A Spectroscopically Confirmed Excess of 24 micron Sources in a
... (log(LIR )[erg s−1 ]> 45) not found in galaxy clusters at z . 0.35; and 3) there is a strong trend of decreasing 24µm fraction with increasing galaxy density, i.e. an infrared-density relation, not observed in the cluster. These dramatic differences are surprising because the early-type fraction in ...
... (log(LIR )[erg s−1 ]> 45) not found in galaxy clusters at z . 0.35; and 3) there is a strong trend of decreasing 24µm fraction with increasing galaxy density, i.e. an infrared-density relation, not observed in the cluster. These dramatic differences are surprising because the early-type fraction in ...
The University of Sydney Page
... Very low mass stars (mass less than about 0.4 solar masses) are different in one important respect from heavier stars: their interiors are fully convective. The fused helium is stirred through the whole star, so it has the whole of its hydrogen mass to prolong its stay on the main sequence. Because ...
... Very low mass stars (mass less than about 0.4 solar masses) are different in one important respect from heavier stars: their interiors are fully convective. The fused helium is stirred through the whole star, so it has the whole of its hydrogen mass to prolong its stay on the main sequence. Because ...
Curriculum Vitae - Centre for Astrophysics and Supercomputing
... Total: 61 publications (of which 5 first-author) with a total of 1562 citations; h-index of 22; m-index of 3.1 (statistics from ADS). 1. Pacifici, Camilla, da Cunha, Elisabete, Charlot, Stéphane et al., On the importance of using appropriate spectral models to derive physical properties of galaxies ...
... Total: 61 publications (of which 5 first-author) with a total of 1562 citations; h-index of 22; m-index of 3.1 (statistics from ADS). 1. Pacifici, Camilla, da Cunha, Elisabete, Charlot, Stéphane et al., On the importance of using appropriate spectral models to derive physical properties of galaxies ...
the article as PDF - Project VS
... VV Cephei eclipsing binary systems offer the most detailed method of studying mass loss from cool supergiant stars. The long-period of VV Cephei gives it a unique place among eclipsing binaries, but 20.4 years between eclipses make it really hard for scientists to study the system. Such a long inter ...
... VV Cephei eclipsing binary systems offer the most detailed method of studying mass loss from cool supergiant stars. The long-period of VV Cephei gives it a unique place among eclipsing binaries, but 20.4 years between eclipses make it really hard for scientists to study the system. Such a long inter ...
THE MONTHLY SKY GUIDE, SIXTH EDITION
... Orion, which ranges a full magnitude (i.e. 2.5 times) between maximum and minimum intensity, taking many months or even years to go from one peak to the next. The variations in the light output of Betelgeuse are caused by changes in the actual size of the star. Although the variations of Betelgeuse ...
... Orion, which ranges a full magnitude (i.e. 2.5 times) between maximum and minimum intensity, taking many months or even years to go from one peak to the next. The variations in the light output of Betelgeuse are caused by changes in the actual size of the star. Although the variations of Betelgeuse ...
Institute for Astrophysical Research Seminar Series
... Are You Teaching if No One Is Learning? Impact of Astronomy Education Research on ASTRO 101 ...
... Are You Teaching if No One Is Learning? Impact of Astronomy Education Research on ASTRO 101 ...
10 Astrophysics (Option E)
... As people began to travel they would have noticed that the motion of these bodies depended on where they were. At the equator, the Sun’s path does not change very much from day to day, but close to the North and South Poles, the Sun doesn’t go down in the summer but describes a big circle in the sky ...
... As people began to travel they would have noticed that the motion of these bodies depended on where they were. At the equator, the Sun’s path does not change very much from day to day, but close to the North and South Poles, the Sun doesn’t go down in the summer but describes a big circle in the sky ...
Variable Stars – II. Pulsating stars
... • further cooling of the zone results in recombination of the ionized material, a sudden decrease in the opacity, a decrease in outward pressure, and the zone drops back. Thus, through a pulsation cycle, the partial ionization zone acts with any pulsation movement. In this case the star is unstable ...
... • further cooling of the zone results in recombination of the ionized material, a sudden decrease in the opacity, a decrease in outward pressure, and the zone drops back. Thus, through a pulsation cycle, the partial ionization zone acts with any pulsation movement. In this case the star is unstable ...
The Star-Galaxy Era of Big History in the Light of Universal
... matter, energy, etc.) is a universal characteristic. Any major evolutionary shift in biological and social systems is preceded by the concentration of certain forms, resources and conditions in certain niches and places. Thus, in the major system the common processes may proceed in their usual way, ...
... matter, energy, etc.) is a universal characteristic. Any major evolutionary shift in biological and social systems is preceded by the concentration of certain forms, resources and conditions in certain niches and places. Thus, in the major system the common processes may proceed in their usual way, ...
Introduction: The History and Technique of Stellar Classification
... Introduction: The History and Technique of Stellar Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in that century that astronomers were able to routinely examine t ...
... Introduction: The History and Technique of Stellar Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in that century that astronomers were able to routinely examine t ...
13.5 The HR Diagram By the early 1900s, astronomers had learned
... and 27% helium, with a trace of the heavier elements. Most have surface temperatures between about 3000 and 30,000 K and masses between about 0.1 and 30 M⊙. The HR diagram offers a simple, pictorial way to summarize stellar properties. Most stars lie along the main sequence, with hotter stars being ...
... and 27% helium, with a trace of the heavier elements. Most have surface temperatures between about 3000 and 30,000 K and masses between about 0.1 and 30 M⊙. The HR diagram offers a simple, pictorial way to summarize stellar properties. Most stars lie along the main sequence, with hotter stars being ...
The Norma cluster (ACO3627) – II. The near-infrared Ks
... tages. While star-forming regions are bright at optical wavelengths, making optical observations particularly sensitive to galaxies where star formation is taking place, the NIR is much less affected by short bursts of star formation and therefore a better indicator of galaxy mass (Andreon & Pelló ...
... tages. While star-forming regions are bright at optical wavelengths, making optical observations particularly sensitive to galaxies where star formation is taking place, the NIR is much less affected by short bursts of star formation and therefore a better indicator of galaxy mass (Andreon & Pelló ...
Chapter 12: Stars and Galaxies
... consisting of only one kind of atom The element helium is produced by fusion in the Sun’s core. ...
... consisting of only one kind of atom The element helium is produced by fusion in the Sun’s core. ...
Andromeda: Daughter of Cassiopeia Ἀνδρομέδη Kaitlyn Heaton
... The Andromeda Galaxy. (Shown in figure 2) is the most distant object visible to the naked eye. You can find this famous galaxy on the right side of Andromeda, about half-way up the constellation. [2] It is a spiral galaxy approximately 2.5 million light years distant. In the past, it was also referr ...
... The Andromeda Galaxy. (Shown in figure 2) is the most distant object visible to the naked eye. You can find this famous galaxy on the right side of Andromeda, about half-way up the constellation. [2] It is a spiral galaxy approximately 2.5 million light years distant. In the past, it was also referr ...
Starburst Galaxies - Beck-Shop
... over 100 solar masses (beyond which stars become unstable). By far the majority of stars though are at the low-mass end of this range – 80% have masses less than that of the Sun. The higher mass stars are thus few and far between, but their brightnesses are out of all proportion greater than those o ...
... over 100 solar masses (beyond which stars become unstable). By far the majority of stars though are at the low-mass end of this range – 80% have masses less than that of the Sun. The higher mass stars are thus few and far between, but their brightnesses are out of all proportion greater than those o ...
Perseid Watch at Weiser State Forest August 12
... in material ejected by a nova. Observations of Nova Centauri 2013 made using telescopes at ESO’s La Silla Observatory, and near Santiago in Chile, help to explain the mystery of why many young stars seem to have more of this chemical element than expected. This new finding fills in a long-missing pi ...
... in material ejected by a nova. Observations of Nova Centauri 2013 made using telescopes at ESO’s La Silla Observatory, and near Santiago in Chile, help to explain the mystery of why many young stars seem to have more of this chemical element than expected. This new finding fills in a long-missing pi ...
powerpoint - High Energy Physics at Wayne State
... Astronomy is a Time Machine When we observe a star that is 100 light-years distant, then the light took 100 years to reach us. We are seeing it as it was 100 years ago. The nearest galaxy is about a million light-years from Earth. We see it as it was 1 million years ago. The most distant objects ob ...
... Astronomy is a Time Machine When we observe a star that is 100 light-years distant, then the light took 100 years to reach us. We are seeing it as it was 100 years ago. The nearest galaxy is about a million light-years from Earth. We see it as it was 1 million years ago. The most distant objects ob ...
copyright 2002 scientific american, inc.
... of the bursts. They occur isotropically— that is, they are spread evenly over the entire sky. This finding cast doubt on the prevailing wisdom, which held that bursts came from sources within the Milky Way; if they did, the shape of our galaxy, or Earth’s off-center position within it, should have c ...
... of the bursts. They occur isotropically— that is, they are spread evenly over the entire sky. This finding cast doubt on the prevailing wisdom, which held that bursts came from sources within the Milky Way; if they did, the shape of our galaxy, or Earth’s off-center position within it, should have c ...
Article PDF - IOPscience
... between the Magellanic Clouds by Kobulnicky & Dickey (1999). The early-type stars observed in the Bridge could have formed in these cold clouds. These objects therefore need not have migrated from the main body of the SMC. Rolleston et al. (1999) have compared the abundances of three early-type star ...
... between the Magellanic Clouds by Kobulnicky & Dickey (1999). The early-type stars observed in the Bridge could have formed in these cold clouds. These objects therefore need not have migrated from the main body of the SMC. Rolleston et al. (1999) have compared the abundances of three early-type star ...
The High Resolution Camera CXC Newsletter
... search for time variability of the sources, we included 23 observations from November 1999 to February 2005 (adding about 250 ks exposure time). We detected 318 X-ray sources and created long term light curves for all of them. We classified sources as highly variable or outbursting (with subclasses ...
... search for time variability of the sources, we included 23 observations from November 1999 to February 2005 (adding about 250 ks exposure time). We detected 318 X-ray sources and created long term light curves for all of them. We classified sources as highly variable or outbursting (with subclasses ...
Cassiopeia Kelly Pearce
... Skiing Cluster, the Owl Cluster or the ET cluster, depending on how you perceive the cluster of stars (Starrynighteducation.com, 2010; Gater & Vamplew, 2010, p.88). It is located near the edge of the constellation boundary, bordering on Cepheus (Starry Night Enthusiast, 2010). NGC 457 is an open clu ...
... Skiing Cluster, the Owl Cluster or the ET cluster, depending on how you perceive the cluster of stars (Starrynighteducation.com, 2010; Gater & Vamplew, 2010, p.88). It is located near the edge of the constellation boundary, bordering on Cepheus (Starry Night Enthusiast, 2010). NGC 457 is an open clu ...
File
... (“NGC 772, an unbarred spiral galaxy in Aries”). Also found within the borders of Aries is a pair of galaxies, NGC 678 and NGC 680 (image # 4) both are apart of the group called NGC 691 both galaxies are located aproximetly ...
... (“NGC 772, an unbarred spiral galaxy in Aries”). Also found within the borders of Aries is a pair of galaxies, NGC 678 and NGC 680 (image # 4) both are apart of the group called NGC 691 both galaxies are located aproximetly ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.