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SherwoodWA_1973redux - Edinburgh Research Archive
... 1970; Gottesman and Davis, 1970) found that the HII regions and blue supergiants (in associations) lie within the ...
... 1970; Gottesman and Davis, 1970) found that the HII regions and blue supergiants (in associations) lie within the ...
Module 4.1 - The Scale of the Universe [slide 1] We now turn to
... cosmological model, specified by values of different, omegas, or little w as well, all distances and all times scale linearly with Hubble's constant. And thus its importance. So, the inverse of the Hubble constant is the characteristic time unit of cosmology. The Hubble time. Multiplied by the speed ...
... cosmological model, specified by values of different, omegas, or little w as well, all distances and all times scale linearly with Hubble's constant. And thus its importance. So, the inverse of the Hubble constant is the characteristic time unit of cosmology. The Hubble time. Multiplied by the speed ...
The connection between stellar activity cycles and magnetic field
... an instrumental role in advancing knowledge of stellar cycles via multi-decade chromospheric observations of solar-like stars (Wilson 1978; Baliunas et al. 1995; Metcalfe et al. 2013; Egeland et al. 2015). Further observational campaigns have also been directly inspired by the work done at the Mount ...
... an instrumental role in advancing knowledge of stellar cycles via multi-decade chromospheric observations of solar-like stars (Wilson 1978; Baliunas et al. 1995; Metcalfe et al. 2013; Egeland et al. 2015). Further observational campaigns have also been directly inspired by the work done at the Mount ...
E3 – Stellar distances
... spectroscopic parallax can be relied upon to measure the distance to a star. • When we observe another galaxy, all of the stars in that galaxy are approximately the same distance away from the earth. What we really need is a light source of known luminosity in the galaxy. If we had this then we coul ...
... spectroscopic parallax can be relied upon to measure the distance to a star. • When we observe another galaxy, all of the stars in that galaxy are approximately the same distance away from the earth. What we really need is a light source of known luminosity in the galaxy. If we had this then we coul ...
AST1100 Lecture Notes
... limit to be somewhere between 2 and 3 solar masses. If the collapsing core has a mass larger than about 3 solar masses, the gravitational forces will be higher than the neutron degeneration pressure. In this case, no known physical forces can withstand the forces of gravity and the core continues to ...
... limit to be somewhere between 2 and 3 solar masses. If the collapsing core has a mass larger than about 3 solar masses, the gravitational forces will be higher than the neutron degeneration pressure. In this case, no known physical forces can withstand the forces of gravity and the core continues to ...
The Sun
... to be stable. Earth's magnetic field reverses ~ every million years. The Sun's magnetic field is generated close to the surface. The magnetic field is dragged with the Sun's differential rotation, and it will wind up. ...
... to be stable. Earth's magnetic field reverses ~ every million years. The Sun's magnetic field is generated close to the surface. The magnetic field is dragged with the Sun's differential rotation, and it will wind up. ...
The Age Distribution of Potential Intelligent Life in the Milky Way
... released back to the interstellar gas. Many of the stars that explode as SNIa do so only at ages of a billion years or more (Sparke and Gallagher III, 2007). Alternatively, stars more massive than 8 M⊙ (Kennicutt, 1984) end their lives by exploding as Type II supernovae (SNII) and release mainly lig ...
... released back to the interstellar gas. Many of the stars that explode as SNIa do so only at ages of a billion years or more (Sparke and Gallagher III, 2007). Alternatively, stars more massive than 8 M⊙ (Kennicutt, 1984) end their lives by exploding as Type II supernovae (SNII) and release mainly lig ...
ph507weeks1
... Technological advances (including the Hubble Space Telescope) have improved parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the Euro ...
... Technological advances (including the Hubble Space Telescope) have improved parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the Euro ...
UCLA 2004
... When 1 Ori C goes supernova, all the disks in the Orion Nebula will be pelted with radioactive ejecta Even more true for the disks observed in Carina Nebula, with sixty O stars [Smith et al. (2003)], many other H II regions Ejecta dust grains penetrate disk, evaporate on entry, but leave SLRs lodg ...
... When 1 Ori C goes supernova, all the disks in the Orion Nebula will be pelted with radioactive ejecta Even more true for the disks observed in Carina Nebula, with sixty O stars [Smith et al. (2003)], many other H II regions Ejecta dust grains penetrate disk, evaporate on entry, but leave SLRs lodg ...
What units are used in astronomical photometry?
... typical it is 1”), it may seem strange that a stellar position can be determined to ±0.01” in one measurement; this accuracy is possible because we are determining the centre of the fuzzy stellar image. ...
... typical it is 1”), it may seem strange that a stellar position can be determined to ±0.01” in one measurement; this accuracy is possible because we are determining the centre of the fuzzy stellar image. ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... (1994) and Caron et al. (2003) noticed that this high number of RSGs was not accompanied by any blue supergiant. This proportion is at odds with what is generally found in Galactic open clusters, where blue supergiants outnumber RSGs by a factor ∼3 (Eggenberger et al. 2002). In recent years, several ...
... (1994) and Caron et al. (2003) noticed that this high number of RSGs was not accompanied by any blue supergiant. This proportion is at odds with what is generally found in Galactic open clusters, where blue supergiants outnumber RSGs by a factor ∼3 (Eggenberger et al. 2002). In recent years, several ...
MASSIVE CLOSE BINARIES
... sum of the distances between observed values and predicted ones was smallest (a linear regression where the slope of the line is fixed). This resulted in a shift of -0.2 which, accounting for the Z value of the Solar neighbourhood and of the LMC corresponds to ζ = ...
... sum of the distances between observed values and predicted ones was smallest (a linear regression where the slope of the line is fixed). This resulted in a shift of -0.2 which, accounting for the Z value of the Solar neighbourhood and of the LMC corresponds to ζ = ...
Red supergiants around the obscured open cluster Stephenson 2
... other RSG clusters is unclear. Though all the clusters are located at a similar distance and have similar ages, they span ∼500 pc in projection. There have been suggestions that this Scutum Complex represents a giant star formation region triggered by the dynamical excitation of the Galactic Bar, wh ...
... other RSG clusters is unclear. Though all the clusters are located at a similar distance and have similar ages, they span ∼500 pc in projection. There have been suggestions that this Scutum Complex represents a giant star formation region triggered by the dynamical excitation of the Galactic Bar, wh ...
Document
... Introduction Electric and Magnetic Fields Properties of Light o Review Questions (pg. 129/130) Production of Light o Continuous Spectrum o Discrete Spectrum Emission lines and absorption lines o Review Questions (pg. 133/134) ...
... Introduction Electric and Magnetic Fields Properties of Light o Review Questions (pg. 129/130) Production of Light o Continuous Spectrum o Discrete Spectrum Emission lines and absorption lines o Review Questions (pg. 133/134) ...
Journey through the cosmos
... to observe the sky. Among his discoveries, he found four moons moving around Jupiter so demonstrating that Earth was not the centre of all things as Aristotle and Ptolemy claimed. He was convinced that Earth moved around the Sun but he was arrested for promoting the model of Copernicus and, under th ...
... to observe the sky. Among his discoveries, he found four moons moving around Jupiter so demonstrating that Earth was not the centre of all things as Aristotle and Ptolemy claimed. He was convinced that Earth moved around the Sun but he was arrested for promoting the model of Copernicus and, under th ...
Open clusters in the Third Galactic Quadrant III. Alleged binary
... groups at different distances: Haffner 18(1) at 4.5 kpc and Haffner 18(2) between 9.5 and 11.4 kpc from the Sun. The derived distances and ages have been used to situate the clusters in the Galactic context. In particular, young stellar groups trace spiral structure at large Galactocentric radii. At le ...
... groups at different distances: Haffner 18(1) at 4.5 kpc and Haffner 18(2) between 9.5 and 11.4 kpc from the Sun. The derived distances and ages have been used to situate the clusters in the Galactic context. In particular, young stellar groups trace spiral structure at large Galactocentric radii. At le ...
structure and evolution of white dwarfs and their
... Under conditions of extreme pressure the electrons are forced to occupy space much closer to the nuclei of the constituent atoms than in normal matter, breaking down the quantised structure of the energy levels. However, according to the Pauli Exclusion Principle, no two electrons can occupy the sam ...
... Under conditions of extreme pressure the electrons are forced to occupy space much closer to the nuclei of the constituent atoms than in normal matter, breaking down the quantised structure of the energy levels. However, according to the Pauli Exclusion Principle, no two electrons can occupy the sam ...
Astronomy, Astrophysics, and Cosmology
... Luis A. Anchordoqui Department of Physics and Astronomy Lehman College, City University of New York ...
... Luis A. Anchordoqui Department of Physics and Astronomy Lehman College, City University of New York ...
An interesting nebular object in LDN 288
... A multiwavelength investigation of a star-forming region embedded in the dark cloud LDN 288 was carried out. There are several objects in this region: a B type star GSC 0625400181 surrounded by an HII region (object 2 in Fig.2), a star with a straight jet (object 3 in Fig.2), and a unique object SNO ...
... A multiwavelength investigation of a star-forming region embedded in the dark cloud LDN 288 was carried out. There are several objects in this region: a B type star GSC 0625400181 surrounded by an HII region (object 2 in Fig.2), a star with a straight jet (object 3 in Fig.2), and a unique object SNO ...
Physics of Star Formation: Milky Way and Beyond
... Galactic outflows are poorly understood although they are essential to feedback processes that quench star formation and limit the total mass of large galaxies. Thus, insufficient understanding of feedback associated with them - in particular molecular phase - is one of the greatest shortcomings in ...
... Galactic outflows are poorly understood although they are essential to feedback processes that quench star formation and limit the total mass of large galaxies. Thus, insufficient understanding of feedback associated with them - in particular molecular phase - is one of the greatest shortcomings in ...
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.