Chapter 7 Formation of metal-enriched 2nd generation objects 7.1
... pressure-balanced with the IGM after metal has spread several hundred parsecs from the initial halo. Comparison of the leftmost and rightmost columns shows that metal has spread to at least the distance of the nearest neighboring halos, though it is unclear at present how much metal has managed to g ...
... pressure-balanced with the IGM after metal has spread several hundred parsecs from the initial halo. Comparison of the leftmost and rightmost columns shows that metal has spread to at least the distance of the nearest neighboring halos, though it is unclear at present how much metal has managed to g ...
Neutron Stars
... electrons are not in the lowest-energy level near the nucleus; instead they are arranged in higher-energy-level shells. ...
... electrons are not in the lowest-energy level near the nucleus; instead they are arranged in higher-energy-level shells. ...
Chapter 2 Surveying the stars 2.1 Star magnitudes
... which is the light energy per second per unit surface area received from the star at normal incidence on a surface. The intensity of sunlight at the Earth’s surface is about 1400 W m−2. In comparison, the intensity of light from the faintest star that can be seen with the unaided eye is more than a ...
... which is the light energy per second per unit surface area received from the star at normal incidence on a surface. The intensity of sunlight at the Earth’s surface is about 1400 W m−2. In comparison, the intensity of light from the faintest star that can be seen with the unaided eye is more than a ...
hwd_ewd_v3 - X-ray and Observational Astronomy Group
... spectra should be devoid of most elements, showing signatures of only hydrogen and, possibly, helium. White dwarfs are thus divided into two main groups according to whether or not their spectra are dominated by one or other of these elements. The hydrogen-rich stars are given the classification DA, ...
... spectra should be devoid of most elements, showing signatures of only hydrogen and, possibly, helium. White dwarfs are thus divided into two main groups according to whether or not their spectra are dominated by one or other of these elements. The hydrogen-rich stars are given the classification DA, ...
Spectral Classification: The First Step in Quantitative Spectral Analysis
... The MK Spectral type is a Fundamental Datum of Astronomy if • The spectral type is obtained solely through comparison with standards • Theory & external sources of information are not used in the determination of the spectral type If these two principles are followed, the spectral type can serve as ...
... The MK Spectral type is a Fundamental Datum of Astronomy if • The spectral type is obtained solely through comparison with standards • Theory & external sources of information are not used in the determination of the spectral type If these two principles are followed, the spectral type can serve as ...
Video Lesson Information Astronomy: Observations & Theories Astronomy 1
... Lesson 8 - The Family of Stars To determine how bright a star actually is, we need to know how far away it is. This lesson illustrates how to find distance to nearby stars and how to plot them on an H–R diagram. It also shows why binary stars are important for the study of stars and their mass–lumi ...
... Lesson 8 - The Family of Stars To determine how bright a star actually is, we need to know how far away it is. This lesson illustrates how to find distance to nearby stars and how to plot them on an H–R diagram. It also shows why binary stars are important for the study of stars and their mass–lumi ...
Solutions
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
Astronomy Assignment #1
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
... 4. During a night, how do the stars move? What angle does their nightly path make with respect to the horizon? How does it depend on latitude? During the course of a night the stars appear to move westward, rising somewhere along the eastern horizon (except for the circumpolar stars that never rise ...
A6 - Vicphysics
... them. These are generally matched to the relevant syllabus points although some comments and ideas are applicable across several sections of the syllabus. In addition to the material specifically targeting the Victorian VCE Physics syllabus material from two additional papers has been incorporated i ...
... them. These are generally matched to the relevant syllabus points although some comments and ideas are applicable across several sections of the syllabus. In addition to the material specifically targeting the Victorian VCE Physics syllabus material from two additional papers has been incorporated i ...
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 ...
Investigate Planets, Stars, Galaxies, and the Universe
... students create an illustrated text that explains either planets, stars, galaxies, or the observable universe. Encourage students to illustrate their essays with sketches or diagrams. (If your students participated in a jigsaw activity, have students select a class of object that they studied, and t ...
... students create an illustrated text that explains either planets, stars, galaxies, or the observable universe. Encourage students to illustrate their essays with sketches or diagrams. (If your students participated in a jigsaw activity, have students select a class of object that they studied, and t ...
Oxygen and Neon Abundances of B-Type Stars in Comparison with
... (1998) via the SIMBAD database. The resulting Teff and logg are summarized in table 1. Their typical errors may be estimated as 3% in Teff and 0.2 dex in logg for the present case of mid-through-late B stars, according to Napiwotzki, Schönberner, and Wenske (1993; cf. their section 5). The model ...
... (1998) via the SIMBAD database. The resulting Teff and logg are summarized in table 1. Their typical errors may be estimated as 3% in Teff and 0.2 dex in logg for the present case of mid-through-late B stars, according to Napiwotzki, Schönberner, and Wenske (1993; cf. their section 5). The model ...
norfolk skies - Norfolk Astronomical Society
... cluster, even in a small telescope, and it's magnificent in a larger one. It's known as NGC 2362. Now that was a year ago, so recently, while scanning through that same part of the sky, I decided to take another look at it. And, as I moved around in the general area of where it was supposed to be, I ...
... cluster, even in a small telescope, and it's magnificent in a larger one. It's known as NGC 2362. Now that was a year ago, so recently, while scanning through that same part of the sky, I decided to take another look at it. And, as I moved around in the general area of where it was supposed to be, I ...
2 Galaxy morphology and classification
... A bar (a radial density enhancement) may be present. The bar may terminate in a ring. Spiral arms often attach to the bar or ring. ...
... A bar (a radial density enhancement) may be present. The bar may terminate in a ring. Spiral arms often attach to the bar or ring. ...
ppt - NRAO
... E.g.: Taurus (of course), Orion is much larger than the Orion Nebula, It is not clear if all of Perseus is at the same distance (NGC1333 vs. IC 348), Ophiuchus streamers, etc.. (Note that these regions tend to be heavily obscured, so optical experiments are unlikely to improve significantly the situ ...
... E.g.: Taurus (of course), Orion is much larger than the Orion Nebula, It is not clear if all of Perseus is at the same distance (NGC1333 vs. IC 348), Ophiuchus streamers, etc.. (Note that these regions tend to be heavily obscured, so optical experiments are unlikely to improve significantly the situ ...
Dark Matter— More Than Meets The Eye
... dwarf stars too dim to be observed. Or they could be cold planet-like objects with masses about 1/1000 that of the sun. Or maxi- or mini- black holes. Or massive cold gas clouds. All these phenomena are baryonic. There is some observational evidence for the existence of MACHOs. Because they can warp ...
... dwarf stars too dim to be observed. Or they could be cold planet-like objects with masses about 1/1000 that of the sun. Or maxi- or mini- black holes. Or massive cold gas clouds. All these phenomena are baryonic. There is some observational evidence for the existence of MACHOs. Because they can warp ...
thick disk - asteroSTEP
... • Thick disks are very common. • In our Galaxy, the thick disk is old, and kinematically and chemically distinct from the thin disk. What does it represent in the galaxy formation process ? • The orbital eccentricity distribution will provide some guidance. • Chemical tagging will show if the thick ...
... • Thick disks are very common. • In our Galaxy, the thick disk is old, and kinematically and chemically distinct from the thin disk. What does it represent in the galaxy formation process ? • The orbital eccentricity distribution will provide some guidance. • Chemical tagging will show if the thick ...
Galaxy Formation and Evolution
... Since galaxies are observed over cosmological length and time scales, the description of their formation and evolution must involve cosmology, the study of the properties of space-time on large scales. Modern cosmology is based upon the Cosmological Principle, the hypothesis that the Universe is spa ...
... Since galaxies are observed over cosmological length and time scales, the description of their formation and evolution must involve cosmology, the study of the properties of space-time on large scales. Modern cosmology is based upon the Cosmological Principle, the hypothesis that the Universe is spa ...
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.