calendar
... Explanation: What does the magnetic field of our Galaxy look like? It has long been known that a modest magnetic field pervades our Milky Way Galaxy because it is seen to align small dust grains that scatter background light. Only recently, however, has the Sun-orbiting Planck satellite made a high- ...
... Explanation: What does the magnetic field of our Galaxy look like? It has long been known that a modest magnetic field pervades our Milky Way Galaxy because it is seen to align small dust grains that scatter background light. Only recently, however, has the Sun-orbiting Planck satellite made a high- ...
Lecture 17: Black Holes
... Alternative hypothesis: interacting, massive dark matter particle • Dark matter particles are captured by stars, and settle in the center to a thermal distribution. • If sufficient dark matter accumulates, it collapses into a self-gravitating object in the star center. • If the dark matter mass is ...
... Alternative hypothesis: interacting, massive dark matter particle • Dark matter particles are captured by stars, and settle in the center to a thermal distribution. • If sufficient dark matter accumulates, it collapses into a self-gravitating object in the star center. • If the dark matter mass is ...
55-80 BIOGRAPHY_of_A STAR
... enough for helium fusion to begin? A. Helium fusion slowly starts up B. Hydrogen fusion stops C. Helium fusion (triple alpha) starts very sharply Hint: this is a strong reaction (no neutrinos) once the temperature is hot enough to overcome ...
... enough for helium fusion to begin? A. Helium fusion slowly starts up B. Hydrogen fusion stops C. Helium fusion (triple alpha) starts very sharply Hint: this is a strong reaction (no neutrinos) once the temperature is hot enough to overcome ...
Slide 1
... The nature of dark energy is unclear. It is thought to be a form of background energy present throughout space and time. It is more prominent than gravity at large distances as gravity becomes weaker with distance (inverse square law) whereas the force associated with dark energy is thought to remai ...
... The nature of dark energy is unclear. It is thought to be a form of background energy present throughout space and time. It is more prominent than gravity at large distances as gravity becomes weaker with distance (inverse square law) whereas the force associated with dark energy is thought to remai ...
Document
... winds heat and compress the disk causing agglomeration out to the snow line. The cores grow by collecting material infalling toward the star. They are in unstable orbits that can change radically or they can be ejected from the system. A core in a highly eccentric orbit that goes far into the disk c ...
... winds heat and compress the disk causing agglomeration out to the snow line. The cores grow by collecting material infalling toward the star. They are in unstable orbits that can change radically or they can be ejected from the system. A core in a highly eccentric orbit that goes far into the disk c ...
Exploring the Variable Sky with the Catalina Real-Time
... Distinct Events Detection Statistics as of 30 Nov 2010 UT: ...
... Distinct Events Detection Statistics as of 30 Nov 2010 UT: ...
Exploration of the Milky Way and Nearby galaxies
... Based on the apparent absence of the most metal-poor stars in present-day dwarf galaxies, recent studies (Helmi et al. 2006) claimed that the true Galactic building blocks must have been vastly different from the surviving dwarfs. The discovery of an extremely iron-poor star (S102054, [Fe/H] -3.8) ...
... Based on the apparent absence of the most metal-poor stars in present-day dwarf galaxies, recent studies (Helmi et al. 2006) claimed that the true Galactic building blocks must have been vastly different from the surviving dwarfs. The discovery of an extremely iron-poor star (S102054, [Fe/H] -3.8) ...
nasafinal - University of Oregon
... years such galaxies were not thought to exist as the implied low surface mass density seemed to be physically implausible. However, the PI and his colleagues have established, over many years of research, that such galaxies do exist, that they are among the most massive galaxies known, and that thei ...
... years such galaxies were not thought to exist as the implied low surface mass density seemed to be physically implausible. However, the PI and his colleagues have established, over many years of research, that such galaxies do exist, that they are among the most massive galaxies known, and that thei ...
CAPSTONE-poster
... The famous astronomer William Herschel discovered the first planetary nebulae called Dumbbell nebula (M27) in the 1870’s. The name was given because he found an apparent similarity to the disk of Uranus. So far, there are 2,000 planetary nebulae in our Milky Way galaxy and their average lifespan is ...
... The famous astronomer William Herschel discovered the first planetary nebulae called Dumbbell nebula (M27) in the 1870’s. The name was given because he found an apparent similarity to the disk of Uranus. So far, there are 2,000 planetary nebulae in our Milky Way galaxy and their average lifespan is ...
A Chandra Observation of the Massive Star-Forming
... archival HST/WFPC2 F814W image of the interface between massive stars and the molecular cloud. Chandra detects sources where HST and 2MASS suffer from extinction, nebulosities, and diffraction spikes. ...
... archival HST/WFPC2 F814W image of the interface between massive stars and the molecular cloud. Chandra detects sources where HST and 2MASS suffer from extinction, nebulosities, and diffraction spikes. ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.