A Study of the Spiral Galaxy M101 Elizabeth City State University
... show examples of each type. Galaxies have an enormous range in mass and size as indicated in Table 1. Galaxies are separated by vast gulfs of space. For example, our own Milky Way is over 160,000 light years away from its nearest extragalactic neighbor, the Large Magellanic Cloud. Despite these larg ...
... show examples of each type. Galaxies have an enormous range in mass and size as indicated in Table 1. Galaxies are separated by vast gulfs of space. For example, our own Milky Way is over 160,000 light years away from its nearest extragalactic neighbor, the Large Magellanic Cloud. Despite these larg ...
Lecture 2 ppt - Physics 1025 Introductory Astronomy
... 2. So we know the star will transit 1 hour before or after 10 PM. Since the star is east of the meridian, it hasn’t yet transited. (all stars rise in the east and set in the west as time passes) West East Therefore, the star will transit in one hour: ...
... 2. So we know the star will transit 1 hour before or after 10 PM. Since the star is east of the meridian, it hasn’t yet transited. (all stars rise in the east and set in the west as time passes) West East Therefore, the star will transit in one hour: ...
Star formation in galaxies over the last 10 billion
... Astronomers can look back in time: light from very distant galaxies took billions of years to reach us. Looking far is looking back ...
... Astronomers can look back in time: light from very distant galaxies took billions of years to reach us. Looking far is looking back ...
Galaxy Structure
... smaller group of three large and over 30 small galaxies, and is the second largest (after the Andromeda Galaxy M31) but perhaps the most massive member of this group. The Milky Way is most likely a BARRED SPIRAL GALAXY of Hubble type SBc. We are situated within the outer regions of its spiral disk, ...
... smaller group of three large and over 30 small galaxies, and is the second largest (after the Andromeda Galaxy M31) but perhaps the most massive member of this group. The Milky Way is most likely a BARRED SPIRAL GALAXY of Hubble type SBc. We are situated within the outer regions of its spiral disk, ...
Evolution of Warm Debris Around Sun-like Stars: Clues to Terrestrial
... Our main result is that 10-100 Myr appears to be the preferred epoch for the generation of 24 micron debris excess around sun-like stars. Studies of extinct radio-active nuclides suggest that the Earth-Moon system was formed about 30 Myr after the formation of the Sun. This is also consistent with n ...
... Our main result is that 10-100 Myr appears to be the preferred epoch for the generation of 24 micron debris excess around sun-like stars. Studies of extinct radio-active nuclides suggest that the Earth-Moon system was formed about 30 Myr after the formation of the Sun. This is also consistent with n ...
The Perseid Meteor Shower
... the sky in a few seconds, comets travel slowly across the night sky. You would have to watch one for hours or days to see its movement. Comets leave behind dust that causes meteors. When lots of meteors fall one after another, we call it a "meteor shower." A meteor shower is worth watching. Perseid ...
... the sky in a few seconds, comets travel slowly across the night sky. You would have to watch one for hours or days to see its movement. Comets leave behind dust that causes meteors. When lots of meteors fall one after another, we call it a "meteor shower." A meteor shower is worth watching. Perseid ...
powerpoint - High Energy Physics at Wayne State
... Astronomy is a Time Machine When we observe a star that is 100 light-years distant, then the light took 100 years to reach us. We are seeing it as it was 100 years ago. The nearest galaxy is about a million light-years from Earth. We see it as it was 1 million years ago. The most distant objects ob ...
... Astronomy is a Time Machine When we observe a star that is 100 light-years distant, then the light took 100 years to reach us. We are seeing it as it was 100 years ago. The nearest galaxy is about a million light-years from Earth. We see it as it was 1 million years ago. The most distant objects ob ...
1 Pau Amaro Seoane - modest 15-s
... the Universe. With typical masses of 107 to 108 solar masses and half-mass radii between 10 to 100 pc they are more than a factor 1000 denser than dwarf galaxies of the same mass. They also show evidence for elevated mass-to-light ratios, which could be due to the presence of massive black holes or ...
... the Universe. With typical masses of 107 to 108 solar masses and half-mass radii between 10 to 100 pc they are more than a factor 1000 denser than dwarf galaxies of the same mass. They also show evidence for elevated mass-to-light ratios, which could be due to the presence of massive black holes or ...
Night Sky Observations
... Greenwich Mean Time / Universal Time: The local time at the 0 meridian passing through Greenwich, England; it is the same everywhere, anytime! South African Standard Time: GMT +2 hours. If the GMT is 15h00, SAST will be 17h00. Constellation: A pattern of stars connected with imaginary lines to form ...
... Greenwich Mean Time / Universal Time: The local time at the 0 meridian passing through Greenwich, England; it is the same everywhere, anytime! South African Standard Time: GMT +2 hours. If the GMT is 15h00, SAST will be 17h00. Constellation: A pattern of stars connected with imaginary lines to form ...
PHYS3380_111615_bw - The University of Texas at Dallas
... (recurrent nova) MWD=1.50.2M MMS=0.90.2M 2. White dwarf + red giant: the initially more massive star becomes white dwarf . The lower mass companion (~1-2M) evolves into red giant. Mass transferred to white dwarf . Such systems are well known to produce novae. But mass transfer must be at just t ...
... (recurrent nova) MWD=1.50.2M MMS=0.90.2M 2. White dwarf + red giant: the initially more massive star becomes white dwarf . The lower mass companion (~1-2M) evolves into red giant. Mass transferred to white dwarf . Such systems are well known to produce novae. But mass transfer must be at just t ...
AST1100 Lecture Notes
... This will continue until the core consists of iron 56 26 Fe. We learned in the lecture on nuclear reactions that in order to produce elements heavier than iron, energy needs to be added, no energy is released. For elements heavier than iron, the mass per nucleon increases when the number of nucleons ...
... This will continue until the core consists of iron 56 26 Fe. We learned in the lecture on nuclear reactions that in order to produce elements heavier than iron, energy needs to be added, no energy is released. For elements heavier than iron, the mass per nucleon increases when the number of nucleons ...
AST1100 Lecture Notes
... This will continue until the core consists of iron 56 26 Fe. We learned in the lecture on nuclear reactions that in order to produce elements heavier than iron, energy needs to be added, no energy is released. For elements heavier than iron, the mass per nucleon increases when the number of nucleons ...
... This will continue until the core consists of iron 56 26 Fe. We learned in the lecture on nuclear reactions that in order to produce elements heavier than iron, energy needs to be added, no energy is released. For elements heavier than iron, the mass per nucleon increases when the number of nucleons ...
X-ray binaries
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
X-ray binaries
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
11-Massive Stars
... are expected to be extremely eruptive phenomena during which accretion disks should not be able to survive and, therefore, any resulting outflows are likely to be less collimated and rather appear more like explosions. Many well-studied massive outflows have complex structures. A wide distribution o ...
... are expected to be extremely eruptive phenomena during which accretion disks should not be able to survive and, therefore, any resulting outflows are likely to be less collimated and rather appear more like explosions. Many well-studied massive outflows have complex structures. A wide distribution o ...
1 Introduction - University of Amsterdam
... Massive stars (8−12 M and up; Poelarends et al. 2008) end their lives as corecollapse supernovae (CCSNe). They are powerful cosmic engines that strongly impact their immediate surroundings (e.g., Douglas et al. 2010). Their intense ionizing radiation, stellar winds, chemical processing, and energet ...
... Massive stars (8−12 M and up; Poelarends et al. 2008) end their lives as corecollapse supernovae (CCSNe). They are powerful cosmic engines that strongly impact their immediate surroundings (e.g., Douglas et al. 2010). Their intense ionizing radiation, stellar winds, chemical processing, and energet ...
Annual report 2004 - Département d`Astrophysique, Géophysique et
... the Scuti star XX Pyx. Applying a cross-correlation technique to the spectra, we found clear radialvelocity variations with a large amplitude. We derive the orbital parameters and confirm an orbital period of 1.15d, as suggested previously on the basis of photometric variations. The amplitude of the ...
... the Scuti star XX Pyx. Applying a cross-correlation technique to the spectra, we found clear radialvelocity variations with a large amplitude. We derive the orbital parameters and confirm an orbital period of 1.15d, as suggested previously on the basis of photometric variations. The amplitude of the ...
Determination of kinetic energies of stars using Hipparcos data *
... has resulted in kind of a U-turn of the astronomical community towards stellar kinematics. This is not surprising, in view of the fact that the previous peak of the amount of works devoted to stellar kinematics was in 1930s when the General Catalogue by B. Boss became available (Boss, B. 1937). The ...
... has resulted in kind of a U-turn of the astronomical community towards stellar kinematics. This is not surprising, in view of the fact that the previous peak of the amount of works devoted to stellar kinematics was in 1930s when the General Catalogue by B. Boss became available (Boss, B. 1937). The ...
Document
... mass density of the universe has roughly doubled since z ~ 1…Intriguingly, the integrated stellar mass of blue galaxies with young stars has not significantly changed since z ~ 1…instead, the growth of the total stellar mass density is dominated by the growth of the total mass in the largely passive ...
... mass density of the universe has roughly doubled since z ~ 1…Intriguingly, the integrated stellar mass of blue galaxies with young stars has not significantly changed since z ~ 1…instead, the growth of the total stellar mass density is dominated by the growth of the total mass in the largely passive ...
The Antares Emission Nebula and Mass Loss of α Sco A
... The Antares nebula has been known as a peculiar [Fe II] emission nebula, apparently without normal H II region lines. Long-slit VLT/UVES mapping shows that it is an H II region 3 in size around the B type star A Sco B, with a Balmer line recombination spectrum and [N II] lines, but no [O II] and [O ...
... The Antares nebula has been known as a peculiar [Fe II] emission nebula, apparently without normal H II region lines. Long-slit VLT/UVES mapping shows that it is an H II region 3 in size around the B type star A Sco B, with a Balmer line recombination spectrum and [N II] lines, but no [O II] and [O ...
Neutron Stars
... Periods shorter than this do not exist (such as in the previous calculation) because the object would have to rotate so fast it would overcome gravity and fly apart. ...
... Periods shorter than this do not exist (such as in the previous calculation) because the object would have to rotate so fast it would overcome gravity and fly apart. ...
15.1 Introduction
... and UV spectra are dominated by strong, broad emission lines instead of the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 1867 by... Charles Wolf and Georges Rayet (!) using the 40 cm Foucault teles ...
... and UV spectra are dominated by strong, broad emission lines instead of the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 1867 by... Charles Wolf and Georges Rayet (!) using the 40 cm Foucault teles ...
Does size matter (in the SFRs)?
... the same locations of the graph, and have very similar values of the SFRs. On the contrary of course, UGC 5296 is not the only quiescent galaxy in the Universe, but the caveat is that 2/3 of the 18 galaxies we have observed common among the are quiescent. As they were selected because of their small ...
... the same locations of the graph, and have very similar values of the SFRs. On the contrary of course, UGC 5296 is not the only quiescent galaxy in the Universe, but the caveat is that 2/3 of the 18 galaxies we have observed common among the are quiescent. As they were selected because of their small ...
6 The mysterious universe
... This nuclear fusion reaction in stars Nebula in the constellation of Orion is a nebula large releases vast amounts of energy. enough to be seen with the naked eye. The collapse continues under the influence of gravity, forming visible globules in the nebula cloud. As the globules collapse further, t ...
... This nuclear fusion reaction in stars Nebula in the constellation of Orion is a nebula large releases vast amounts of energy. enough to be seen with the naked eye. The collapse continues under the influence of gravity, forming visible globules in the nebula cloud. As the globules collapse further, t ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.