Distance
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
Summary: Modes of Star Formation
... internal motions are relatively small, and they then become moving groups or streams. The weak-lined T Tauri stars found by X-ray observations that were discussed at this meeting probably represent some of the remnants of associations that are just now dissolving into the field and becoming moving g ...
... internal motions are relatively small, and they then become moving groups or streams. The weak-lined T Tauri stars found by X-ray observations that were discussed at this meeting probably represent some of the remnants of associations that are just now dissolving into the field and becoming moving g ...
Слайд 1 - Tuorla Observatory
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
The Milky Way Galaxy
... spheroid. A massive black hole marks the center of the Galaxy. The (Our) Sun sits far out in the disc and in visible light. Our view of the Galaxy is limited by interstellar dust. Consequently, the large-scale structure of the Galaxy must be inferred from observations made at infrared and radio wave ...
... spheroid. A massive black hole marks the center of the Galaxy. The (Our) Sun sits far out in the disc and in visible light. Our view of the Galaxy is limited by interstellar dust. Consequently, the large-scale structure of the Galaxy must be inferred from observations made at infrared and radio wave ...
Small galaxies are growing smaller
... 16–20 Mpc away. Studies of Virgo by Allan Sandage, Bruno Binggeli and Gustav Tammann, and of Fornax by Sandage and Harry Ferguson, revealed many low surface brightness objects looking just like Local Group dwarf ellipticals (though some contain central nuclei), dwarf irregulars and even dwarf sphero ...
... 16–20 Mpc away. Studies of Virgo by Allan Sandage, Bruno Binggeli and Gustav Tammann, and of Fornax by Sandage and Harry Ferguson, revealed many low surface brightness objects looking just like Local Group dwarf ellipticals (though some contain central nuclei), dwarf irregulars and even dwarf sphero ...
100 Binocular Deep Sky Objects
... look? My answer to those questions is, You can look at nearly everything, but sometimes you just need a different way to look at things. This Binocular Observing List has many Deep Sky Objects, all listed in groups, sometimes 3 or 4 in a group, but usually 2 objects in a group. Seeing DSOs in groups ...
... look? My answer to those questions is, You can look at nearly everything, but sometimes you just need a different way to look at things. This Binocular Observing List has many Deep Sky Objects, all listed in groups, sometimes 3 or 4 in a group, but usually 2 objects in a group. Seeing DSOs in groups ...
Chapter 16
... 1. A globular cluster is a spherical group of up to hundreds of thousands of stars, found primarily in the halo of the Galaxy. 2. The average separation of stars near the center of a globular cluster is 0.5 light-year. Stars in the region of the Sun average 4–5 light-years apart. 3. Shapley attempte ...
... 1. A globular cluster is a spherical group of up to hundreds of thousands of stars, found primarily in the halo of the Galaxy. 2. The average separation of stars near the center of a globular cluster is 0.5 light-year. Stars in the region of the Sun average 4–5 light-years apart. 3. Shapley attempte ...
The Milky Way and other Galaxies
... Measuring the Mass of the Black Hole in the Center of the Milky Way By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to be ~ 4 million solar masses. ...
... Measuring the Mass of the Black Hole in the Center of the Milky Way By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to be ~ 4 million solar masses. ...
Scorpius: The Scorpion Σκορπιος Amber Perrine Physics 1040 MWF
... seven beautiful sisters, the daughters of Atlas and Pleione. Orion immediately fell in love with all seven sisters and began to pursue them. However, the sisters were terrified of him and cried out to Zeus to save them. Zeus heard their pleas and helped them first by turning them into doves so they ...
... seven beautiful sisters, the daughters of Atlas and Pleione. Orion immediately fell in love with all seven sisters and began to pursue them. However, the sisters were terrified of him and cried out to Zeus to save them. Zeus heard their pleas and helped them first by turning them into doves so they ...
Sample Exam for 3 rd Astro Exam
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
Galaxies - Mike Brotherton
... Measuring the Mass of the Black Hole in the Center of the Milky Way By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to be ~ 2.6 million solar masses. ...
... Measuring the Mass of the Black Hole in the Center of the Milky Way By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to be ~ 2.6 million solar masses. ...
The Evolution of Galaxy - Tufts Institute of Cosmology
... after a merger. The outline of this cluster is perfectly smooth, and its temperature is nearly uniform, indicating that the cluster has assimilated all its groups and settled into equilibrium. The exception is the cool region at the very center. The lower temperatures occur because gas at the center ...
... after a merger. The outline of this cluster is perfectly smooth, and its temperature is nearly uniform, indicating that the cluster has assimilated all its groups and settled into equilibrium. The exception is the cool region at the very center. The lower temperatures occur because gas at the center ...
instructor notes stellar evolution, star clusters
... The effect shows up in the H-R diagrams for young clusters as a lower main-sequence turn-on point. Many, but not all, pre-main-sequence stars are still associated with the material from which they formed. Often such stars are found to be losing mass and to have emission lines in their spectra origi ...
... The effect shows up in the H-R diagrams for young clusters as a lower main-sequence turn-on point. Many, but not all, pre-main-sequence stars are still associated with the material from which they formed. Often such stars are found to be losing mass and to have emission lines in their spectra origi ...
instructor notes stellar evolution, star clusters
... The effect shows up in the H-R diagrams for young clusters as a lower main-sequence turn-on point. Many, but not all, pre-main-sequence stars are still associated with the material from which they formed. Often such stars are found to be losing mass and to have emission lines in their spectra origi ...
... The effect shows up in the H-R diagrams for young clusters as a lower main-sequence turn-on point. Many, but not all, pre-main-sequence stars are still associated with the material from which they formed. Often such stars are found to be losing mass and to have emission lines in their spectra origi ...
Globular Clusters
... H more and more slowly with decreasing mass), the TO is actually the ‘stellar clock’. Turning to the isochrones, since less massive stars are still in the MS phase, while more massive ones are in more advanced evolutionary stages, the upper MS becomes more and more depleted with increasing age, whil ...
... H more and more slowly with decreasing mass), the TO is actually the ‘stellar clock’. Turning to the isochrones, since less massive stars are still in the MS phase, while more massive ones are in more advanced evolutionary stages, the upper MS becomes more and more depleted with increasing age, whil ...
PH607lec08
... Can define a Hubble length: c / H0 ~ 4000 Mpc at which this expression for the recession velocity extrapolates to the speed of light - more detailed relativistic treatment is needed for distances of this order. Can also define a Hubble time: 1 / H0 ~ 1010 years …this is to order of magnitude the age ...
... Can define a Hubble length: c / H0 ~ 4000 Mpc at which this expression for the recession velocity extrapolates to the speed of light - more detailed relativistic treatment is needed for distances of this order. Can also define a Hubble time: 1 / H0 ~ 1010 years …this is to order of magnitude the age ...
Manual - TUM
... index ; that is, the difference in magnitudes of a star in two different filters (e.g. B-V or V-R). It is the observational equivalent of a Hertzsprung-Russell diagram (HRD) 1 . On a HRD, absolute magnitude or luminosity is plotted increasing up the vertical axis and spectral type or temperature (re ...
... index ; that is, the difference in magnitudes of a star in two different filters (e.g. B-V or V-R). It is the observational equivalent of a Hertzsprung-Russell diagram (HRD) 1 . On a HRD, absolute magnitude or luminosity is plotted increasing up the vertical axis and spectral type or temperature (re ...
–1– 2. Milky Way We know a great deal, perhaps more than any
... reached the conclusion that the center of the MW is not at the solar position. Shapley ignored the effect of dust. So in order to explain Kapteyn’s star counts, he had to add a local over-density of stars. ...
... reached the conclusion that the center of the MW is not at the solar position. Shapley ignored the effect of dust. So in order to explain Kapteyn’s star counts, he had to add a local over-density of stars. ...
The Milky Way
... we see few stars beyond 2 kpc from SS in the thin disk, where the number of stars is much greater • Originally astronomers thought the Milky Way WAS the Whole Universe & SS central to it (because of visible light extinction by dust) • Location of Globular Clusters in halo implied center towards Sagi ...
... we see few stars beyond 2 kpc from SS in the thin disk, where the number of stars is much greater • Originally astronomers thought the Milky Way WAS the Whole Universe & SS central to it (because of visible light extinction by dust) • Location of Globular Clusters in halo implied center towards Sagi ...
30-1 - Fremont Peak Observatory Association
... course of 24 hours Polaris makes a 1° (1 degree) circle around the NCP. It is somewhat difficult to believe, but at the present time, Polaris is more than one Moon width from the NCP. In addition, Polaris is getting closer to the NCP. Polaris will be closest in the year 2102 AD, and at that time it ...
... course of 24 hours Polaris makes a 1° (1 degree) circle around the NCP. It is somewhat difficult to believe, but at the present time, Polaris is more than one Moon width from the NCP. In addition, Polaris is getting closer to the NCP. Polaris will be closest in the year 2102 AD, and at that time it ...
Color-Magnitude Diagram Lab Manual
... 1. Once you have finished collecting data for every star in your cluster, you can turn off the telescope by turning off the Telescope Control Panel. To open the Color-Magnitude Diagram analysis select Tools → HR Diagram Analysis from the top menu. This will load a blue CMD plot. To load your observa ...
... 1. Once you have finished collecting data for every star in your cluster, you can turn off the telescope by turning off the Telescope Control Panel. To open the Color-Magnitude Diagram analysis select Tools → HR Diagram Analysis from the top menu. This will load a blue CMD plot. To load your observa ...
Star Clusters - Caltech Astronomy
... embedded clusters. This newly identified class of object consists of groups of stars still deeply embedded in the nebulosity out of which they have just formed. They range from a few tenths of a parsec to about two parsces in diameter. They are found only through IR imaging surveys—it is important t ...
... embedded clusters. This newly identified class of object consists of groups of stars still deeply embedded in the nebulosity out of which they have just formed. They range from a few tenths of a parsec to about two parsces in diameter. They are found only through IR imaging surveys—it is important t ...
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.