Hypervelocity Globular: A beacon of merging clusters Oleg Gnedin with Alexey Vikhlinin
... While measuring radial velocities of globular clusters around M87 in Virgo Cluster, Caldwell et al. (2014) found an outlier… A triple interaction with a binary black hole (slingshot) can lead to a very high ejection velocity. ...
... While measuring radial velocities of globular clusters around M87 in Virgo Cluster, Caldwell et al. (2014) found an outlier… A triple interaction with a binary black hole (slingshot) can lead to a very high ejection velocity. ...
Measuring the Stars Section 29.2
... While stars are in the main sequence, they are fusing hydrogen in their cores. As stars evolve off the main sequence, they begin to fuse helium in their cores and burn hydrogen around the core edges. ...
... While stars are in the main sequence, they are fusing hydrogen in their cores. As stars evolve off the main sequence, they begin to fuse helium in their cores and burn hydrogen around the core edges. ...
Summary of Astronomy
... Earth has aurora because it meets the two required conditions; it has a magnetic field (shaped like the one surrounding a bar magnet) and that magnetic field is struck by the solar wind, a stream of particles and gas from the sun. The interaction between the magnetic field and the solar wind creates ...
... Earth has aurora because it meets the two required conditions; it has a magnetic field (shaped like the one surrounding a bar magnet) and that magnetic field is struck by the solar wind, a stream of particles and gas from the sun. The interaction between the magnetic field and the solar wind creates ...
Influence of Opacity on the Pulsational Stability Of Massive Stars
... actual critical mass is probably 80-120 M 0' For homogeneous helium-burning stars, the critical mass ranges from 13 to 19 M 0, depending on the metal abundance. 1. INTRODUCTION ...
... actual critical mass is probably 80-120 M 0' For homogeneous helium-burning stars, the critical mass ranges from 13 to 19 M 0, depending on the metal abundance. 1. INTRODUCTION ...
Presentation in PDF format.
... O stars are always observed close to sites of current or recent star formation. Because of their high luminosities, O stars have very strong stellar winds, observed as asymmetric emission/absorption lines. Material is driven off the star at velocities of several hundred km s-1, with mass-loss rates ...
... O stars are always observed close to sites of current or recent star formation. Because of their high luminosities, O stars have very strong stellar winds, observed as asymmetric emission/absorption lines. Material is driven off the star at velocities of several hundred km s-1, with mass-loss rates ...
Chapters 12 and 13 Review: The Life Cycle and Death of Stars
... From Molecular Cloud to Protostar ...
... From Molecular Cloud to Protostar ...
Milky Way Galaxy Webquest
... 19. What is meant by dark matter? Why do astronomers conclude that the Milky Way contains dark ...
... 19. What is meant by dark matter? Why do astronomers conclude that the Milky Way contains dark ...
Basics – II. Time, Magnitudes and Spectral types
... BC should have two extra months and be 445 days long, to bring the calendar back in line with the seasons). In the short-term, this works well, but three years and one leap year give an average year of 365.25 days, different from the tropical year by about 0.0078 days, so in a thousand years, you’re ...
... BC should have two extra months and be 445 days long, to bring the calendar back in line with the seasons). In the short-term, this works well, but three years and one leap year give an average year of 365.25 days, different from the tropical year by about 0.0078 days, so in a thousand years, you’re ...
A historical perspective on the discovery of neutron stars
... Skyrme equation of state for high-density matter. He found that: nuclear forces considerably stiffen the EoS the maximum mass of neutron stars Mmax ≃ 2M⊙ is much higher than that found by Oppenheimer and Volkoff neutron stars can thus be formed as proposed by Baade and Zwicky neutron star cores may ...
... Skyrme equation of state for high-density matter. He found that: nuclear forces considerably stiffen the EoS the maximum mass of neutron stars Mmax ≃ 2M⊙ is much higher than that found by Oppenheimer and Volkoff neutron stars can thus be formed as proposed by Baade and Zwicky neutron star cores may ...
Planet Formation: Disk Formation and Evolution
... (iii) Magnetic support: Magnetic fields only affect charged particles in molecular clouds, making them follow field lines rather than obey gravity (or dragging the field along with them). The fields exert a magnetic force on the charged particles, which acts like a magnetic pressure. The magnetic pr ...
... (iii) Magnetic support: Magnetic fields only affect charged particles in molecular clouds, making them follow field lines rather than obey gravity (or dragging the field along with them). The fields exert a magnetic force on the charged particles, which acts like a magnetic pressure. The magnetic pr ...
Patterns in the Night Sky
... saw thousands of years ago, their component stars are not in exactly the same location as they were then. Precise observations of stars reveal that they move relative to each other in space, but these changes in position occur slowly, over many years. Since most stars are so far away from Earth, whe ...
... saw thousands of years ago, their component stars are not in exactly the same location as they were then. Precise observations of stars reveal that they move relative to each other in space, but these changes in position occur slowly, over many years. Since most stars are so far away from Earth, whe ...
Chapter 12 Pre-supernova evolution of massive stars
... Pre-supernova evolution of massive stars We have seen that low- and intermediate-mass stars (with masses up to ≈ 8 M⊙ ) develop carbonoxygen cores that become degenerate after central He burning. As a consequence the maximum core temperature reached in these stars is smaller than the temperature req ...
... Pre-supernova evolution of massive stars We have seen that low- and intermediate-mass stars (with masses up to ≈ 8 M⊙ ) develop carbonoxygen cores that become degenerate after central He burning. As a consequence the maximum core temperature reached in these stars is smaller than the temperature req ...
2 Galaxy morphology and classification
... The dark halo is the dark matter component that envelopes all galaxies. It extends well beyond the visible extents of the galaxy. The ,mass density decreases with radius roughly as where measurable. The nature of the particles that comprise this component is not known, but there is strong evidence t ...
... The dark halo is the dark matter component that envelopes all galaxies. It extends well beyond the visible extents of the galaxy. The ,mass density decreases with radius roughly as where measurable. The nature of the particles that comprise this component is not known, but there is strong evidence t ...
- saspcsus
... California Science Content Standards Addressed: Grade 3 Standards: 4. Objects in the sky move in regular and predictable patterns. As a basis for understanding this concept: A. Students know the patterns of stars stay the same, although they appear to move across the sky nightly, and different star ...
... California Science Content Standards Addressed: Grade 3 Standards: 4. Objects in the sky move in regular and predictable patterns. As a basis for understanding this concept: A. Students know the patterns of stars stay the same, although they appear to move across the sky nightly, and different star ...
here
... the wavelength. • The “lines” where there is relatively little light show up as dips in the curves. • These dips tell us about what elements are present in the star! ...
... the wavelength. • The “lines” where there is relatively little light show up as dips in the curves. • These dips tell us about what elements are present in the star! ...
Stars
... because of its high temperature—about 1 × 107 K in the center. At this temperature, all of the gases are completely ionized. This means that the interior is composed only of atomic nuclei and electrons, in the state of matter known as plasma. ...
... because of its high temperature—about 1 × 107 K in the center. At this temperature, all of the gases are completely ionized. This means that the interior is composed only of atomic nuclei and electrons, in the state of matter known as plasma. ...
ppt 3.8 Mb - Bogoliubov Laboratory of Theoretical Physics
... lower than the luminosities of all but one anomalous Xray pulsar. The properties of this pulsar prove that inferred dipolar magnetic field strength and period cannot alone be responsible for the unusual high-energy properties of the magnetars and create new challenges for understanding the possible ...
... lower than the luminosities of all but one anomalous Xray pulsar. The properties of this pulsar prove that inferred dipolar magnetic field strength and period cannot alone be responsible for the unusual high-energy properties of the magnetars and create new challenges for understanding the possible ...
New Mass Loss Measurements from Astrospheric Lyα Absorption
... such as the ionization fraction and magnetic field strength. The assumption of the same 400 km s⫺1 wind speed in all astrospheric models (akin to solar low-speed streams) is another major source of uncertainty, its justification being that one might expect similar wind speeds from stars with similar ...
... such as the ionization fraction and magnetic field strength. The assumption of the same 400 km s⫺1 wind speed in all astrospheric models (akin to solar low-speed streams) is another major source of uncertainty, its justification being that one might expect similar wind speeds from stars with similar ...
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.