Characteristics of Stars - Laconia School District
... • How do astronomers measure distance to the stars? • Astronomers use a method called parallax. Because of the Earth's revolution about the sun, near stars seem to shift their position against the farther stars. The smaller the parallax shift, the farther away from earth the star is. This method is ...
... • How do astronomers measure distance to the stars? • Astronomers use a method called parallax. Because of the Earth's revolution about the sun, near stars seem to shift their position against the farther stars. The smaller the parallax shift, the farther away from earth the star is. This method is ...
arXiv:0712.2297v1 [astro
... stars later than K5. Clearly, more observations are needed to understand the nature of the scatter, part of which may be contributed by short-period pulsations, which remain unresolved by the sparse sampling of our survey. Searches for planets around evolved stars are still in their infancy compared ...
... stars later than K5. Clearly, more observations are needed to understand the nature of the scatter, part of which may be contributed by short-period pulsations, which remain unresolved by the sparse sampling of our survey. Searches for planets around evolved stars are still in their infancy compared ...
Linking Asteroids and Meteorites through Reflectance
... • The bulge is at the center of the galaxy, is a flattened spheroid • This is a high density region where red stars predominate, which are very old and about 10 billion years old • There is growing evidence for a very massive black hole at its center ...
... • The bulge is at the center of the galaxy, is a flattened spheroid • This is a high density region where red stars predominate, which are very old and about 10 billion years old • There is growing evidence for a very massive black hole at its center ...
Internal heat production in hot Jupiter exo
... National Laboratory, USA, yielded fission-product helium, as shown in Figure 1, with isotopic compositions within the exact range of compositions typically observed in oceanic basalts14,15. For additional information, see Rao16. At the pressures which exist near the centre of the earth, density beco ...
... National Laboratory, USA, yielded fission-product helium, as shown in Figure 1, with isotopic compositions within the exact range of compositions typically observed in oceanic basalts14,15. For additional information, see Rao16. At the pressures which exist near the centre of the earth, density beco ...
REGIONAL exam 2013
... G. Exotic source of hard x-rays associated with massive O and B type stars; flare ups are brief and show very fast rise times ...
... G. Exotic source of hard x-rays associated with massive O and B type stars; flare ups are brief and show very fast rise times ...
Lecture 10: Stellar Evolution
... 1044 erg s-1 - thus supernova same as energy radiated by the entire galaxy in 9 years. ...
... 1044 erg s-1 - thus supernova same as energy radiated by the entire galaxy in 9 years. ...
Lectures 7
... velocity structure and chemical composition of the gas. • Photoionization: photon from source eject electron from ion- to do this photon needs to have energy greater than ionization potential (e.g. 13.6 eV for Hydrogen; O,B stars, AGN) • Collisional ionization: gas is excited by collisions with 'hot ...
... velocity structure and chemical composition of the gas. • Photoionization: photon from source eject electron from ion- to do this photon needs to have energy greater than ionization potential (e.g. 13.6 eV for Hydrogen; O,B stars, AGN) • Collisional ionization: gas is excited by collisions with 'hot ...
Constants and Equations
... 37) Suppose that the mass of Sirius B is 0.98 M☉, and the semi-major axis between Sirius A is 7.5 arcsec observed from Earth, and that we are viewing the system face-on, please calculate the period for the Sirius system to complete one orbit in years. ...
... 37) Suppose that the mass of Sirius B is 0.98 M☉, and the semi-major axis between Sirius A is 7.5 arcsec observed from Earth, and that we are viewing the system face-on, please calculate the period for the Sirius system to complete one orbit in years. ...
Document
... Galaxy, but for the vast majority, the separation of the stars is large enough that one star doesn’t affect the evolution of the other(s). ...
... Galaxy, but for the vast majority, the separation of the stars is large enough that one star doesn’t affect the evolution of the other(s). ...
life cycles of stars
... Helium fusion does not begin right away because it requires higher temperatures than hydrogen fusion—larger charge leads to greater repulsion Fusion of two helium nuclei doesn’t work, so helium fusion must combine three He nuclei to make carbon ...
... Helium fusion does not begin right away because it requires higher temperatures than hydrogen fusion—larger charge leads to greater repulsion Fusion of two helium nuclei doesn’t work, so helium fusion must combine three He nuclei to make carbon ...
Dark Matter - UW - Laramie, Wyoming | University of Wyoming
... Hot Gas in Clusters of Galaxies Space between galaxies is not empty, but filled with hot gas (observable in X rays) ...
... Hot Gas in Clusters of Galaxies Space between galaxies is not empty, but filled with hot gas (observable in X rays) ...
Teaching Text Structure with Understanding the Scale of the Universe
... of stars, glowing gas, or something unknown. Hubble’s photograph showed that the Andromeda Galaxy was made of individual stars, and he even found stars of the type that Henrietta Swan Leavitt had studied. He was able to calculate that the Andromeda Galaxy is much more distant and ...
... of stars, glowing gas, or something unknown. Hubble’s photograph showed that the Andromeda Galaxy was made of individual stars, and he even found stars of the type that Henrietta Swan Leavitt had studied. He was able to calculate that the Andromeda Galaxy is much more distant and ...
Deep fields around bright stars (“Galaxies around Stars”)
... It is less sensitive to the shift of the rest frame wavelength (UV is observed in the optical) The average redshift of flux-limited samples is higher than in B. Need to center the fields around 12-13 mag. stars! Best efficiency in K and H. ...
... It is less sensitive to the shift of the rest frame wavelength (UV is observed in the optical) The average redshift of flux-limited samples is higher than in B. Need to center the fields around 12-13 mag. stars! Best efficiency in K and H. ...
canopus e.g procyon
... Most of these are visible to the unaided eye. Note the presence of the Hyades cluster. ...
... Most of these are visible to the unaided eye. Note the presence of the Hyades cluster. ...
Reprint
... The gas and dust from planetary nebulae eventually disperse into the diffuse interstellar medium, enriching this material with heavy elements. In our galaxy, planetary nebulae supply almost an order of magnitude more interstellar mass than supernovae (e.g., Stanghellini et al. 2000). The fate of the ...
... The gas and dust from planetary nebulae eventually disperse into the diffuse interstellar medium, enriching this material with heavy elements. In our galaxy, planetary nebulae supply almost an order of magnitude more interstellar mass than supernovae (e.g., Stanghellini et al. 2000). The fate of the ...
File
... Life After Death for White Dwarfs • Recurring novae occur in binary systems. The dwarf’s gravitational field pulls matter (hydrogen & helium) from the surface of a main sequence or giant companion star. The stolen gas builds up on the surface of the white dwarf and becomes hotter & denser, eventu ...
... Life After Death for White Dwarfs • Recurring novae occur in binary systems. The dwarf’s gravitational field pulls matter (hydrogen & helium) from the surface of a main sequence or giant companion star. The stolen gas builds up on the surface of the white dwarf and becomes hotter & denser, eventu ...
Make Your Own Star Bracelet
... layers of gas, leaving a small core that shines out radio waves as the stars rotate very fast. Astronomers did no know about these stars until they became using radio telescopes in the 1960s. Because they appear to pulse out radio waves as they spin, the are sometimes called pulsars. (pick up the bl ...
... layers of gas, leaving a small core that shines out radio waves as the stars rotate very fast. Astronomers did no know about these stars until they became using radio telescopes in the 1960s. Because they appear to pulse out radio waves as they spin, the are sometimes called pulsars. (pick up the bl ...
Scientists discover surprising importance of `I Love Q` for
... "Getting a paper accepted into 'Science' is very knowing the details of their internal structure. difficult," Yunes said. "It's a great honor to be accepted. This encourages us to continue working These relations – described in Yunes and Yagi's hard to make new, important discoveries." paper titled ...
... "Getting a paper accepted into 'Science' is very knowing the details of their internal structure. difficult," Yunes said. "It's a great honor to be accepted. This encourages us to continue working These relations – described in Yunes and Yagi's hard to make new, important discoveries." paper titled ...
–1– 28. HIGH-MASS STAR FORMATION: THEORY 28.1. The Effects
... mass range, however, which suggests that competitive accretion does not determine the IMF at lower masses either. Second, competitive accretion is effective only if the virial parameter is much less than observed, as discussed in Lecture 24. The most radical and imaginative model for the formation o ...
... mass range, however, which suggests that competitive accretion does not determine the IMF at lower masses either. Second, competitive accretion is effective only if the virial parameter is much less than observed, as discussed in Lecture 24. The most radical and imaginative model for the formation o ...
PPTX
... 3D space. Shapes are specific to Earth's present location in galaxy. • Fainter stars don't participate in pattern • Constellations are transient because stars are all moving with respect to each other. • Used as convenient "address" for roughly locating objects in sky. ...
... 3D space. Shapes are specific to Earth's present location in galaxy. • Fainter stars don't participate in pattern • Constellations are transient because stars are all moving with respect to each other. • Used as convenient "address" for roughly locating objects in sky. ...
The Ultraluminous X-ray Source in Holmberg IX and its Environment
... We identify the optical counterpart to be a 22.8 mag blue star (MV = −5.0) belonging to a small stellar cluster. From isochrone fitting of our multi-colour photometry we determine a cluster age of some 60 Myr. We also discovered strong stellar HeIIλ4686 emission (equivalent width of 10 Å) which prov ...
... We identify the optical counterpart to be a 22.8 mag blue star (MV = −5.0) belonging to a small stellar cluster. From isochrone fitting of our multi-colour photometry we determine a cluster age of some 60 Myr. We also discovered strong stellar HeIIλ4686 emission (equivalent width of 10 Å) which prov ...
Iron does not burn.
... spin (i.e., anti-parallel). The energy state of an electron spinning anti-parallel is slightly lower than the energy state of a parallel-spin electron. Remember that the atom always wants to be in the lowest energy state possible, so the electron will eventually flip to the antiparallel spin directi ...
... spin (i.e., anti-parallel). The energy state of an electron spinning anti-parallel is slightly lower than the energy state of a parallel-spin electron. Remember that the atom always wants to be in the lowest energy state possible, so the electron will eventually flip to the antiparallel spin directi ...
Slide 1
... the hydrogen lines are weak. Both HeI and HeII (singly ionized helium) are seen in the higher temperature examples. The radiation from O5 stars is so intense that it can ionize hydrogen over a volume of space 1000 light years across. One example is the luminous H II region surrounding star cluster M ...
... the hydrogen lines are weak. Both HeI and HeII (singly ionized helium) are seen in the higher temperature examples. The radiation from O5 stars is so intense that it can ionize hydrogen over a volume of space 1000 light years across. One example is the luminous H II region surrounding star cluster M ...
Properties of stars: temperature, colour index and equivalent width
... Liceo Scientifico “Enrico Fermi, Padova ...
... Liceo Scientifico “Enrico Fermi, Padova ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.