AST 207 Test 2 Answers 20 October 2010
... star A. Prof. Adams says he discovered a new type of star that is fainter than white dwarfs. Has he discovered a new type of star? Explain. The clues are very much like Walter Adams’ discovery that Sirius B is a white dwarf. However, there is a crucial missing clue. Since Sirius A and B were known t ...
... star A. Prof. Adams says he discovered a new type of star that is fainter than white dwarfs. Has he discovered a new type of star? Explain. The clues are very much like Walter Adams’ discovery that Sirius B is a white dwarf. However, there is a crucial missing clue. Since Sirius A and B were known t ...
STAR FORMATION (Ch. 19) - University of Texas Astronomy Home
... This single view nicely illustrates the entire stellar life cycle of stars, starting with the Bok globules (dark clouds) and giant gaseous pillars (emission nebulae), followed by circumstellar disks, and progressing to evolved massive stars in the young starburst cluster.To the upper right of cente ...
... This single view nicely illustrates the entire stellar life cycle of stars, starting with the Bok globules (dark clouds) and giant gaseous pillars (emission nebulae), followed by circumstellar disks, and progressing to evolved massive stars in the young starburst cluster.To the upper right of cente ...
12.4 Evolution of Stars More Massive than the Sun
... • Helium begins to fuse in the core, as a helium flash. The star expands into a red giant as the core continues to collapse. The envelope blows off, leaving a white dwarf to gradually cool. • Nova results from material accreting onto a white dwarf from a companion star ...
... • Helium begins to fuse in the core, as a helium flash. The star expands into a red giant as the core continues to collapse. The envelope blows off, leaving a white dwarf to gradually cool. • Nova results from material accreting onto a white dwarf from a companion star ...
Summary Of the Structure of the Milky Way
... • The Distribution of stars can reveal part of the disk-like nature of the Milky Way galaxy, but are not “deep” enough probes to fully reveal the structure of the Milky Way. • Open clusters can define the thickness of the Milky Way’s thin disk where star formation is active. • Globular clusters allo ...
... • The Distribution of stars can reveal part of the disk-like nature of the Milky Way galaxy, but are not “deep” enough probes to fully reveal the structure of the Milky Way. • Open clusters can define the thickness of the Milky Way’s thin disk where star formation is active. • Globular clusters allo ...
Multi-physics simulations using a hierarchical interchangeable
... increases these bubbles grow until they blow away sizable fractions of the cluster gas and a free-flowing wind develops (4.37 Myr frame). The strong feedback then unbinds most of the gas of the cluster. At approximately 9.5 Myr the cluster ISM has been ejected—the gas visible in this frame originate ...
... increases these bubbles grow until they blow away sizable fractions of the cluster gas and a free-flowing wind develops (4.37 Myr frame). The strong feedback then unbinds most of the gas of the cluster. At approximately 9.5 Myr the cluster ISM has been ejected—the gas visible in this frame originate ...
Mass Segregation in Globular Clusters
... Globular clusters are spherical swarms of stars, typically comprising a million members, and extending a hundred lightyears across. Most galaxies, including our Milky Way, possess a halo of hundreds of globular clusters. (For scale, the Milky Way is about 100,000 light-years in diameter, and the dis ...
... Globular clusters are spherical swarms of stars, typically comprising a million members, and extending a hundred lightyears across. Most galaxies, including our Milky Way, possess a halo of hundreds of globular clusters. (For scale, the Milky Way is about 100,000 light-years in diameter, and the dis ...
Integrative Studies 410 Our Place in the Universe
... • Classic example: Great Hercules Cluster (M13) • Spherical clusters • may contain millions of stars • Old stars • Great tool to study stellar life cycle ...
... • Classic example: Great Hercules Cluster (M13) • Spherical clusters • may contain millions of stars • Old stars • Great tool to study stellar life cycle ...
From the Everett and Seattle Astronomical
... There are several types of nebulae. Emission nebulae are clouds of high temperature gas. The atoms in the cloud are energized by ultraviolet light from a nearby star and emit radiation as they fall back into lower energy states. Emission nebulae are sites of recent and ongoing star formation. The Or ...
... There are several types of nebulae. Emission nebulae are clouds of high temperature gas. The atoms in the cloud are energized by ultraviolet light from a nearby star and emit radiation as they fall back into lower energy states. Emission nebulae are sites of recent and ongoing star formation. The Or ...
The Evening Sky in February 2016
... In February bright stars are nearly overhead. Sirius, the brightest star, is north of the zenith. Canopus, the second brightest star, is south of the zenith. Below and left of Sirius are Orion's bright stars: bluish Rigel and reddish Betelgeuse. Between them is the line of three stars making Orion's ...
... In February bright stars are nearly overhead. Sirius, the brightest star, is north of the zenith. Canopus, the second brightest star, is south of the zenith. Below and left of Sirius are Orion's bright stars: bluish Rigel and reddish Betelgeuse. Between them is the line of three stars making Orion's ...
Astrophysical parameters of ten poorly studied open star clusters
... parameters. The simultaneous fittings were attempted on the J ∼ (J − H) and Ks ∼ (J − Ks ) diagrams for the inner stars, which should be less contaminated by the background field. If the number of stars is not enough for an accepted fitting, the next larger area is included, and so on. In this way, ...
... parameters. The simultaneous fittings were attempted on the J ∼ (J − H) and Ks ∼ (J − Ks ) diagrams for the inner stars, which should be less contaminated by the background field. If the number of stars is not enough for an accepted fitting, the next larger area is included, and so on. In this way, ...
The Milky Way as a Spiral galaxy
... From the motions of stars in the galaxy, and the 21-cm data, we know that the galaxy rotates. The Sun takes ~250 million years to complete one orbit around the galactic center. The inner stars complete their orbits in shorter times. This differential rotation would destroy the spiral arms though, w ...
... From the motions of stars in the galaxy, and the 21-cm data, we know that the galaxy rotates. The Sun takes ~250 million years to complete one orbit around the galactic center. The inner stars complete their orbits in shorter times. This differential rotation would destroy the spiral arms though, w ...
Figure 1
... NGC5253 is a very nearby dwarf Irregular, hosting a central burst of star formation LEGUS observations at F275W and F336W are joined by ACS/WFC and HRC and WFC3/IR images from different programs Availability of both Ha (0.6563 mm) and Pb (1.282 mm) emission lines enables accurate foreground du ...
... NGC5253 is a very nearby dwarf Irregular, hosting a central burst of star formation LEGUS observations at F275W and F336W are joined by ACS/WFC and HRC and WFC3/IR images from different programs Availability of both Ha (0.6563 mm) and Pb (1.282 mm) emission lines enables accurate foreground du ...
The Marathon
... As soon as it is possible to see the guide stars for the first objects, begin looking for the first objects. As darkness begins to prevail over twilight, the first objects must be hunted quickly. Do not linger over them, as they will be difficult to find and see at best. The first hour of observing ...
... As soon as it is possible to see the guide stars for the first objects, begin looking for the first objects. As darkness begins to prevail over twilight, the first objects must be hunted quickly. Do not linger over them, as they will be difficult to find and see at best. The first hour of observing ...
The Sun, Stars, and Beyond
... • Irregularly shaped galaxies also exist, though fewer in number. • A galaxy’s shape is determined by its rate of spin, and if it has been subject to any collisions or mergers. • These all contain 100 billion stars or more, and there are 100 billion galaxies out there! ...
... • Irregularly shaped galaxies also exist, though fewer in number. • A galaxy’s shape is determined by its rate of spin, and if it has been subject to any collisions or mergers. • These all contain 100 billion stars or more, and there are 100 billion galaxies out there! ...
Stars and Galaxies
... It may take several years for a spacecraft to reach other planets in our solar system. It may take several centuries to reach other stars in our galaxy. ...
... It may take several years for a spacecraft to reach other planets in our solar system. It may take several centuries to reach other stars in our galaxy. ...
Introduction to Stars ppt
... luminosity, but still much brighter than main sequence stars of same spectral type. The hot, white, small radius stars near the lower left are called white dwarfs. Giants and Supergiants are stars nearing the ends of their lives because they have already exhausted their core hydrogen. Surprisingly, ...
... luminosity, but still much brighter than main sequence stars of same spectral type. The hot, white, small radius stars near the lower left are called white dwarfs. Giants and Supergiants are stars nearing the ends of their lives because they have already exhausted their core hydrogen. Surprisingly, ...
Ordinary Stars - Edgewood High School
... Color = yellow Example: The Sun Type K Star: 3,500 - 5,000 K Color = Red Example: Aldebaran Type M Star: < 3,500 K Color = Red Example: Betelgeuse ...
... Color = yellow Example: The Sun Type K Star: 3,500 - 5,000 K Color = Red Example: Aldebaran Type M Star: < 3,500 K Color = Red Example: Betelgeuse ...
Integrative Studies 410 Our Place in the Universe
... • Classic example: Great Hercules Cluster (M13) • Spherical clusters • may contain millions of stars • Old stars • Great tool to study stellar life cycle ...
... • Classic example: Great Hercules Cluster (M13) • Spherical clusters • may contain millions of stars • Old stars • Great tool to study stellar life cycle ...
Clusters of galaxies
... As they operate much as a closed box, they are useful as tracers of galaxy evolution and of ...
... As they operate much as a closed box, they are useful as tracers of galaxy evolution and of ...
Planets in different environments
... M67 (3.2-5 Gyrs, 1400 Msun): 3 planet found --> Frequency of hot Jupiters: 2+3.01.5 %, consistent with solar neighbourhood (Brucalassi et al. 2014) NGC6791(3.5 Gyrs), NGC 6253: no planet found (Montalto et al. 2007; Montalto et al. 2011). NGC 2423 (0.75 Gyrs) + NGC 4349 (0.2 Gyrs): 10.6 and 19 ...
... M67 (3.2-5 Gyrs, 1400 Msun): 3 planet found --> Frequency of hot Jupiters: 2+3.01.5 %, consistent with solar neighbourhood (Brucalassi et al. 2014) NGC6791(3.5 Gyrs), NGC 6253: no planet found (Montalto et al. 2007; Montalto et al. 2011). NGC 2423 (0.75 Gyrs) + NGC 4349 (0.2 Gyrs): 10.6 and 19 ...
Globular Clusters Dynamic Lives The
... Top left: A star spends most of its lifetime on the main sequence, burning hydrogen into helium. When the core hydrogen is exhausted the star has reached the main-sequence turnoff, evolving into a red giant while burning hydrogen in a shell around an inert helium core. (Blue-straggler stars form an ...
... Top left: A star spends most of its lifetime on the main sequence, burning hydrogen into helium. When the core hydrogen is exhausted the star has reached the main-sequence turnoff, evolving into a red giant while burning hydrogen in a shell around an inert helium core. (Blue-straggler stars form an ...
Foundation 1 - Discovering Astronomy
... – H2 (mostly), CO, H2O, NH3, H2CO – Most is concentrated in giant molecular clouds ...
... – H2 (mostly), CO, H2O, NH3, H2CO – Most is concentrated in giant molecular clouds ...
Open cluster
An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist. They are loosely bound by mutual gravitational attraction and become disrupted by close encounters with other clusters and clouds of gas as they orbit the galactic center, resulting in a migration to the main body of the galaxy as well as a loss of cluster members through internal close encounters. Open clusters generally survive for a few hundred million years, with the most massive ones surviving for a few billion years. In contrast, the more massive globular clusters of stars exert a stronger gravitational attraction on their members, and can survive for longer. Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring.Young open clusters may still be contained within the molecular cloud from which they formed, illuminating it to create an H II region. Over time, radiation pressure from the cluster will disperse the molecular cloud. Typically, about 10% of the mass of a gas cloud will coalesce into stars before radiation pressure drives the rest of the gas away.Open clusters are key objects in the study of stellar evolution. Because the cluster members are of similar age and chemical composition, their properties (such as distance, age, metallicity and extinction) are more easily determined than they are for isolated stars. A number of open clusters, such as the Pleiades, Hyades or the Alpha Persei Cluster are visible with the naked eye. Some others, such as the Double Cluster, are barely perceptible without instruments, while many more can be seen using binoculars or telescopes. The Wild Duck Cluster, M11, is an example.