Carbon-enhanced metal-poor stars: a window on AGB
... Many of the carbon-enhanced metal-poor (CEMP) stars that we observe in the Galactic halo are found in binary systems and show enhanced abundances of elements produced by the slow neutron-capture process (s-elements). The origin of the peculiar chemical abundances of these CEMP-s stars is believed to ...
... Many of the carbon-enhanced metal-poor (CEMP) stars that we observe in the Galactic halo are found in binary systems and show enhanced abundances of elements produced by the slow neutron-capture process (s-elements). The origin of the peculiar chemical abundances of these CEMP-s stars is believed to ...
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... ON COSMOLOGICAL STRUCTURE IN THE EARLY UNIVERSE Brian William O’Shea, Ph.D. Department of Physics University of Illinois at Urbana-Champaign, 2005 Michael L. Norman, Advisor ...
... ON COSMOLOGICAL STRUCTURE IN THE EARLY UNIVERSE Brian William O’Shea, Ph.D. Department of Physics University of Illinois at Urbana-Champaign, 2005 Michael L. Norman, Advisor ...
Full-Text PDF
... down in less than a hundred seconds. It is usually argued that the balance of magnetic pressure with ram pressure from the disk can give an estimate of the possible magnetic flux accumulated around the central object. This argument is reasonable for accreting black hole systems such as AGNs and X-ra ...
... down in less than a hundred seconds. It is usually argued that the balance of magnetic pressure with ram pressure from the disk can give an estimate of the possible magnetic flux accumulated around the central object. This argument is reasonable for accreting black hole systems such as AGNs and X-ra ...
Galaxies Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015
... Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015 ...
... Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015 ...
Catalogs of Hot White Dwarfs in the Milky Way from GALEX`s
... asymptotic giant branch (AGB) and planetary nebula (PN) phases, in which they shed much of their mass. The ejected material enriches the interstellar medium (ISM) with newly synthesized nuclear products (mainly He, C, N, and possibly O), to different extents, depending on the initial stellar mass an ...
... asymptotic giant branch (AGB) and planetary nebula (PN) phases, in which they shed much of their mass. The ejected material enriches the interstellar medium (ISM) with newly synthesized nuclear products (mainly He, C, N, and possibly O), to different extents, depending on the initial stellar mass an ...
9 The Clearing of Protoplanetary Disks and of the Protosolar Nebula
... for about 99% of the disk’s initial mass while dust, in the form of submicronsized grains, only for about 1%. In the process of forming planets circumstellar disks disperse: sub-micron dust grains collide and stick together to form larger aggregates; gas accretes onto the star, onto the cores of gia ...
... for about 99% of the disk’s initial mass while dust, in the form of submicronsized grains, only for about 1%. In the process of forming planets circumstellar disks disperse: sub-micron dust grains collide and stick together to form larger aggregates; gas accretes onto the star, onto the cores of gia ...
VLT identifications in the Chandra/XMM
... (Lehmann et al., 2001). If an AGN is much fainter than its host galaxy it is not possible to detect it optically. Many of the counterparts of the faint X-ray sources detected by Chandra and XMM-Newton show optical spectra dominated by their host galaxy and only a minority have clear indications of a ...
... (Lehmann et al., 2001). If an AGN is much fainter than its host galaxy it is not possible to detect it optically. Many of the counterparts of the faint X-ray sources detected by Chandra and XMM-Newton show optical spectra dominated by their host galaxy and only a minority have clear indications of a ...
Lecture 1: Astrophysics
... rare events: knowledge is limited, and will usually not occur nearby; e.g. SNe best way to add knowledge is to use new wavelength domains, e.g. radio, X-ray statistical arguments vital! more so than in many areas of lab physics, e.g. γ -ray bursts Lecture 1: Astrophysics ...
... rare events: knowledge is limited, and will usually not occur nearby; e.g. SNe best way to add knowledge is to use new wavelength domains, e.g. radio, X-ray statistical arguments vital! more so than in many areas of lab physics, e.g. γ -ray bursts Lecture 1: Astrophysics ...
Detection of the Stochastic Background of nHz Gravitational Radiation from Massive Black
... • Sagittarius A* – Black Hole with mass of 4 million Suns (Ms) in the center of our Milky Way galaxy. • NGC 4258 – mass of 30 million Ms, similar to many nearby galaxies. • Quasars and “Active” Galaxies – jets formed by poorly understood processes; masses up to a few billion Ms. 2003 Summer School, ...
... • Sagittarius A* – Black Hole with mass of 4 million Suns (Ms) in the center of our Milky Way galaxy. • NGC 4258 – mass of 30 million Ms, similar to many nearby galaxies. • Quasars and “Active” Galaxies – jets formed by poorly understood processes; masses up to a few billion Ms. 2003 Summer School, ...
1 The Hubble Story (10:56)
... Although the existence of black holes has been hypothesized for more than 200 years, a central tenet of the theory is that a black hole will be impossible to observe directly. X-ray satellites had hinted that black holes existed, by detecting the emission of X-rays from superheated gas about to be s ...
... Although the existence of black holes has been hypothesized for more than 200 years, a central tenet of the theory is that a black hole will be impossible to observe directly. X-ray satellites had hinted that black holes existed, by detecting the emission of X-rays from superheated gas about to be s ...
Luminosity, Flux and Magnitudes Outline
... by the microscopic motions of particles. There is a continuum of energy levels associated with this motion. If the object is in thermal equilibrium then it can be characterized by a single quantity, it’s temperature. An object in thermal equilibrium emits energy at all wavelengths. ...
... by the microscopic motions of particles. There is a continuum of energy levels associated with this motion. If the object is in thermal equilibrium then it can be characterized by a single quantity, it’s temperature. An object in thermal equilibrium emits energy at all wavelengths. ...
The Celestial Sphere CHAPTER 1
... 2.17 (Note: Orbit can be downloaded from the companion web site at http://www.aw-bc.com/astrophysics.) (a) See Fig. S2.3. (b) See Fig. S2.3. (c) Figure S2.3 shows that the orbit of Mars is very close to a perfect circle, with the center of the circle slightly offset from the focal point of the ellip ...
... 2.17 (Note: Orbit can be downloaded from the companion web site at http://www.aw-bc.com/astrophysics.) (a) See Fig. S2.3. (b) See Fig. S2.3. (c) Figure S2.3 shows that the orbit of Mars is very close to a perfect circle, with the center of the circle slightly offset from the focal point of the ellip ...
Phase-resolved high-resolution spectrophotometry of the eclipsing
... raw images. Sky-subtraction was performed afterwards in the usual manner by fitting polynomials to CCD-columns above and below the region exposed to the target star. Next, the spatial coordinate of individual pixels along the slit had to be transformed to time or orbital phase. We defined start and ...
... raw images. Sky-subtraction was performed afterwards in the usual manner by fitting polynomials to CCD-columns above and below the region exposed to the target star. Next, the spatial coordinate of individual pixels along the slit had to be transformed to time or orbital phase. We defined start and ...
Simultaneous formation of solar system giant planets
... the final core masses of the four planets agreed very well with the present theoretical estimate. However, some important simplifications were assumed in that work. It is well known that planet formation, disk evolution and planetesimal migration occur on the same time scale. Consequently, a closer ...
... the final core masses of the four planets agreed very well with the present theoretical estimate. However, some important simplifications were assumed in that work. It is well known that planet formation, disk evolution and planetesimal migration occur on the same time scale. Consequently, a closer ...
CELESTIAL MANUAL:CELESTIAL MANUAL
... The Constellation display includes the positions of 1056 fixed stars with a brightness of the 4.8th magnitude or brighter, 169 major nebulae,galaxies and star clusters, constellation boundaries and the ecliptic and the celestial equator based on their positions for the year 2000.0. (Maximum magnitud ...
... The Constellation display includes the positions of 1056 fixed stars with a brightness of the 4.8th magnitude or brighter, 169 major nebulae,galaxies and star clusters, constellation boundaries and the ecliptic and the celestial equator based on their positions for the year 2000.0. (Maximum magnitud ...
Scale the Universe - Crystal Ball Science
... waves are longer, they are easily absorbed into molecules, heating them up, like our french fries at MacDonald's • The dust between the stars also gives off infrared energy Winter 2008 ...
... waves are longer, they are easily absorbed into molecules, heating them up, like our french fries at MacDonald's • The dust between the stars also gives off infrared energy Winter 2008 ...
Barger - Chandra X-Ray Observatory (CXC)
... extinction in the MIR & radio is small • People have tried to use combined MIR & radio selections, but to obtain a reliable upper limit on the possible population of X-ray undetected, obscured AGNs, a clean selection is needed • Here we use a pure microJansky radio survey selection in the HDF-N fiel ...
... extinction in the MIR & radio is small • People have tried to use combined MIR & radio selections, but to obtain a reliable upper limit on the possible population of X-ray undetected, obscured AGNs, a clean selection is needed • Here we use a pure microJansky radio survey selection in the HDF-N fiel ...
2 Justification and benefits in joining TMT
... advanced adaptive optics will revolutionise many fields in astronomy. TMT will directly image and probe the atmospheres of extrasolar planets; it will provide key insights into the nature of dark matter and dark energy, and shed light on how galaxies, stars, black holes and planets form and evolve. ...
... advanced adaptive optics will revolutionise many fields in astronomy. TMT will directly image and probe the atmospheres of extrasolar planets; it will provide key insights into the nature of dark matter and dark energy, and shed light on how galaxies, stars, black holes and planets form and evolve. ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.