The Spiral Structure of the Milky Way
... Mapping The Spiral Arms Of The Milky Way Starting point: Map the intensity of neutral hydrogen along the Galactic plane for various Galactic longitudes. As a result of this procedure, it has been shown that the neutral hydrogen appears to be concentrated in the spiral arms of the Milky Way. ...
... Mapping The Spiral Arms Of The Milky Way Starting point: Map the intensity of neutral hydrogen along the Galactic plane for various Galactic longitudes. As a result of this procedure, it has been shown that the neutral hydrogen appears to be concentrated in the spiral arms of the Milky Way. ...
X-ray effects on protoplanetary disks
... X-ray flares are strong and ubiquitous in pre-main sequence stars throughout the planet formation era • Elevated X-ray flaring seen in thousands of PMS stars in dozens of star forming regions. 28 < log Lx < 32 erg/s. • For 1 MO stars, flares are ~102 more luminous and ~102 more frequent than in con ...
... X-ray flares are strong and ubiquitous in pre-main sequence stars throughout the planet formation era • Elevated X-ray flaring seen in thousands of PMS stars in dozens of star forming regions. 28 < log Lx < 32 erg/s. • For 1 MO stars, flares are ~102 more luminous and ~102 more frequent than in con ...
Pictures in the Stars, Legends in the Sky
... supergiant star in the Milky Way galaxy. Its diameter is about 700 times larger than our sun! If Antares replaced our sun in the center of our solar system, it would extend past the orbit of Mars! ...
... supergiant star in the Milky Way galaxy. Its diameter is about 700 times larger than our sun! If Antares replaced our sun in the center of our solar system, it would extend past the orbit of Mars! ...
The mystery of cosmic oceans and dunes Earth
... Tokyo, February 17, 2015: Simulations by researchers at Tokyo Institute of Technology and Tsinghua University indicate that Earth-like planets are more likely to be found orbiting Sun-like stars rather than lower-mass stars that are currently targeted, in terms of water contents of planets. The sear ...
... Tokyo, February 17, 2015: Simulations by researchers at Tokyo Institute of Technology and Tsinghua University indicate that Earth-like planets are more likely to be found orbiting Sun-like stars rather than lower-mass stars that are currently targeted, in terms of water contents of planets. The sear ...
The Origin of Light
... into discovering such a unified theory acceptable to all. For the next 300,000 years there was a gradual cooling until, when the temperature reached about 30,000°, electrons were slow enough to be captured by nucleons to form neutral atoms – the negative charge on the electron balancing that of the ...
... into discovering such a unified theory acceptable to all. For the next 300,000 years there was a gradual cooling until, when the temperature reached about 30,000°, electrons were slow enough to be captured by nucleons to form neutral atoms – the negative charge on the electron balancing that of the ...
PSC100 Summary Chapters 10 to Chapter 20
... learned in lesson 3 that the light from these distant points can be carefully analyzed to give us much more information than just the brightness and spatial location of the stars. A few of the light sources that can be seen in the night sky have a "fuzzy structure" that was the subject of great myst ...
... learned in lesson 3 that the light from these distant points can be carefully analyzed to give us much more information than just the brightness and spatial location of the stars. A few of the light sources that can be seen in the night sky have a "fuzzy structure" that was the subject of great myst ...
Long-Time Data Storage: Relevant Time Scales
... ice, no matter how old, would be a sensation, even more so if it were not of human origin. This fact constitutes a strong argument in support of storing data on human kind for a very long time. Modern data storage media faithfully conserve information for not much more than a mere 10 years. The VCR ...
... ice, no matter how old, would be a sensation, even more so if it were not of human origin. This fact constitutes a strong argument in support of storing data on human kind for a very long time. Modern data storage media faithfully conserve information for not much more than a mere 10 years. The VCR ...
Full PDF
... Quasars are the most luminous, powerful and energetic objects in the universe. They inhabit the center of active young galaxies and emit up to a thousand times the energy output of the Milky Way.4 Quasars have a very high redshift, which is a result of the expansion of the universe. The implication ...
... Quasars are the most luminous, powerful and energetic objects in the universe. They inhabit the center of active young galaxies and emit up to a thousand times the energy output of the Milky Way.4 Quasars have a very high redshift, which is a result of the expansion of the universe. The implication ...
Announcements Homework. Final Exam. Isotropy of the CMB
... • Almost no further radiation from stars. • Cold, dark universe. • But… • Occasional collisions between brown dwarfs Î new low-mass stars (10 to 100 in existence per galaxy at any given time). • Occasional collisions of degenerate stars Î supernova. ...
... • Almost no further radiation from stars. • Cold, dark universe. • But… • Occasional collisions between brown dwarfs Î new low-mass stars (10 to 100 in existence per galaxy at any given time). • Occasional collisions of degenerate stars Î supernova. ...
On the nature and detectability of Type Ib/c supernova progenitors
... rates for which the effect of wind clumping was not considered (cf. Hamann & Koesterke 1998). As a consequence, the evolutionary tracks of their WR star models have surface temperatures of log T ≃ 4.8, and Maund et al. applied their BCs accordingly only up to the quoted value. However, the stellar t ...
... rates for which the effect of wind clumping was not considered (cf. Hamann & Koesterke 1998). As a consequence, the evolutionary tracks of their WR star models have surface temperatures of log T ≃ 4.8, and Maund et al. applied their BCs accordingly only up to the quoted value. However, the stellar t ...
Gravitational Waves – detectors, sources & science
... • Many have been detected with radio telescopes, e.g., Crab Pulsar. Wide range of rotation frequencies – ~1 Hz –> 1 kHz. • The surface of a neutron star may be bumpy, e.g., from fluid motions or crustal deformation. • Rapid rotation ensures such “mountainous” neutron stars emit GWs at twice the rota ...
... • Many have been detected with radio telescopes, e.g., Crab Pulsar. Wide range of rotation frequencies – ~1 Hz –> 1 kHz. • The surface of a neutron star may be bumpy, e.g., from fluid motions or crustal deformation. • Rapid rotation ensures such “mountainous” neutron stars emit GWs at twice the rota ...
ppt - CIERA-Northwestern
... We study the evolution of binary stars in globular clusters using a new Monte Carlo approach combining a population synthesis code (STARTRACK) and a simple treatment of dynamical interactions in the dense cluster core using a new tool for computing three- and four-body interactions (FEWBODY). We fin ...
... We study the evolution of binary stars in globular clusters using a new Monte Carlo approach combining a population synthesis code (STARTRACK) and a simple treatment of dynamical interactions in the dense cluster core using a new tool for computing three- and four-body interactions (FEWBODY). We fin ...
ph507rev1
... The UBV system has been extended into the red and infrared (in part because of the development of new detectors, such as CCDs, sensitive to this region of the spectrum). The extensions are not as well standardised as that for the Johnson UBV system, but they tend to include R and I in the far red an ...
... The UBV system has been extended into the red and infrared (in part because of the development of new detectors, such as CCDs, sensitive to this region of the spectrum). The extensions are not as well standardised as that for the Johnson UBV system, but they tend to include R and I in the far red an ...
Open cluster intro
... The observational data indicate that all stars form in clusters. In a cloud of hydrogen gas, laced with helium and a trace of other elements, something triggers a collapse. Stars form with a range of different masses and begin their lives. Over time, the gravitational pull of the parent galaxy will ...
... The observational data indicate that all stars form in clusters. In a cloud of hydrogen gas, laced with helium and a trace of other elements, something triggers a collapse. Stars form with a range of different masses and begin their lives. Over time, the gravitational pull of the parent galaxy will ...
INTERSTELLAR MedLab
... Reflection – dust clouds that reflect (scatter) a star’s light to us Dark – high densities of dust and gas that redden or extinct the light from the stars located behind the cloud. These are also where molecules are likely to be found. During the course of this laboratory exercise, you will study th ...
... Reflection – dust clouds that reflect (scatter) a star’s light to us Dark – high densities of dust and gas that redden or extinct the light from the stars located behind the cloud. These are also where molecules are likely to be found. During the course of this laboratory exercise, you will study th ...
ASTRO 1050 The Structure of the Milky Way Galaxy
... halo, a larger cloud of stars that surround the entire Galaxy. The halo is much larger than the bulge. Our Milky Way Galaxy is made up of mostly stars, gas and dust. The dust blocks out light from distant stars, and makes it difficult to see most of the Galaxy, especially the bulge and parts of the ...
... halo, a larger cloud of stars that surround the entire Galaxy. The halo is much larger than the bulge. Our Milky Way Galaxy is made up of mostly stars, gas and dust. The dust blocks out light from distant stars, and makes it difficult to see most of the Galaxy, especially the bulge and parts of the ...
Photometry
... measured for other pairs of filters. • The U-B measurement brackets the Balmer line at 364 nm. – Opaque at shorter wavelength • This creates a discontinuity in energy measurement. – Greatest at type A – Drop off for B and G ...
... measured for other pairs of filters. • The U-B measurement brackets the Balmer line at 364 nm. – Opaque at shorter wavelength • This creates a discontinuity in energy measurement. – Greatest at type A – Drop off for B and G ...
The density of very massive evolved galaxies to z≃ 1.7
... 105 Mpc3 . Given the stellar masses of the seven early types, the resulting mass density is ρ star = (2.3 ± 0.9) × 107 M Mpc−3 . Such densities are likely to be lower limits because of the incompleteness of our spectroscopic observations (13 spectra collected out of the 19 EROs in the field). In or ...
... 105 Mpc3 . Given the stellar masses of the seven early types, the resulting mass density is ρ star = (2.3 ± 0.9) × 107 M Mpc−3 . Such densities are likely to be lower limits because of the incompleteness of our spectroscopic observations (13 spectra collected out of the 19 EROs in the field). In or ...
1B11 Foundations of Astronomy Star names and magnitudes
... [email protected] www.ucl.ac.uk/webct www.mssl.ucl.ac.uk/ ...
... [email protected] www.ucl.ac.uk/webct www.mssl.ucl.ac.uk/ ...
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.