Stellar populations
... ASTR112 The Galaxy Lecture 3 The cluster turn-off point • This is the (B-V) colour index of bluest mainsequence stars, and corresponds to most massive stars still on M-S (core hydrogen-burning stage). ...
... ASTR112 The Galaxy Lecture 3 The cluster turn-off point • This is the (B-V) colour index of bluest mainsequence stars, and corresponds to most massive stars still on M-S (core hydrogen-burning stage). ...
OGU - What`s Out Tonight?
... A second type of galaxy is the spiral, which resembles its name. The galaxy that we live in, the Milky Way Galaxy, is a spiral. Spirals are flatter looking, like a dish. They have round bulged centers out of which curved arms radiate. Spirals often have lots of gas and dust in their arms from which ...
... A second type of galaxy is the spiral, which resembles its name. The galaxy that we live in, the Milky Way Galaxy, is a spiral. Spirals are flatter looking, like a dish. They have round bulged centers out of which curved arms radiate. Spirals often have lots of gas and dust in their arms from which ...
PPT presentation
... A survey for PNs in this elliptical galaxy produced 535 detections (Mendez et al. 2001, ApJ, 563, 135). In addition, some 20 objects of different kinds were found, namely: • Many extended sources, presumably star formation regions at low redshift. Those pose no confusion problem because of their ext ...
... A survey for PNs in this elliptical galaxy produced 535 detections (Mendez et al. 2001, ApJ, 563, 135). In addition, some 20 objects of different kinds were found, namely: • Many extended sources, presumably star formation regions at low redshift. Those pose no confusion problem because of their ext ...
Other burning stages - Michigan State University
... • This state then immediately decays under alpha emission into 8Be • Which immediately decays into 2 alpha particles So they saw after the delay of the b-decay 3 alpha particles coming from their target after a few ms of irradiation This proved that the state can also be formed by the 3 alpha proces ...
... • This state then immediately decays under alpha emission into 8Be • Which immediately decays into 2 alpha particles So they saw after the delay of the b-decay 3 alpha particles coming from their target after a few ms of irradiation This proved that the state can also be formed by the 3 alpha proces ...
Can We Successfully Apply A Solar Thin-Flux
... At all latitudes, leading spots rotate 0.6% faster than followers. Young groups expand rapidly, while old groups contract slowly. ...
... At all latitudes, leading spots rotate 0.6% faster than followers. Young groups expand rapidly, while old groups contract slowly. ...
Fast-Moving Structures in the Debris Disk Around AU Microscopii
... in 2010. However, all structures identified in 2014 appear to have moved away from the star toward the southeast direction as a coherent train of patterns. From these measurements, we derived the projected speeds of each feature (Figure 3). The motions are faster (>4–11 km/s) than those expected for ...
... in 2010. However, all structures identified in 2014 appear to have moved away from the star toward the southeast direction as a coherent train of patterns. From these measurements, we derived the projected speeds of each feature (Figure 3). The motions are faster (>4–11 km/s) than those expected for ...
Where Does Helium Come from?
... more important because it comprises the vast majority of density in the universe which holds our galaxies together but scientists have found very little evidence beyond theory. In the period between 10−35 and 10−4 s after the Big Bang, the heavier elementary particles such as protons and neutrons, a ...
... more important because it comprises the vast majority of density in the universe which holds our galaxies together but scientists have found very little evidence beyond theory. In the period between 10−35 and 10−4 s after the Big Bang, the heavier elementary particles such as protons and neutrons, a ...
![Cosmic variance in [O/Fe] in the Galactic disk](http://s1.studyres.com/store/data/014331057_1-996ec6eddf93071c5e835624d4620c7e-300x300.png)
Walk Softly When Exploring the Dark Side of the Universe Karl Gebhardt
... Advanced Computing Center) and the 5800 (called Lonestar) and 60,000 ...
... Advanced Computing Center) and the 5800 (called Lonestar) and 60,000 ...
The Association of Dust Disks and Planets Lynne Hillenbrand (Caltech) P.I.
... younger stars can pose a challenge to precision Doppler work due to the enhanced starspot and plage magnetic activity of their photospheres that causes a velocity “jitter”, acting as noise in the Doppler measurements. For FGK stars there is decreasing jitter towards later spectral types (e.g. Santos ...
... younger stars can pose a challenge to precision Doppler work due to the enhanced starspot and plage magnetic activity of their photospheres that causes a velocity “jitter”, acting as noise in the Doppler measurements. For FGK stars there is decreasing jitter towards later spectral types (e.g. Santos ...
Stellar Atmospheres
... LTE vs. non-LTE • non-LTE (NLTE) – any state that departs from LTE (usually it means that populations of some selected energy levels of some selected atoms/ions are allowed to depart from their LTE value, but velocity distributions of all particles are assumed to be Maxwellian, with the same kineti ...
... LTE vs. non-LTE • non-LTE (NLTE) – any state that departs from LTE (usually it means that populations of some selected energy levels of some selected atoms/ions are allowed to depart from their LTE value, but velocity distributions of all particles are assumed to be Maxwellian, with the same kineti ...
AST1100 Lecture Notes
... neutrinos very difficult to detect and therefore a source of information with limited usefulness until better detection methods are discovered. 4. gravitational waves: spacetime distortions traveling through space as a wave. These are predicted by Einstein’s general theory of relativity. Gravitation ...
... neutrinos very difficult to detect and therefore a source of information with limited usefulness until better detection methods are discovered. 4. gravitational waves: spacetime distortions traveling through space as a wave. These are predicted by Einstein’s general theory of relativity. Gravitation ...
l~ JHd 111
... aeeretion dise of hot gas whieh surrounds the white dwarf. This dise and espeeially its "hot spot"-Le. the plaee where the gas stream from the red eomponent falls onto the dise-are the most prominent light sources of the entire system. This model resembles that of the X-ray binaries, but the masses ...
... aeeretion dise of hot gas whieh surrounds the white dwarf. This dise and espeeially its "hot spot"-Le. the plaee where the gas stream from the red eomponent falls onto the dise-are the most prominent light sources of the entire system. This model resembles that of the X-ray binaries, but the masses ...
Word format
... Knowledge of the gas-grain interaction is important for understanding the rich chemistry of dense molecular clouds in the interstellar medium (ISM). For example, the gas phase production of H2 from hydrogen atoms is not efficient enough to account for the observed abundance of molecular hydrogen. Th ...
... Knowledge of the gas-grain interaction is important for understanding the rich chemistry of dense molecular clouds in the interstellar medium (ISM). For example, the gas phase production of H2 from hydrogen atoms is not efficient enough to account for the observed abundance of molecular hydrogen. Th ...
E3 – Stellar distances
... spectroscopic parallax can be relied upon to measure the distance to a star. • When we observe another galaxy, all of the stars in that galaxy are approximately the same distance away from the earth. What we really need is a light source of known luminosity in the galaxy. If we had this then we coul ...
... spectroscopic parallax can be relied upon to measure the distance to a star. • When we observe another galaxy, all of the stars in that galaxy are approximately the same distance away from the earth. What we really need is a light source of known luminosity in the galaxy. If we had this then we coul ...
The Life of the Sun
... Fraser: That’s just what I was going to ask – how long does this last? Pamela: Our Sun hangs out on the Main Sequence for a few billion years – like 10ish billion years. Then it only spends a few hundred millions years going through all the rest of the stages. So those are relatively short stages in ...
... Fraser: That’s just what I was going to ask – how long does this last? Pamela: Our Sun hangs out on the Main Sequence for a few billion years – like 10ish billion years. Then it only spends a few hundred millions years going through all the rest of the stages. So those are relatively short stages in ...
ASTRO-114--Lecture 37-
... beginning our discussion on stars, by talking about our star the Sun. We are now going to shift to all the other stars and so we’re now moving out of the solar system to the rest of the universe. Keep in mind, if you’re trying to visualize an average star, the Sun will do fine. So we have already be ...
... beginning our discussion on stars, by talking about our star the Sun. We are now going to shift to all the other stars and so we’re now moving out of the solar system to the rest of the universe. Keep in mind, if you’re trying to visualize an average star, the Sun will do fine. So we have already be ...
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.