Our galaxy - School of Physics
... Shapley concluded that the Galaxy must extend far beyond the portion that had been mapped, and that the globular clusters must mark the true centre of the Galaxy. This suggested the Galaxy was much larger than we thought. ...
... Shapley concluded that the Galaxy must extend far beyond the portion that had been mapped, and that the globular clusters must mark the true centre of the Galaxy. This suggested the Galaxy was much larger than we thought. ...
There are 88 constellations in the sky around the Earth. 12 are the
... became a popular sport of kings and a necessity to keep their populations down. The lion is associated with the warrior goddess, Istar. Representations of the hero-king Gilgamesh often show him with a club in one hand and a lion in the other. The sickle shape of the constellation containing the bri ...
... became a popular sport of kings and a necessity to keep their populations down. The lion is associated with the warrior goddess, Istar. Representations of the hero-king Gilgamesh often show him with a club in one hand and a lion in the other. The sickle shape of the constellation containing the bri ...
Mnassa Report 2005 - (UCT)
... Dr Medupe visited Bamako and Timbuktu in Mali in January to work with translators on the Astronomy Manuscripts of Timbuktu. He also spent a month at the Department of Physics and Astronomy in Aarhus, Denmark in September to work on a research paper titled “Radial nonadiabatic eigenfunctions in A sta ...
... Dr Medupe visited Bamako and Timbuktu in Mali in January to work with translators on the Astronomy Manuscripts of Timbuktu. He also spent a month at the Department of Physics and Astronomy in Aarhus, Denmark in September to work on a research paper titled “Radial nonadiabatic eigenfunctions in A sta ...
Hertzsprung–Russell diagram - Wikipedia, the free encyclopedia
... An HR diagram showing many well known stars in the Milky Way stars are too distant for meaningful galaxy. parallaxes to have been measured before the advent of space astrometry, so no estimate of their absolute magnitude existed prior to that work. Russell's early (1913) versions of the diagram incl ...
... An HR diagram showing many well known stars in the Milky Way stars are too distant for meaningful galaxy. parallaxes to have been measured before the advent of space astrometry, so no estimate of their absolute magnitude existed prior to that work. Russell's early (1913) versions of the diagram incl ...
Data Provided:
... 1. A Cepheid variable in a nearby galaxy has a mean apparent magnitude in the V band of hmV i = 24.45 magnitudes, a period of P = 8 days, and suffers extinction of AV = 0.35 magnitudes due to foreground dust in the Milky Way. If Cepheid variables follow a V-band period-luminosity relation of form hM ...
... 1. A Cepheid variable in a nearby galaxy has a mean apparent magnitude in the V band of hmV i = 24.45 magnitudes, a period of P = 8 days, and suffers extinction of AV = 0.35 magnitudes due to foreground dust in the Milky Way. If Cepheid variables follow a V-band period-luminosity relation of form hM ...
here. - SUNY Oswego
... Why are SMC photospheric densities greater than that for the LMC/Galactic models - and what are the observational implications of this? Period-Color/Amplitude-Color relations. Relation to metallicity: Galactic/LMC/SMC Cepheids have different metallicities which changes their L/M ratios and Teff. Thi ...
... Why are SMC photospheric densities greater than that for the LMC/Galactic models - and what are the observational implications of this? Period-Color/Amplitude-Color relations. Relation to metallicity: Galactic/LMC/SMC Cepheids have different metallicities which changes their L/M ratios and Teff. Thi ...
University of Groningen Colliding winds in Wolf-Rayet
... where the lower mass stars (< 40 M ) undergo the red supergiant (RSG) phase and the higher ones (> 40 M ) undergo the luminous blue variable (LBV) phase. The Wolf-Rayet phase lasts for about 5 105 years, and the resulting supernovae are of Type Ib and Ic. Since the first detection by Wolf and Ra ...
... where the lower mass stars (< 40 M ) undergo the red supergiant (RSG) phase and the higher ones (> 40 M ) undergo the luminous blue variable (LBV) phase. The Wolf-Rayet phase lasts for about 5 105 years, and the resulting supernovae are of Type Ib and Ic. Since the first detection by Wolf and Ra ...
ppt - IASF Milano
... •Improve significantly the constraints on the c-M relation by analyzing a wider mass range with many more systems, in particular obtaining accurate mass constraints on relaxed systems with 1012 ≤ M ≤ 1014 Msun •Our recent study of the mass profiles of 7 early type galaxies with Chandra indicates c-M ...
... •Improve significantly the constraints on the c-M relation by analyzing a wider mass range with many more systems, in particular obtaining accurate mass constraints on relaxed systems with 1012 ≤ M ≤ 1014 Msun •Our recent study of the mass profiles of 7 early type galaxies with Chandra indicates c-M ...
Abundances of RGB stars in NGC 6752 Grundahl
... The primordial scenario, and variations on it, has been proposed and discussed several times before in the literature (see for example Cottrell & Da Costa 1981, and Cannon et al. 1998). The small star–to–star scatter in the iron peak elements (as observed in this work) indicates that the contributio ...
... The primordial scenario, and variations on it, has been proposed and discussed several times before in the literature (see for example Cottrell & Da Costa 1981, and Cannon et al. 1998). The small star–to–star scatter in the iron peak elements (as observed in this work) indicates that the contributio ...
The James Webb Space Telescope - HubbleSOURCE
... Hubble Space Telescope • HST has made and continues to make huge impact on astronomy and the public – Cosmic distance scale – Accelerating universe & dark energy – Supermassive BH in Galaxy centers ...
... Hubble Space Telescope • HST has made and continues to make huge impact on astronomy and the public – Cosmic distance scale – Accelerating universe & dark energy – Supermassive BH in Galaxy centers ...
Examining the M67 Classification as an Open Cluster
... Usually classified as an open cluster, the dense stellar cluster M67 in Cancer is one of the oldest known open clusters in our Galaxy with an age tclust of 3.5 - 4.5 Gyr, that is, close to the age of the sun [1-3]. In the present paper we adopt the value tclust = 4 Gyr [4,5]. It is important to note ...
... Usually classified as an open cluster, the dense stellar cluster M67 in Cancer is one of the oldest known open clusters in our Galaxy with an age tclust of 3.5 - 4.5 Gyr, that is, close to the age of the sun [1-3]. In the present paper we adopt the value tclust = 4 Gyr [4,5]. It is important to note ...
Brightness and Flux Density
... definitions to describe the strength of radiation and how it varies with distance between the source and the observer. The concepts of brightness and flux density are deceptively simple, but they regularly trip up experienced astronomers. It is very important to understand them clearly because they ...
... definitions to describe the strength of radiation and how it varies with distance between the source and the observer. The concepts of brightness and flux density are deceptively simple, but they regularly trip up experienced astronomers. It is very important to understand them clearly because they ...
What powers luminous infrared galaxies?
... rectangles in Fig. 2) all LBol /LLyc ratios in the luminous IRAS galaxies are reduced significantly, but for UGC 5101, NGC 6240, and Arp 220 still not sufficiently to fit normal starburst models. The new ISO data now suggest that observations at midand far-infrared wavelengths are required to penetr ...
... rectangles in Fig. 2) all LBol /LLyc ratios in the luminous IRAS galaxies are reduced significantly, but for UGC 5101, NGC 6240, and Arp 220 still not sufficiently to fit normal starburst models. The new ISO data now suggest that observations at midand far-infrared wavelengths are required to penetr ...
Ground-Based Astrometry 2010-2020
... optical filters on 0.5′′ pixels to magnitude 21 (single visit). A shorter-integration survey is planned to sample stars with magnitudes 9–16. • URAT (USNO Robotic Astrometry Telescope): Following the successful USNO CCD Astrograph Catalog (UCAC), URAT (Zacharias 2008) will employ telescopes in both ...
... optical filters on 0.5′′ pixels to magnitude 21 (single visit). A shorter-integration survey is planned to sample stars with magnitudes 9–16. • URAT (USNO Robotic Astrometry Telescope): Following the successful USNO CCD Astrograph Catalog (UCAC), URAT (Zacharias 2008) will employ telescopes in both ...
Document
... Density profile decides how deep the pulsations penetrate in the star. (Deeper the penetration ...
... Density profile decides how deep the pulsations penetrate in the star. (Deeper the penetration ...
Section 6 The Expanding Universe The Doppler Effect
... The name Hubble is most famous now for the telescope in orbit around the Earth. But where does the name come from? Edwin Hubble was one of the greats of 20th century astronomy. (See the science timeline section to find out more of his story.) At the end of World War I the number of known galaxies in ...
... The name Hubble is most famous now for the telescope in orbit around the Earth. But where does the name come from? Edwin Hubble was one of the greats of 20th century astronomy. (See the science timeline section to find out more of his story.) At the end of World War I the number of known galaxies in ...
Document
... • There are several good candidates • But it is necessary to find the black hole ITSELF! 3. Exotic emission mechanisms • As all other exotics: interesting, but not very probable • If it works, then GLAST will show us isolated BHs 4. Runaway stars • A rare case to make even rough estimates of paramet ...
... • There are several good candidates • But it is necessary to find the black hole ITSELF! 3. Exotic emission mechanisms • As all other exotics: interesting, but not very probable • If it works, then GLAST will show us isolated BHs 4. Runaway stars • A rare case to make even rough estimates of paramet ...
PowerPoint
... • Nearest star is 4 x 1013 km away (more than 5000x distance to Pluto) or around 4 light years. The Alpha Centauri triple system– the closest being Proxima. • Walking time: 1 billion years • Fastest space probes (Voyagers 1 & 2, Pioneers 10 & 11) – 60,000 years at about 3.6 AU/year. ...
... • Nearest star is 4 x 1013 km away (more than 5000x distance to Pluto) or around 4 light years. The Alpha Centauri triple system– the closest being Proxima. • Walking time: 1 billion years • Fastest space probes (Voyagers 1 & 2, Pioneers 10 & 11) – 60,000 years at about 3.6 AU/year. ...
GAIA A Stereoscopic Census of our Galaxy - Cosmos
... distances to 1% for ~11 million stars to 2.5 kpc distances to 10% for ~150 million stars to 25 kpc rare stellar types and rapid evolutionary phases in large numbers parallax calibration of all distance indicators e.g., Cepheids and RR Lyrae to LMC/SMC ...
... distances to 1% for ~11 million stars to 2.5 kpc distances to 10% for ~150 million stars to 25 kpc rare stellar types and rapid evolutionary phases in large numbers parallax calibration of all distance indicators e.g., Cepheids and RR Lyrae to LMC/SMC ...
Summer 2004 ISP 205: Visions of the Universe Professor: ER Capriotti Sample Questions
... D. gone into space E. rocks 72. Rocks on the Moon have been shown to have ages A. between 10 and 20 billion years. B. between 6 and 8 million years. C. of 3.5 billion years with no range in age. D. They have not been dated. E. between 2.5 and 4.6 billion years. 73. Most lunar craters were apparently ...
... D. gone into space E. rocks 72. Rocks on the Moon have been shown to have ages A. between 10 and 20 billion years. B. between 6 and 8 million years. C. of 3.5 billion years with no range in age. D. They have not been dated. E. between 2.5 and 4.6 billion years. 73. Most lunar craters were apparently ...
Article PDF - IOPscience
... noted: (i) the evolution of disk regions well contain the higher [FeyH] data, with the inner region showing abundances even higher than observed, and (ii) the evolutionary history of the different regions can well reproduce the spread in the observations. In considering the other elements for which ...
... noted: (i) the evolution of disk regions well contain the higher [FeyH] data, with the inner region showing abundances even higher than observed, and (ii) the evolutionary history of the different regions can well reproduce the spread in the observations. In considering the other elements for which ...
A search for debris disks in the Herschel
... within the main sequence locus (see Fig. 2). Within this sample we expect considerable contamination from dust obscured QSOs or unresolved galaxies whose optical colours are reddened into the main sequence locus (Ivezić et al. 2002). Indeed, the sample have a median r-band magnitude of 19.8, fainte ...
... within the main sequence locus (see Fig. 2). Within this sample we expect considerable contamination from dust obscured QSOs or unresolved galaxies whose optical colours are reddened into the main sequence locus (Ivezić et al. 2002). Indeed, the sample have a median r-band magnitude of 19.8, fainte ...
Quasars- The Brightest Black Holes
... Universe, there is a direct relationship (established in the late 1920’s as Hubble’s law) between the speed with which a cosmic object is receding and its distance away from us – the further objects move away faster. 3C273’s redshift indicated that this ‘star’ was two and a half billion light-years ...
... Universe, there is a direct relationship (established in the late 1920’s as Hubble’s law) between the speed with which a cosmic object is receding and its distance away from us – the further objects move away faster. 3C273’s redshift indicated that this ‘star’ was two and a half billion light-years ...
The Mass of Jupiter Student Guide
... which will be better for tracking the motion of Jupiter through the sky. 9. The “/” and “\” keys can be used to zoom in and out from the object of focus. Zoom in until you can see the Galilean satellites of Jupiter: Ganymede, Io, Europa, and Callisto. (One of more of these satellites may be obscured ...
... which will be better for tracking the motion of Jupiter through the sky. 9. The “/” and “\” keys can be used to zoom in and out from the object of focus. Zoom in until you can see the Galilean satellites of Jupiter: Ganymede, Io, Europa, and Callisto. (One of more of these satellites may be obscured ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.