Measuring the Distances to the Stars: Parallax What sets the parallax limit?
... Old limit for parallax distances: 20-50 parsecs Hipparcos (1989-1993): 100-200 parsecs (1σ =1 milliarcsec = 1kpc) ...
... Old limit for parallax distances: 20-50 parsecs Hipparcos (1989-1993): 100-200 parsecs (1σ =1 milliarcsec = 1kpc) ...
Astro 10 Practice Test 3
... Choose the ONE best answer and mark it on your Parscore form. 10. The Sun is currently undergoing mass loss. What do we call the physical manifestation of this process? a. Sunspots b. The solar wind c. The Sun’s photosphere d. The Sun’s chromosphere 11. What special type of stellar remnant did Zwick ...
... Choose the ONE best answer and mark it on your Parscore form. 10. The Sun is currently undergoing mass loss. What do we call the physical manifestation of this process? a. Sunspots b. The solar wind c. The Sun’s photosphere d. The Sun’s chromosphere 11. What special type of stellar remnant did Zwick ...
Globular Clusters - Lick Observatory
... the aging of stars of different masses. A freeze frame CMD (color magnitude diagram) of a group of stars with the same age. Can be used to determine the age and distance of a star cluster. ...
... the aging of stars of different masses. A freeze frame CMD (color magnitude diagram) of a group of stars with the same age. Can be used to determine the age and distance of a star cluster. ...
Answer to question 1 - Northwestern University
... But be careful, life is complex: Complications: Two types of Cepheids: type I (also called “classical Cepheids”) and type II; Type I’s are about 4 times brighter for the same period and are found in young star groups called open clusters. Type II’s are also called WW Virginis stars are found in old ...
... But be careful, life is complex: Complications: Two types of Cepheids: type I (also called “classical Cepheids”) and type II; Type I’s are about 4 times brighter for the same period and are found in young star groups called open clusters. Type II’s are also called WW Virginis stars are found in old ...
Chapter14- Our Galaxy - SFA Physics and Astronomy
... In 1917 Harlow Shapley discovered that the globular clusters form a huge spherical system that is not centered on the Earth. ...
... In 1917 Harlow Shapley discovered that the globular clusters form a huge spherical system that is not centered on the Earth. ...
galaxy - 106Thursday130-430
... disk opaque. The disk is quite prominent in our own galaxy and in other spiral galaxies because of its spiral arms, which contain many hot young stars and therefore is luminous. ...
... disk opaque. The disk is quite prominent in our own galaxy and in other spiral galaxies because of its spiral arms, which contain many hot young stars and therefore is luminous. ...
Age Estimates of Globular Clusters in the Milky Way
... estimates of the surface temperature and luminosity of stars as a function of time. These can be compared to observations of stellar colors and magnitudes in order to determine, in principle, the age of an ensemble of stars in a globular cluster. As stars evolve, their location on a temperature-lumi ...
... estimates of the surface temperature and luminosity of stars as a function of time. These can be compared to observations of stellar colors and magnitudes in order to determine, in principle, the age of an ensemble of stars in a globular cluster. As stars evolve, their location on a temperature-lumi ...
CONSTELLATION TUCANA, THE TOUCAN
... not been given a designation by Lacaille who had recognized it as nebulous, and it is now known as the globular cluster 47 Tucanae. Mu Tucanae was dropped by Francis Baily, who felt the star was too faint to warrant a designation, and Kappa's two components came to be known as Kappa1 and Kappa2. DEE ...
... not been given a designation by Lacaille who had recognized it as nebulous, and it is now known as the globular cluster 47 Tucanae. Mu Tucanae was dropped by Francis Baily, who felt the star was too faint to warrant a designation, and Kappa's two components came to be known as Kappa1 and Kappa2. DEE ...
SSG Coordinators will be at the Cronan Ranch observing site at 5
... Sisters. Mistaken by some to be the Little Dipper, the stars of the Pleiades were formed from a contracting cloud of gas and dust about 20 million years ago. At a distance of only 407 light years from us, the nine brightest stars encompass a true diameter of 7 light years. These new, very hot type O ...
... Sisters. Mistaken by some to be the Little Dipper, the stars of the Pleiades were formed from a contracting cloud of gas and dust about 20 million years ago. At a distance of only 407 light years from us, the nine brightest stars encompass a true diameter of 7 light years. These new, very hot type O ...
Integrative Studies 410 Our Place in the Universe
... • Main-sequence star; pressure from nuclear fusion and gravity are in balance – Duration ~ 10 billion years (much longer than all other stages combined) – Temperature ~ 15 million K at core, 6000 K at surface – Size ~ Sun ...
... • Main-sequence star; pressure from nuclear fusion and gravity are in balance – Duration ~ 10 billion years (much longer than all other stages combined) – Temperature ~ 15 million K at core, 6000 K at surface – Size ~ Sun ...
Milky Way
... • Short gamma-ray bursts (< 2 sec): Found in young and old regions. Thought to be two merging neutron stars or a neutron star plus a black hole. ...
... • Short gamma-ray bursts (< 2 sec): Found in young and old regions. Thought to be two merging neutron stars or a neutron star plus a black hole. ...
Pallavicini - IASF Milano
... sources was reported for Praesepe than for the Hyades (Randich & Schmitt 1995) suggesting that a cluster of a given age may not be representative of all clusters with the same age. Age 600 Myr, metallicity about solar Combined exp. time : 279 ks Sensitivity at center: 5 x 1027 erg/s (a factor 4 bett ...
... sources was reported for Praesepe than for the Hyades (Randich & Schmitt 1995) suggesting that a cluster of a given age may not be representative of all clusters with the same age. Age 600 Myr, metallicity about solar Combined exp. time : 279 ks Sensitivity at center: 5 x 1027 erg/s (a factor 4 bett ...
proposed october viewing list
... M11 Known as the Wild Duck cluster, this open cluster in the constellation Scutum, (SKEW-tum) is seen best with the 4” refractor at low magnification. It contains more than 2900 stars and is estimated to be about 250 million years old. M11 is receding from us at a speed of 27 km/s. M17 The Omega, or ...
... M11 Known as the Wild Duck cluster, this open cluster in the constellation Scutum, (SKEW-tum) is seen best with the 4” refractor at low magnification. It contains more than 2900 stars and is estimated to be about 250 million years old. M11 is receding from us at a speed of 27 km/s. M17 The Omega, or ...
22 pm - Starmap
... With a telescope is appears as two faint spots, being the cores of the galaxies. ...
... With a telescope is appears as two faint spots, being the cores of the galaxies. ...
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 ...
2. A giant hand took one of the planets discovered
... Brightest stars 10,000 L Brightest globular clusters 100,000 L Brightest H II regions 100,000 L Etc. Î can now measure distances to more distant galaxies ...
... Brightest stars 10,000 L Brightest globular clusters 100,000 L Brightest H II regions 100,000 L Etc. Î can now measure distances to more distant galaxies ...
Astronomy 102, Spring 2003 Solutions to Review Problems
... 2. Consider a binary system consisting of a main sequence star and a white dwarf companion. Which star is older? Which star started its life with more mass? Given that we’ve talked about how far apart stars are in the galaxy, they almost never run into each other. (It’s a different matter in the cor ...
... 2. Consider a binary system consisting of a main sequence star and a white dwarf companion. Which star is older? Which star started its life with more mass? Given that we’ve talked about how far apart stars are in the galaxy, they almost never run into each other. (It’s a different matter in the cor ...
How Stars Form Powerpoint
... the trigger needed to start the collapse process in an interstellar cloud ...
... the trigger needed to start the collapse process in an interstellar cloud ...
20 pm - Starmap
... Many deep sky objects like galaxies and clusters will be within reach. Jupiter satellites and Saturn’s rings will also be visible. A spectacular experience for beginners in astronomy... ...
... Many deep sky objects like galaxies and clusters will be within reach. Jupiter satellites and Saturn’s rings will also be visible. A spectacular experience for beginners in astronomy... ...
Today`s Powerpoint
... Globular clusters formed 12-14 billion years ago. Useful info for studying the history of the Milky Way Galaxy. ...
... Globular clusters formed 12-14 billion years ago. Useful info for studying the history of the Milky Way Galaxy. ...
RR animation
... RR Lyrae stars pulse in a manner similar to Cepheid variables, so the mechanism for the pulsation is thought to be similar, but the nature and histories of these stars is thought to be rather different. (The average absolute magnitude of an RR Lyrae is 0.75, only 40 or 50 times brighter than our Sun ...
... RR Lyrae stars pulse in a manner similar to Cepheid variables, so the mechanism for the pulsation is thought to be similar, but the nature and histories of these stars is thought to be rather different. (The average absolute magnitude of an RR Lyrae is 0.75, only 40 or 50 times brighter than our Sun ...
Constituents of the Milky Way
... • To help interpret observations of our Galaxy (and others), let’s divide the constituents of the Galaxy into two populations: Population I: objects associated with recent star formation Population II: objects with no connection to recent star formation Thus, short-lived stars, open clusters, da ...
... • To help interpret observations of our Galaxy (and others), let’s divide the constituents of the Galaxy into two populations: Population I: objects associated with recent star formation Population II: objects with no connection to recent star formation Thus, short-lived stars, open clusters, da ...
M = 5.5 - The Millstone
... Globular clusters are generally metal-poor Open clusters are generally more metal-rich There is some correlation between age and metallicity in the Galaxy: Older things tend to be more metal-poor, but this is not a rule.Clusters with Z > .001 are metal poor . ...
... Globular clusters are generally metal-poor Open clusters are generally more metal-rich There is some correlation between age and metallicity in the Galaxy: Older things tend to be more metal-poor, but this is not a rule.Clusters with Z > .001 are metal poor . ...
Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. The name of this category of star cluster is derived from the Latin globulus—a small sphere. A globular cluster is sometimes known more simply as a globular.Globular clusters, which are found in the halo of a galaxy, contain considerably more stars and are much older than the less dense galactic, or open clusters, which are found in the disk. Globular clusters are fairly common; there are about 150 to 158 currently known globular clusters in the Milky Way, with perhaps 10 to 20 more still undiscovered. These globular clusters orbit the Galaxy at radii of 40 kiloparsecs (130,000 light-years) or more. Larger galaxies can have more: Andromeda, for instance, may have as many as 500. Some giant elliptical galaxies, particularly those at the centers of galaxy clusters, such as M87, have as many as 13,000 globular clusters.Every galaxy of sufficient mass in the Local Group has an associated group of globular clusters, and almost every large galaxy surveyed has been found to possess a system of globular clusters. The Sagittarius Dwarf galaxy and the disputed Canis Major Dwarf galaxy appear to be in the process of donating their associated globular clusters (such as Palomar 12) to the Milky Way. This demonstrates how many of this galaxy's globular clusters might have been acquired in the past.Although it appears that globular clusters contain some of the first stars to be produced in the galaxy, their origins and their role in galactic evolution are still unclear. It does appear clear that globular clusters are significantly different from dwarf elliptical galaxies and were formed as part of the star formation of the parent galaxy rather than as a separate galaxy. However, recent conjectures by astronomers suggest that globular clusters and dwarf spheroidals may not be clearly separate and distinct types of objects.