The Solar System and Beyond
... Objective 1: Compare the size and distance of objects within systems in the universe. c. Compare the size of the Solar System to the size of the Milky Way galaxy. ...
... Objective 1: Compare the size and distance of objects within systems in the universe. c. Compare the size of the Solar System to the size of the Milky Way galaxy. ...
Structure of Neutron Stars
... The closest millisecond PSR. MNS=1.76+/-0.2 solar. Hopefully, this value will not be reconsidered. 2. The case of PSR J0751+1807. Initially, it was announced that it has a mass ~2.1 solar [astro-ph/0508050]. However, then in 2007 at a conference the authors announced that the result was incorrect. A ...
... The closest millisecond PSR. MNS=1.76+/-0.2 solar. Hopefully, this value will not be reconsidered. 2. The case of PSR J0751+1807. Initially, it was announced that it has a mass ~2.1 solar [astro-ph/0508050]. However, then in 2007 at a conference the authors announced that the result was incorrect. A ...
Abundance Anomalies In Tidal Disruption Events
... Figure 1 shows that low mass stars simply live too long to develop abundance anomalies given the age of the universe. Over its main sequence life time, an 0.5M⊙ star becomes significantly enhanced in helium and nitrogen and depleted in carbon, but 10 Gyr represents less than 10% of its overall lifet ...
... Figure 1 shows that low mass stars simply live too long to develop abundance anomalies given the age of the universe. Over its main sequence life time, an 0.5M⊙ star becomes significantly enhanced in helium and nitrogen and depleted in carbon, but 10 Gyr represents less than 10% of its overall lifet ...
The importance of episodic accretion for low
... Hubeny 1990). The gas is assumed to be a mixture of hydrogen (70%) and helium (30%) , with an equation of state (Black & Bodenheimer 1975) that accounts (i) for the rotational and vibrational degrees of freedom of molecular hydrogen, and (ii) for the different chemical states of hydrogen and helium. ...
... Hubeny 1990). The gas is assumed to be a mixture of hydrogen (70%) and helium (30%) , with an equation of state (Black & Bodenheimer 1975) that accounts (i) for the rotational and vibrational degrees of freedom of molecular hydrogen, and (ii) for the different chemical states of hydrogen and helium. ...
Targets for Small Telescopes
... ly, which compares to the Orion Nebula spanning 40 ly. The Star Cluster at the Centre of the Nebula (also NGC 2070), spans 250 light years. If the nebula were contained within our own Galaxy it would fill the entire constellation of Orion (30 degrees of sky) and darkness as we know it, would not exi ...
... ly, which compares to the Orion Nebula spanning 40 ly. The Star Cluster at the Centre of the Nebula (also NGC 2070), spans 250 light years. If the nebula were contained within our own Galaxy it would fill the entire constellation of Orion (30 degrees of sky) and darkness as we know it, would not exi ...
presentation source
... •If large enough, the Black Hole could swallow entire stars and grow very massive, maybe millions of MO •If galaxy massive enough, or through encounters with other galaxies, could grow even more massive •As galaxy ages, available mass drops and activity diminishes ...
... •If large enough, the Black Hole could swallow entire stars and grow very massive, maybe millions of MO •If galaxy massive enough, or through encounters with other galaxies, could grow even more massive •As galaxy ages, available mass drops and activity diminishes ...
Astronomical Distance Determination • etc.
... •Then their individual stars and globular clusters, that are really much further away look too faint and too small. ...
... •Then their individual stars and globular clusters, that are really much further away look too faint and too small. ...
A model of low-mass neutron stars with a quark core
... mass and radius, respectively). Also given here is the packing factor α. For all critical configurations, this quantity is positive and (except for configuration f ) of the same order of magnitude as for white dwarfs. Figure 2 shows a plot of matter density ρ against coordinate r (1) for configuration ...
... mass and radius, respectively). Also given here is the packing factor α. For all critical configurations, this quantity is positive and (except for configuration f ) of the same order of magnitude as for white dwarfs. Figure 2 shows a plot of matter density ρ against coordinate r (1) for configuration ...
5 Great Facts of Life - Westside Church of Christ
... Big Dipper, for example, are members of a nearby star cluster roughly 75 light-years away. Their light takes a human lifetime to reach Earth. Nestled between the constellations Perseus and Cassiopeia lies a twin cluster of stars-the Double Cluster. Their light travels for 7,000 years before it reach ...
... Big Dipper, for example, are members of a nearby star cluster roughly 75 light-years away. Their light takes a human lifetime to reach Earth. Nestled between the constellations Perseus and Cassiopeia lies a twin cluster of stars-the Double Cluster. Their light travels for 7,000 years before it reach ...
Red Supergiants as Cosmic Abundance Probes
... with effective temperatures around 4000 K, and so their spectra are dominated by absorption from thousands of molecular lines. Historically this has meant that high spectral resolving powers were needed to study individual lines, making these stars unsuitable for extragalactic work due to the large ...
... with effective temperatures around 4000 K, and so their spectra are dominated by absorption from thousands of molecular lines. Historically this has meant that high spectral resolving powers were needed to study individual lines, making these stars unsuitable for extragalactic work due to the large ...
The chemical case for no winds in dwarf irregular galaxies
... recent observations (e.g. Dunn 2010) indicate that dEs/dSphs and dIrrs constitute two structurally distinct populations. In this work, we focus our attention on the evolution of isolated gas-rich dwarf galaxies, not affected by external environmental processes. One of the agents that may regulate th ...
... recent observations (e.g. Dunn 2010) indicate that dEs/dSphs and dIrrs constitute two structurally distinct populations. In this work, we focus our attention on the evolution of isolated gas-rich dwarf galaxies, not affected by external environmental processes. One of the agents that may regulate th ...
kd - The HST Treasury Program on Eta Carinae
... …The photosphere is therefore prolate as sketched in Fig. 1, with Teff ~ 14000 K near the poles but Teff > 20000 K near the equator. Some details may eventually prove inaccurate, but this is currently the “best bet” picture in view of existing evidence. (Caveat: The axial ratio shown here is plausib ...
... …The photosphere is therefore prolate as sketched in Fig. 1, with Teff ~ 14000 K near the poles but Teff > 20000 K near the equator. Some details may eventually prove inaccurate, but this is currently the “best bet” picture in view of existing evidence. (Caveat: The axial ratio shown here is plausib ...
Introduction to Stars: Their Properties
... Which stars are the brightest? Which stars are putting out the most watts? (luminosity = energy per second) NEED TO KNOW: ...
... Which stars are the brightest? Which stars are putting out the most watts? (luminosity = energy per second) NEED TO KNOW: ...
Slide 1
... Magnitude is the degree of brightness of a star. In 1856, British astronomer Norman Pogson proposed a quantitative scale of stellar magnitudes, which was adopted by the astronomical community. Each increment in magnitude corresponds to an increase in the amount of energy by 2.512, approximately. A f ...
... Magnitude is the degree of brightness of a star. In 1856, British astronomer Norman Pogson proposed a quantitative scale of stellar magnitudes, which was adopted by the astronomical community. Each increment in magnitude corresponds to an increase in the amount of energy by 2.512, approximately. A f ...
Close-by young isolated neutron stars (and black holes)
... Recently, Rutledge et al. reported the discovery of an enigmatic NS candidated dubbed Calvera. It can be an evolved (aged) version of Cas A source, but also it can be a M7-like object, who’s progenitor was a runaway (or, less probably, hypervelocity) star. ...
... Recently, Rutledge et al. reported the discovery of an enigmatic NS candidated dubbed Calvera. It can be an evolved (aged) version of Cas A source, but also it can be a M7-like object, who’s progenitor was a runaway (or, less probably, hypervelocity) star. ...
Fate of Stars
... • Usually leaves neutron star For high mass stars • Fusion continues beyond C,O • Core of degenerate electrons builds up - opposes gravity • If Mass(core) > 1.4 M(Sun) core collapses in SUPERNOVA (II) • Leaves either Neutron Star or Black Hole PHYS 162 ...
... • Usually leaves neutron star For high mass stars • Fusion continues beyond C,O • Core of degenerate electrons builds up - opposes gravity • If Mass(core) > 1.4 M(Sun) core collapses in SUPERNOVA (II) • Leaves either Neutron Star or Black Hole PHYS 162 ...
October 2014 - Hermanus Astronomy
... be, so this is where our simulations come in,” said Celine Boehm from Durham University. “By tuning the strength of the scattering of particles, we change the number of small galaxies, which lets us learn more about the physics of dark matter and how it might interact with other particles in the uni ...
... be, so this is where our simulations come in,” said Celine Boehm from Durham University. “By tuning the strength of the scattering of particles, we change the number of small galaxies, which lets us learn more about the physics of dark matter and how it might interact with other particles in the uni ...
A Study of the Spectroscopic Variability of Select RV Tauri... Charles Kurgatt , Donald K. Walter , Steve Howell
... causes such as eclipses, stellar rotation, and pulsation. The two types studied here vary in brightness due to pulsations in the physical size of the stars. RV Tauri are distinguished by light curves that alternate over time between deep and shallow minima, possibly due to multiple pulsations of dif ...
... causes such as eclipses, stellar rotation, and pulsation. The two types studied here vary in brightness due to pulsations in the physical size of the stars. RV Tauri are distinguished by light curves that alternate over time between deep and shallow minima, possibly due to multiple pulsations of dif ...
Unit 3 - Section 9.1 2011 Distances in Space
... direction that C appears from two ends of a baseline AB (see illustration). The problem is simplified by three ideas. 1. The baseline is perpendicular (i.e., 90O) to a line draw from the middle of AB to point C. Thus, the triangle ABC is symmetric. If we call the drawn line r, then AC = BC = r 2. Th ...
... direction that C appears from two ends of a baseline AB (see illustration). The problem is simplified by three ideas. 1. The baseline is perpendicular (i.e., 90O) to a line draw from the middle of AB to point C. Thus, the triangle ABC is symmetric. If we call the drawn line r, then AC = BC = r 2. Th ...
Grade 9 Academic Science – Unit 3 Space
... direction that C appears from two ends of a baseline AB (see illustration). The problem is simplified by three ideas. 1. The baseline is perpendicular (i.e., 90O) to a line draw from the middle of AB to point C. Thus, the triangle ABC is symmetric. If we call the drawn line r, then AC = BC = r 2. Th ...
... direction that C appears from two ends of a baseline AB (see illustration). The problem is simplified by three ideas. 1. The baseline is perpendicular (i.e., 90O) to a line draw from the middle of AB to point C. Thus, the triangle ABC is symmetric. If we call the drawn line r, then AC = BC = r 2. Th ...
Constellations - Sierra Star Gazers
... is also known as the Cygnus Loop. Composed of NGC 6960, 6992 and 6995, this large collection of nebulosity is the result of a supernova explosion about 2,500 light years distant that occurred some 15,000 years ago. This type II supernova marked the final chapter in the life of a supergiant star with ...
... is also known as the Cygnus Loop. Composed of NGC 6960, 6992 and 6995, this large collection of nebulosity is the result of a supernova explosion about 2,500 light years distant that occurred some 15,000 years ago. This type II supernova marked the final chapter in the life of a supergiant star with ...
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.