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A radiogenic heating evolution model for cosmochemically Earth
... bubbles or jets produced during supernova explosions (Sneden et al., 2008). In contrast, 40K is created both during oxygen burning when lighter elements fuse in the cores of massive stars and s-process (slow-process) nucleosynthesis, and it has a different galactic accumulation history than the r-pr ...
... bubbles or jets produced during supernova explosions (Sneden et al., 2008). In contrast, 40K is created both during oxygen burning when lighter elements fuse in the cores of massive stars and s-process (slow-process) nucleosynthesis, and it has a different galactic accumulation history than the r-pr ...
Starburst Galaxies Encyclopedia of Astronomy & Astrophysics eaa.iop.org T Heckman
... From a purely empirical point of view, the causes of starbursts become increasingly clear for starbursts of greater and greater luminosity. The most luminous starbursts in the local universe are the so-called ‘ultra-luminous infrared galaxies’, which have bolometric luminosities of roughly 1012 L ( ...
... From a purely empirical point of view, the causes of starbursts become increasingly clear for starbursts of greater and greater luminosity. The most luminous starbursts in the local universe are the so-called ‘ultra-luminous infrared galaxies’, which have bolometric luminosities of roughly 1012 L ( ...
Document
... contiguous parcels of interstellar gas moving as rigid bodies with homogeneous kinematical and physical properties then several of these clouds are needed to account for the velocities measured around the sun. ...
... contiguous parcels of interstellar gas moving as rigid bodies with homogeneous kinematical and physical properties then several of these clouds are needed to account for the velocities measured around the sun. ...
Small star patterns for telescopes and binoculars Demelza Ramakers
... binoculars ore telescopes. Unfortunately it’s pretty hard to find information about these small asterisms on the internet, so that’s why I started to make my own list. Hopefully this list is also useful to others. I used a lot of resources making this list, like the internet, the Sky & Telescope, bo ...
... binoculars ore telescopes. Unfortunately it’s pretty hard to find information about these small asterisms on the internet, so that’s why I started to make my own list. Hopefully this list is also useful to others. I used a lot of resources making this list, like the internet, the Sky & Telescope, bo ...
White dwarf cooling sequences and cosmochronology
... 5. THE AGE OF THE GALACTIC DISK A common picture of the formation of the Milky Way is that spiral galaxies form as a consequence of the gas cooling inside a spinning dark matter halo. In a first stage, the gas collapses in a dynamical time scale that lasts for several hundred million years, leaving ...
... 5. THE AGE OF THE GALACTIC DISK A common picture of the formation of the Milky Way is that spiral galaxies form as a consequence of the gas cooling inside a spinning dark matter halo. In a first stage, the gas collapses in a dynamical time scale that lasts for several hundred million years, leaving ...
IAC_L2_thindisk
... Metal ejection from star-forming disk, enriches halo, returns gas to disk (maybe with extra entrained gas from halo). Believed to be essential part of understanding the massmetallicity relation enrichment of IGM … Recent observational work on winds driven by starbursts and AGNs at low-z (Sharp & Bla ...
... Metal ejection from star-forming disk, enriches halo, returns gas to disk (maybe with extra entrained gas from halo). Believed to be essential part of understanding the massmetallicity relation enrichment of IGM … Recent observational work on winds driven by starbursts and AGNs at low-z (Sharp & Bla ...
A Search for Exozodiacal Dust and Faint Companions near Sirius
... the circular masked regions. The symmetry planes of the model disks are inclined 30¡ from edge-on. The dust densities in these have been enhanced to more than 105 times solar levels, so they are marginally discernible from the residuals from the point-spread function (PSF) subtraction. We used these ...
... the circular masked regions. The symmetry planes of the model disks are inclined 30¡ from edge-on. The dust densities in these have been enhanced to more than 105 times solar levels, so they are marginally discernible from the residuals from the point-spread function (PSF) subtraction. We used these ...
Galactic Parameters from Masers with Trigonometric Parallaxes
... We revised the localization of the Perseus spiral arm and found its pitch angle equal to -5±1 deg. We obtained also components of the peculiar solar velocity with respect to the Local Standard of Rest, which are "non-perturbed" by the spiral density wave: (U,V,W)LSR = (7,12,7)+-(2,2,1) km/s. ...
... We revised the localization of the Perseus spiral arm and found its pitch angle equal to -5±1 deg. We obtained also components of the peculiar solar velocity with respect to the Local Standard of Rest, which are "non-perturbed" by the spiral density wave: (U,V,W)LSR = (7,12,7)+-(2,2,1) km/s. ...
There are 88 constellations in the sky around the Earth. 12 are the
... Noteable doubles are: Zeta Cancri, magnitudes 5.6 & 6.0 (A binary with separation 1 second of arc & a period of 60 years. Larger telescopes reveal it to be a multiple star.) and Iota Cancri, magnitudes 4.3 & 6.3 (Separation 31 seconds of arc) ...
... Noteable doubles are: Zeta Cancri, magnitudes 5.6 & 6.0 (A binary with separation 1 second of arc & a period of 60 years. Larger telescopes reveal it to be a multiple star.) and Iota Cancri, magnitudes 4.3 & 6.3 (Separation 31 seconds of arc) ...
A star`s life is a struggle between ______ wanting to crush it, and
... c) No, the core temperatures of low-mass stars are too low to fuse other nuclei to carbon, so it would be the heaviest element. d) No, heavy elements created at the cores of low-mass stars would be locked away for billions of years. e) No, fission reactions would break down all elements heavier t ...
... c) No, the core temperatures of low-mass stars are too low to fuse other nuclei to carbon, so it would be the heaviest element. d) No, heavy elements created at the cores of low-mass stars would be locked away for billions of years. e) No, fission reactions would break down all elements heavier t ...
Strongly suggested reading: The stellar halo of the Galaxy
... The stellar halo is arguably the component that contains the most useful information about the evolutionary history of the Galaxy. This is because the most metal-poor stars in the Galaxy and possibly some of the oldest ones are found here. It therefore provides us with a picture of the Milky Way in ...
... The stellar halo is arguably the component that contains the most useful information about the evolutionary history of the Galaxy. This is because the most metal-poor stars in the Galaxy and possibly some of the oldest ones are found here. It therefore provides us with a picture of the Milky Way in ...
Spectral Line VLBI - Australia Telescope National Facility
... Properties of a Maser • The maser components are extremely small (mas) and narrow (fractions of a km/s) Measure position and velocity of components with great accuracy ...
... Properties of a Maser • The maser components are extremely small (mas) and narrow (fractions of a km/s) Measure position and velocity of components with great accuracy ...
StellarManual
... A policeman’s radar gun employs the Doppler effect to determine how fast a car may be traveling. The Doppler effect is only applicable for motions either towards or away from an observer and object, thus: The red car will receive the ticket as it is moving towards the police car. Suggestions: Recomm ...
... A policeman’s radar gun employs the Doppler effect to determine how fast a car may be traveling. The Doppler effect is only applicable for motions either towards or away from an observer and object, thus: The red car will receive the ticket as it is moving towards the police car. Suggestions: Recomm ...
The Evolution of Molecular Clouds
... first possibility, i.e. the building of large clouds from smaller ones by random collisions and coalescence, predicts formation times of at least 100 Myr for giant molecular clouds, and therefore probably cannot be the primary formation mechanism because this is longer than the cloud formation times ...
... first possibility, i.e. the building of large clouds from smaller ones by random collisions and coalescence, predicts formation times of at least 100 Myr for giant molecular clouds, and therefore probably cannot be the primary formation mechanism because this is longer than the cloud formation times ...
Galaxy Spiral Arms
... Keplerian calculations are the absolute starting point, and then they find various ways, such as there being an extremely massive but invisible halo of dark matter surrounding the Galaxy, to explain the observed data. Since this is the case, essentially all Papers start off by assuming either of two ...
... Keplerian calculations are the absolute starting point, and then they find various ways, such as there being an extremely massive but invisible halo of dark matter surrounding the Galaxy, to explain the observed data. Since this is the case, essentially all Papers start off by assuming either of two ...
Chapter 12: The Life Cycle of Stars (contʼd)
... • the period of a massive star's life when carbon, nitrogen, and oxygen are fusing in different shells outside the core • a type of hydrogen fusion that uses carbon, nitrogen, and oxygen atoms as catalysts • the process by which helium is fused into carbon, nitrogen, and oxygen • the perio ...
... • the period of a massive star's life when carbon, nitrogen, and oxygen are fusing in different shells outside the core • a type of hydrogen fusion that uses carbon, nitrogen, and oxygen atoms as catalysts • the process by which helium is fused into carbon, nitrogen, and oxygen • the perio ...
It is now recognized that the vast majority of ellipticals are of
... • Only a few E galaxies actually have flat luminosity profiles at small radii; instead, the profiles rise inward to the last measured point. • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to counter-rotate with respect to the r ...
... • Only a few E galaxies actually have flat luminosity profiles at small radii; instead, the profiles rise inward to the last measured point. • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to counter-rotate with respect to the r ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.