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... the brightest star is Regulus. It is a triple system of a relatively small blue star, an orange sunlike star and a red dwarf. ...
... the brightest star is Regulus. It is a triple system of a relatively small blue star, an orange sunlike star and a red dwarf. ...
The Jeans instability in smoothed particle hydrodynamics
... which evolves with time in step with h i so that e i (t)lh i (t) = K, where K is a constant of order unity. This is to ensure that the gravitational acceleration agrav and the hydrostatic acceleration ahy dro are softened/smoothed on the same scale. (v) Gravity is either kernel-softened or Plummer-s ...
... which evolves with time in step with h i so that e i (t)lh i (t) = K, where K is a constant of order unity. This is to ensure that the gravitational acceleration agrav and the hydrostatic acceleration ahy dro are softened/smoothed on the same scale. (v) Gravity is either kernel-softened or Plummer-s ...
astrocoursespring2012lec4
... By now we have studied and observed clusters within the disk of our galaxy and in our western sky in the Spring. These clusters are thousand or so light years away. They also are known to be in the active process of star formation. Now it is time to go beyond the disk of the Milky way to observe Glo ...
... By now we have studied and observed clusters within the disk of our galaxy and in our western sky in the Spring. These clusters are thousand or so light years away. They also are known to be in the active process of star formation. Now it is time to go beyond the disk of the Milky way to observe Glo ...
Is Draco II one of the faintest dwarf galaxies? First study from Keck
... of stars 2 and 10, which must have very similar stellar parameters as they are confirmed Dra II member stars with almost identical colours and magnitudes ((0.53,18.87) and (0.55,18.98)), implies that these two member stars have significantly different metallicities (a 4.5σ difference in the equivale ...
... of stars 2 and 10, which must have very similar stellar parameters as they are confirmed Dra II member stars with almost identical colours and magnitudes ((0.53,18.87) and (0.55,18.98)), implies that these two member stars have significantly different metallicities (a 4.5σ difference in the equivale ...
Review: How does a star`s mass determine its life story?
... • You could orbit a black hole just like any other object of the same mass. However, you’d see strange effects for an object falling toward the black hole: – Time would seem to run slowly for the object – Its light would be increasingly redshifted as it approached the black hole. – The object would ...
... • You could orbit a black hole just like any other object of the same mass. However, you’d see strange effects for an object falling toward the black hole: – Time would seem to run slowly for the object – Its light would be increasingly redshifted as it approached the black hole. – The object would ...
Shortв•`lived radioactivity in the early solar system: The Superв•`AGB
... require a local or stellar origin, which, however, is far from being understood. We present for the first time the abundances of several SLR up to 60Fe predicted from stars with initial mass in the range approximately 7–11 Mx. These stars evolve through core H, He, and C burning. After core C burning ...
... require a local or stellar origin, which, however, is far from being understood. We present for the first time the abundances of several SLR up to 60Fe predicted from stars with initial mass in the range approximately 7–11 Mx. These stars evolve through core H, He, and C burning. After core C burning ...
Hubble Science Briefing: The Real World: Black Hole Edition
... galaxy in X-rays. Where does all that energy come from? ...
... galaxy in X-rays. Where does all that energy come from? ...
2014 State Test
... A8. Is the ring-like structure physically significant or just an optical illusion, and why? A. Optical illusion; a thin shell of gas is less visible towards the center than at the edges B. Optical illusion; the object is rotating so that the center of the image seems empty C. Physically significant; ...
... A8. Is the ring-like structure physically significant or just an optical illusion, and why? A. Optical illusion; a thin shell of gas is less visible towards the center than at the edges B. Optical illusion; the object is rotating so that the center of the image seems empty C. Physically significant; ...
Presentazione di PowerPoint
... Ever since the discovery paper by Becklin et al. (1969), the object IRC +10 216 (CW Leo) has spurred much interest. We now know that it is a carbon star in an advanced stage of stellar evolution on the asymptotic giant branch (AGB), pulsating and surrounded by an optically thick dust shell and large ...
... Ever since the discovery paper by Becklin et al. (1969), the object IRC +10 216 (CW Leo) has spurred much interest. We now know that it is a carbon star in an advanced stage of stellar evolution on the asymptotic giant branch (AGB), pulsating and surrounded by an optically thick dust shell and large ...
Define the following terms in the space provided
... Stars are much larger than planets. Our Sun is over 100 times the radius of the Earth. There are stars some what smaller than the Sun and stars that are vastly larger than the Sun Star clusters come in two principle forms: open clusters and globular clusters. They may consist of several hundred to s ...
... Stars are much larger than planets. Our Sun is over 100 times the radius of the Earth. There are stars some what smaller than the Sun and stars that are vastly larger than the Sun Star clusters come in two principle forms: open clusters and globular clusters. They may consist of several hundred to s ...
Constraining the Bulk Properties of Dense Matter by Measuring
... The most massive observed neutron star also sets a quantitative upper limit to its central density, which then cannot be exceeded in any neutron star. As successively more massive neutron stars are observed, the limiting central density gets smaller. Approximately, the limit is ρmax ≤ 36ρs (M /Mmax ...
... The most massive observed neutron star also sets a quantitative upper limit to its central density, which then cannot be exceeded in any neutron star. As successively more massive neutron stars are observed, the limiting central density gets smaller. Approximately, the limit is ρmax ≤ 36ρs (M /Mmax ...
Studies of molecular clouds at the Galactic centre Roland Karlsson DECLINATION (B1950)
... build-up of the energy budget and the evolution of the various phenomena that are observed at different galactocentric radii. In barred spiral galaxies like the Galaxy, large scale transversal bars are suggested to pump material inwards such that the centre region is supplied with gas, dust and star ...
... build-up of the energy budget and the evolution of the various phenomena that are observed at different galactocentric radii. In barred spiral galaxies like the Galaxy, large scale transversal bars are suggested to pump material inwards such that the centre region is supplied with gas, dust and star ...
Core-Halo Age Gradients and Star Formation in the Orion Nebula
... While considerable insights have been gained regarding the formation of stars on small scales, the formation of rich stellar clusters dominated by OB stars is quite uncertain. Debate has waged for decades over the relative importance of rapid ‘top-down’ fragmentation or a slower ‘bottom-up’ process ...
... While considerable insights have been gained regarding the formation of stars on small scales, the formation of rich stellar clusters dominated by OB stars is quite uncertain. Debate has waged for decades over the relative importance of rapid ‘top-down’ fragmentation or a slower ‘bottom-up’ process ...
Cygnus X-1 poster (Massive Star Workshop)
... Cygnus X-1 is a luminous X-ray binary, hosting a 14.81 ± 0.98 M⊙ black hole (BH) and a 19.16 ± 1.90 M⊙ O supergiant star in a Keplerian orbit of 5.6 days (Orosz 2011). This system is a persistent X-ray source that emits in two states: low-hard or high-soft state. Although the supergiant is close to ...
... Cygnus X-1 is a luminous X-ray binary, hosting a 14.81 ± 0.98 M⊙ black hole (BH) and a 19.16 ± 1.90 M⊙ O supergiant star in a Keplerian orbit of 5.6 days (Orosz 2011). This system is a persistent X-ray source that emits in two states: low-hard or high-soft state. Although the supergiant is close to ...
Stellar Evolution and the fate of the Solar System
... YUV420 codec decompressor are needed to see this picture. ...
... YUV420 codec decompressor are needed to see this picture. ...
The Galactic evolution of phosphorus
... planets” it cannot be excluded that they harbour undetected planets. We note, however, that all of the stars “without planets” in our sample, except for HD 215648 and HD 207978 have several high precision radial velocity points measured with the HARPS spectrograph at the ESO 3.6 m telescope. Given t ...
... planets” it cannot be excluded that they harbour undetected planets. We note, however, that all of the stars “without planets” in our sample, except for HD 215648 and HD 207978 have several high precision radial velocity points measured with the HARPS spectrograph at the ESO 3.6 m telescope. Given t ...
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.