The Sun and the Stars
... of elevations (range of air masses) – derive extinction in magnitudes per unit air mass m(l )- m0 (l ) = -2.5log(e-t ( l ) ) m0 ( ) m( ) 1.086 ( ) ...
... of elevations (range of air masses) – derive extinction in magnitudes per unit air mass m(l )- m0 (l ) = -2.5log(e-t ( l ) ) m0 ( ) m( ) 1.086 ( ) ...
Quasars- The Brightest Black Holes
... more and more quasars to the present day – hundreds of thousands of these objects are now known. They litter the Universe; the most distant yet discovered is so far away that the time it takes its light to reach us means that we are seeing it as it was when the Universe was just 770 million years ol ...
... more and more quasars to the present day – hundreds of thousands of these objects are now known. They litter the Universe; the most distant yet discovered is so far away that the time it takes its light to reach us means that we are seeing it as it was when the Universe was just 770 million years ol ...
The University of Sydney Page
... Very low mass stars 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 ma ...
... Very low mass stars 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 ma ...
ph512-11-lec5
... galaxiIn an ideal world, one would like to have a selection of background point sources like quasars as reference points. However, given the small size of first generation CCD's the probability of having even one quasar in the field of view is extremely smaespositional accuracy. This level of precis ...
... galaxiIn an ideal world, one would like to have a selection of background point sources like quasars as reference points. However, given the small size of first generation CCD's the probability of having even one quasar in the field of view is extremely smaespositional accuracy. This level of precis ...
Astrophysics - Part 2
... Classification by temperature, black body radiation Stefan’s law and Wien’s displacement law.General shape of black body curves, experimental verification is not required. Use of Wien’s displacement law to estimate black-body temperature of sources λmaxT = constant = 2.9 × 10-3 mK. Inverse square la ...
... Classification by temperature, black body radiation Stefan’s law and Wien’s displacement law.General shape of black body curves, experimental verification is not required. Use of Wien’s displacement law to estimate black-body temperature of sources λmaxT = constant = 2.9 × 10-3 mK. Inverse square la ...
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... Outline Overview of Black Holes The Stellar Disruption Event The Flare The Stellar Wind Core Remnants ...
... Outline Overview of Black Holes The Stellar Disruption Event The Flare The Stellar Wind Core Remnants ...
White dwarf with almost pure oxygen atmosphere
... the core pushing the lighter ones, such as helium provide a critical link to some types of supernovae discovered over the past decade. As relatively Image of Sirius A and Sirius B taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the l ...
... the core pushing the lighter ones, such as helium provide a critical link to some types of supernovae discovered over the past decade. As relatively Image of Sirius A and Sirius B taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the l ...
On the Cosmic Nuclear Cycle and the Similarity of Nuclei and Stars
... stars were not made one-at-a-time in SN explosions but were more abundantly made in higher energy fragmentation events that produced our galaxy, probably in a high density region associated with active galactic nuclei (AGN), quasars, or massive neutron stars. The origin of these high-density, energe ...
... stars were not made one-at-a-time in SN explosions but were more abundantly made in higher energy fragmentation events that produced our galaxy, probably in a high density region associated with active galactic nuclei (AGN), quasars, or massive neutron stars. The origin of these high-density, energe ...
Chemistry
... each element produces a unique bright-line spectrum or pattern, spectroscopy is a valuable branch of science for determining what elements are present. The composition of stars and other objects in outer space is determined using this technique of line spectra analysis. Unlike gases, heated solids p ...
... each element produces a unique bright-line spectrum or pattern, spectroscopy is a valuable branch of science for determining what elements are present. The composition of stars and other objects in outer space is determined using this technique of line spectra analysis. Unlike gases, heated solids p ...
The Sun
... on its mass. – It takes about 10 billion years for a star with the mass of the Sun to convert all of the hydrogen in its core into helium. – When the hydrogen in its core is gone, a star has a helium center and outer layers made of hydrogen-dominated gas. – Some hydrogen continues to react in a thin ...
... on its mass. – It takes about 10 billion years for a star with the mass of the Sun to convert all of the hydrogen in its core into helium. – When the hydrogen in its core is gone, a star has a helium center and outer layers made of hydrogen-dominated gas. – Some hydrogen continues to react in a thin ...
Characteristics of Stars
... they imagined that groups of stars formed pictures of people or animals. Today, we call these imaginary patterns of stars constellations. Astronomers classify stars according to their physical characteristics. Characteristics used to classify stars include color, temperature, size, composition, and ...
... they imagined that groups of stars formed pictures of people or animals. Today, we call these imaginary patterns of stars constellations. Astronomers classify stars according to their physical characteristics. Characteristics used to classify stars include color, temperature, size, composition, and ...
Galaxies * Island universes
... mass ends up in the center as a black hole. A million solar masses or more! • Mass infall is high when galaxy is young, so bright accretion disk can overwhelm the light from the rest of the galaxy and a Quasar may even result. Up to 1 solar mass/year infall. • Later, as the galaxy ages, the stuff th ...
... mass ends up in the center as a black hole. A million solar masses or more! • Mass infall is high when galaxy is young, so bright accretion disk can overwhelm the light from the rest of the galaxy and a Quasar may even result. Up to 1 solar mass/year infall. • Later, as the galaxy ages, the stuff th ...
A New Variable Star in Perseus
... The secondary minima are shown in Figure 6 and Figure 7. Using this two minima, the duration of the flat part of the secondary minimum is determined as 583 minutes. ...
... The secondary minima are shown in Figure 6 and Figure 7. Using this two minima, the duration of the flat part of the secondary minimum is determined as 583 minutes. ...
PPT Only - Harvard-Smithsonian Center for Astrophysics
... highlights the extreme depletion seen at high extinctions in C18O emission (Lada et al. 2001). The inset on the bottom right panel shows the extinction map derived from applying the NICER method applied to NTT near-infrared observations of the most extinguished portion of B68. The graph in the botto ...
... highlights the extreme depletion seen at high extinctions in C18O emission (Lada et al. 2001). The inset on the bottom right panel shows the extinction map derived from applying the NICER method applied to NTT near-infrared observations of the most extinguished portion of B68. The graph in the botto ...
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.