PPT Only - Harvard-Smithsonian Center for Astrophysics
... highlights the extreme depletion seen at high extinctions in C18O emission (Lada et al. 2001). The inset on the bottom right panel shows the extinction map derived from applying the NICER method applied to NTT near-infrared observations of the most extinguished portion of B68. The graph in the botto ...
... highlights the extreme depletion seen at high extinctions in C18O emission (Lada et al. 2001). The inset on the bottom right panel shows the extinction map derived from applying the NICER method applied to NTT near-infrared observations of the most extinguished portion of B68. The graph in the botto ...
Molecular Clouds and the Onset of Star Formation
... P.H. Bodenheimer, Principles of Star Formation, Astronomy and Astrophysics Library, ...
... P.H. Bodenheimer, Principles of Star Formation, Astronomy and Astrophysics Library, ...
Astronomy and Survey of Information
... • In pairs where the two stars are of equal brightness, they are also of the same spectral type. • In systems where the brightnesses are different, the fainter star is bluer if the brighter star is a giant star, and redder if the brighter star belongs to the main sequence. • Since mass can be determ ...
... • In pairs where the two stars are of equal brightness, they are also of the same spectral type. • In systems where the brightnesses are different, the fainter star is bluer if the brighter star is a giant star, and redder if the brighter star belongs to the main sequence. • Since mass can be determ ...
Prime Focus - Tri-City Astronomy Club
... times smaller than that of Jupiter. "Failed-Jupiter planets, like OGLE-2005-BLG-169Lb, are predicted to be more common than Jupiters, especially around stars less massive than the sun, according to the preferred theory of planet formation. So this type of planet is thought to be quite common," Benne ...
... times smaller than that of Jupiter. "Failed-Jupiter planets, like OGLE-2005-BLG-169Lb, are predicted to be more common than Jupiters, especially around stars less massive than the sun, according to the preferred theory of planet formation. So this type of planet is thought to be quite common," Benne ...
Master Page
... Really, really dark. There are no major cities around to pollute the area with light. On a clear night in Sutherland the sky is better than any TV show. You can see thousands of stars, yes, even without a telescope. Constellations that most of us who live in cities never ever see, even though they a ...
... Really, really dark. There are no major cities around to pollute the area with light. On a clear night in Sutherland the sky is better than any TV show. You can see thousands of stars, yes, even without a telescope. Constellations that most of us who live in cities never ever see, even though they a ...
Dust and molecular gas in the most distant quasars
... host galaxies of the strong millimeter detected quasars at z~6. – Star formation rate: ≥103 Msun yr-1. – Star formation efficiency: comparable to ULIRGs and SMGs. • Gas mass: ~1010 Msun, which will turn to stars via the massive starburst. • If the quasar systems at z~6 follow the local black hole-bu ...
... host galaxies of the strong millimeter detected quasars at z~6. – Star formation rate: ≥103 Msun yr-1. – Star formation efficiency: comparable to ULIRGs and SMGs. • Gas mass: ~1010 Msun, which will turn to stars via the massive starburst. • If the quasar systems at z~6 follow the local black hole-bu ...
Document
... interstellar matter, allows the Blandford–Znajeck mechanism to be activated. So, electron–positron jets can be launched. Such jets are feasible electron accelerator which, in molecular clouds, allows electron energy to be boosted up to ~1 PeV. These sources can contribute both to the population of u ...
... interstellar matter, allows the Blandford–Znajeck mechanism to be activated. So, electron–positron jets can be launched. Such jets are feasible electron accelerator which, in molecular clouds, allows electron energy to be boosted up to ~1 PeV. These sources can contribute both to the population of u ...
Document
... interstellar matter, allows the Blandford–Znajeck mechanism to be activated. So, electron–positron jets can be launched. Such jets are feasible electron accelerator which, in molecular clouds, allows electron energy to be boosted up to ~1 PeV. These sources can contribute both to the population of u ...
... interstellar matter, allows the Blandford–Znajeck mechanism to be activated. So, electron–positron jets can be launched. Such jets are feasible electron accelerator which, in molecular clouds, allows electron energy to be boosted up to ~1 PeV. These sources can contribute both to the population of u ...
Young Galaxies Grow - Astronomical Society of the Pacific
... M83 in three views: in visible light, in GALEX’s UV image, and with radio emission added to illustrate the distribution of its extended disk of low-density gas where the new young stars were found. Credits: R. Gendler/NASA/JPL-Caltech/NRAO/ AUI/NSF/MPIA. ...
... M83 in three views: in visible light, in GALEX’s UV image, and with radio emission added to illustrate the distribution of its extended disk of low-density gas where the new young stars were found. Credits: R. Gendler/NASA/JPL-Caltech/NRAO/ AUI/NSF/MPIA. ...
Almost nothing - NRC Publications Archive
... compression. However, eventually it does collapse. The electrons are pushed right into the nucleus, where they combine with the protons to make neutrons. So we end up with a very small, extremely heavy lump of neutrons. The core of a star compressed to this point would be a few kilometres in diamete ...
... compression. However, eventually it does collapse. The electrons are pushed right into the nucleus, where they combine with the protons to make neutrons. So we end up with a very small, extremely heavy lump of neutrons. The core of a star compressed to this point would be a few kilometres in diamete ...
Dark Matter: Observational Constraints Properties of Dark Matter:
... • This much HI is easily observed in the 21-cm line of atomic hydrogen • Hot, X-ray emitting gas is observed to be insufficient • Warm, 104 K ionized gas emits by bremstrahlung. If in hydrostatic equilibrium, central regions would be dense enough to be easily observed. • Molecular gas must be H2; la ...
... • This much HI is easily observed in the 21-cm line of atomic hydrogen • Hot, X-ray emitting gas is observed to be insufficient • Warm, 104 K ionized gas emits by bremstrahlung. If in hydrostatic equilibrium, central regions would be dense enough to be easily observed. • Molecular gas must be H2; la ...
The Local Bubble
... tween 10 –10 K. While the amount of OVI in the LB has been measured fairly accurately MyrSect. of evolution due to inhomogeneous medium 3), the source of the soft X-ray emission isambient more elusive. First of all, it is more dif• Develop internal structures after ~8(see ficult to localize, as ther ...
... tween 10 –10 K. While the amount of OVI in the LB has been measured fairly accurately MyrSect. of evolution due to inhomogeneous medium 3), the source of the soft X-ray emission isambient more elusive. First of all, it is more dif• Develop internal structures after ~8(see ficult to localize, as ther ...
Document
... thus, at a certain point, the newly forming object becomes visible. At this stage the large luminous body is called a protostar. The other half of its gravitational energy remains within the protostar as heat. As contraction continues, the internal temperature of the protostar keeps rising, and when ...
... thus, at a certain point, the newly forming object becomes visible. At this stage the large luminous body is called a protostar. The other half of its gravitational energy remains within the protostar as heat. As contraction continues, the internal temperature of the protostar keeps rising, and when ...
Lesson Overviews and Content Standards
... make a scale model of time rather than distance. The lifetimes of different masses of stars are compared to each other and to the geologic timeline for the Earth. Students then make predictions about what classes of main sequence stars might have planets with interesting life forms (as defined by th ...
... make a scale model of time rather than distance. The lifetimes of different masses of stars are compared to each other and to the geologic timeline for the Earth. Students then make predictions about what classes of main sequence stars might have planets with interesting life forms (as defined by th ...
VISIT TO NORMAN LOCKYER OBSERVATORY IN SIDMOUTH
... The stars of the Plough, shown linked by the thicker lines in the chart above, form one of the most recognised star patterns in the sky. Also called the Big Dipper, after the soup ladles used by farmer's wives in America to serve soup to the farm workers at lunchtime, it forms part of the Great Bear ...
... The stars of the Plough, shown linked by the thicker lines in the chart above, form one of the most recognised star patterns in the sky. Also called the Big Dipper, after the soup ladles used by farmer's wives in America to serve soup to the farm workers at lunchtime, it forms part of the Great Bear ...
REACH FOR THE STARS MLK 2009
... What causes a sun like star to suddenly contract in diameter? ___________________________________ How many times will a blue giant orbit the center of the Milky Way during its life? ________________ Where are globular clusters typically found in a galaxy? ___________________ Approximately what % of ...
... What causes a sun like star to suddenly contract in diameter? ___________________________________ How many times will a blue giant orbit the center of the Milky Way during its life? ________________ Where are globular clusters typically found in a galaxy? ___________________ Approximately what % of ...
PowerPoint Presentation - Neutron stars, pulsars and black holes
... than 100 times per second (the first was spinning 640 times per second) threw the field for a loop. When some millisecond pulsars were discovered in old star clusters it was even more confusing. • Eventually it was determined that all millisecond pulsars were in close binary systems and were `spun u ...
... than 100 times per second (the first was spinning 640 times per second) threw the field for a loop. When some millisecond pulsars were discovered in old star clusters it was even more confusing. • Eventually it was determined that all millisecond pulsars were in close binary systems and were `spun u ...
Stellar Activity
... • M dwarfs are relatively bright x-ray sources • Corona extends as much as a stellar radius above the photosphere • Temperatures up to a few million degrees • Coronal emission primarily in soft x-rays (0.1-1 KeV), collisionally excited emission lines of high ionization states of Fe and other heavy e ...
... • M dwarfs are relatively bright x-ray sources • Corona extends as much as a stellar radius above the photosphere • Temperatures up to a few million degrees • Coronal emission primarily in soft x-rays (0.1-1 KeV), collisionally excited emission lines of high ionization states of Fe and other heavy e ...
Spatial distribution of stars in the Milky Way
... Most stars are MS dwarfs and hence such a relation is not very surprising. Contamination due to giant stars starts to become important at (V-I) ~ 2.3, which for dwarfs on the main sequence, this corresponds to MV ~ 6.5 mag. So their analysis can be plagued with errors at those (and fainter) absolute ...
... Most stars are MS dwarfs and hence such a relation is not very surprising. Contamination due to giant stars starts to become important at (V-I) ~ 2.3, which for dwarfs on the main sequence, this corresponds to MV ~ 6.5 mag. So their analysis can be plagued with errors at those (and fainter) absolute ...
Solar System where_are_we
... beautiful spiral galaxy Messier 74 was used, as it thought to be a similar galaxy to ours. ...
... beautiful spiral galaxy Messier 74 was used, as it thought to be a similar galaxy to ours. ...
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.